Research activity information

• Weak coupling of observed surface PM2.5 in Delhi-NCR with rice crop residue burning in Punjab and Haryana

  Poonam Mangaraj, Yutaka Matsumi, Tomoki Nakayama, Akash Biswal, Kazuyo Yamaji, Hikaru Araki, Natsuko Yasutomi, Masayuki Takigawa, Prabir K. Patra, Sachiko Hayashida, Akanksha Sharma, A. P. Dimri, Surendra K. Dhaka, Manpreet S. Bhatti, Mizuo Kajino, Sahil Mor, Ravindra Khaiwal, Sanjeev Bhardwaj, Vimal J. Vazhathara, Ravi K. Kunchala, Tuhin K. Mandal, Prakhar Misra, Tanbir Singh, Kamal Vatta, Suman Mor

  Springer Science and Business Media LLC, Jan. 2025, npj Climate and Atmospheric Science, 8(1) (1)

  [Refereed]

  Scientific journal


• Downward and upward revisions of Chinese emissions of black carbon and CO in bottom-up inventories are still required: an integrated analysis of WRF/CMAQ model and EMeRGe observations in East Asia in spring 2018

  Phuc Thi Minh Ha, Yugo Kanaya, Kazuyo Yamaji, Syuichi Itahashi, Satoru Chatani, Takashi Sekiya, Maria Dolores Andrés Hernández, John Philip Burrows, Hans Schlager, Michael Lichtenstern, Mira Poehlker, Bruna Holanda

  Nov. 2024


• Impact of post monsoon crop residue burning on PM_2.5 over North India: Optimizing emissions using a high-density in situ surface observation network

  Mizuo Kajino, Kentaro Ishijima, Joseph Ching, Kazuyo Yamaji, Rio Ishikawa, Tomoki Kajikawa, Tanbir Singh, Tomoki Nakayama, Yutaka Matsumi, Koyo Kojima, Prabir K. Patra, Sachiko Hayashida

  Abstract. The impact of post monsoon crop residue burning (CRB) on surface PM2.5 concentrations over the Punjab–Haryana–Delhi (PHD) region in North India was investigated using a regional meteorology–chemistry model, NHM-Chem, and a high-density in situ surface observation network comprising Compact and Useful PM2.5 Instrument with Gas Sensors (CUPI-G) stations. We optimized CRB emissions from November 1 to 15, 2022 using NHM-Chem and surface PM2.5 observational data. The CUPI-G data from Punjab was found to be crucial for CRB emission optimization, as the CRB emissions in North India in October and November are predominantly originating from Punjab, accounting for 80 %. The new emission inventory is referred to as OFEv1.0, with 12 h time resolution, in daytime (5:30–17:30 IST) and nighttime (17:30–5:30 IST). The total emissions in OFEv1.0, such as PM2.5, organic carbon, and black carbon, were consistent with previous studies, except CO, which was overestimated. OFEv1.0 substantially boosted emissions, which were underestimated in satellite data due to clouds or thick haze on November 8 and 10, 2022. Large differences in optimized daytime and nighttime emissions indicated the importance of diurnal variations. Daytime emissions were larger than nighttime emissions on some days but not on others, indicating that diurnal variation shape may have differed each day. The mean contribution of CRB to surface PM2.5 over PHD was 30 %–34 %, which increased to 50 %–56 % during plume events that transported pollutants from Punjab, to Haryana, to Delhi. Due to low performance of the meteorological simulation on November 8 and 9, 2022, emission optimization was not successful in the case of increased PM2.5 concentrations observed in Haryana on these days. The results of this study were obtained using a single transport model. Multi-model analysis is indispensable for better predictions and quantification of uncertainties in prediction results.

  Copernicus GmbH, Oct. 2024


• Controlling factors of spatiotemporal variations in black carbon concentrations over the Arctic region by using a WRF/CMAQ simulation on the Northern Hemisphere scale

  Kyoma Yahara, Kazuyo Yamaji, Fumikazu Taketani, Masayuki Takigawa, Yugo Kanaya, Sho Ohata, Yutaka Kondo, Makoto Koike

  Black carbon (BC) aerosol, released into the atmosphere from fuel combustion and biomass burning, is known to be an important short-lived climate forcer (SLCF) because it efficiently absorbs solar radiation and directly heats the atmosphere. Because its accumulation on snow and ice promotes their melting, BC is an important driver of warming, particularly in the Arctic region. Observed surface BC concentrations in the Arctic region show typical seasonal variations, increasing during the winter and spring and decreasing during the warmer season with some peak events in few months of summer, along with large interannual variations. The present study investigates the primary factors influencing the differences in the spatiotemporal surface concentrations of BC in the Arctic region by performing a hemispheric-scale air-quality simulation for the years 2015 and 2016. The model reasonably simulates the observed BC concentration levels and their seasonal patterns, as well as their differences between these two years. This study shows that large year-to-year variability in BC-rich air-mass pathways, such as long-range transport from surrounding regions, and besides these air-mass stagnation within the Arctic region, influence the differences in the Arctic BC concentrations between 2015 and 2016. In addition, the Arctic BC concentrations were also controlled by interannual variations in the amount and distribution of emissions due to the size and the location of open fires, including both Asian crop residue burning in spring and boreal forest fires in summer.

  Corresponding, ELSEVIER, Sep. 2024, Polar Science, 41, English

  [Refereed]

  Scientific journal


• Very high particulate pollution over northwest India captured by a high-density in situ sensor network

  Singh, T, Y. Matsumi, T. Nakayama, S. Hayashida, P. K. Patra, N. Yasutomi, M. Kajino, K. Yamaji, P. Khatri, M. Takigawa, H. Araki, Y. Kurogi, K. Kuji, K. Muramatsu, R. Imasu, A. Ananda, A. A. Arbain, R. Khaiwal, S. Bhardwaj, S. Kumar, S. Mor, S. K. Dhaka, A. P. Dimri, A. Sharma, N. Singh, M. S. Bhatti, R. Yadav, K. Vatta, S. Mo

  Abstract Exposure to particulate matter less than 2.5 µm in diameter (PM_2.5) is a cause of concern in cities and major emission regions of northern India. An intensive field campaign involving the states of Punjab, Haryana and Delhi national capital region (NCR) was conducted in 2022 using 29 Compact and Useful PM_2.5 Instrument with Gas sensors (CUPI-Gs). Continuous observations show that the PM_2.5 in the region increased gradually from < 60 µg m⁻³ in 6–10 October to up to 500 µg m⁻³ on 5–9 November, which subsequently decreased to about 100 µg m⁻³ in 20–30 November. Two distinct plumes of PM_2.5 over 500 µg m⁻³ are tracked from crop residue burning in Punjab to Delhi NCR on 2–3 November and 10–11 November with delays of 1 and 3 days, respectively. Experimental campaign demonstrates the advantages of source region observations to link agricultural waste burning and air pollution at local to regional scales.

  Springer Science and Business Media LLC, Aug. 2023, Scientific Reports, 13(1) (1), English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal


• Evaluation of the effect of Global Sulfur Cap 2020 on a Japanese inland sea area

  Moe Tauchi, Kazuyo Yamaji, Ryohei Nakatsubo, Yoshie Oshita, Katsuhiro Kawamoto, Yasuyuki Itano, Mitsuru Hayashi, Takatoshi Hiraki, Yutaka Takaishi, Ayami Futamura

  The Global Sulfur Cap 2020 regulation requires a decrease in the sulfur content in the fuel oil used on ships from 3.5% to 0.5%. In this study, atmospheric sulfur dioxide (SO2), nitrogen oxide (NOx), and fine particulate matter concentrations were measured in the Seto Inland Sea, a congested sea area in Japan. A rapid decrease was observed in ship emission indices, such as SO2, vanadium (V), nickel (Ni), and the V/Ni ratio, at coastal monitoring stations, providing evidence of the implementation of this regulation. Onboard observations clearly revealed a decrease in maritime gaseous SO2 immediately after the regulation came into effect; similar changes were observed in the coastal areas from January to June in 2019–2020. Although continuous studies will be needed to distinguish the benefits of the regulation from those of other factors, these findings will be useful for policymakers when addressing atmospheric pollution issues in congested sea areas.

  ELSEVIER, 2022, Case Studies on Transport Policy, 10(2) (2), 785 - 794, English

  [Refereed]

  Scientific journal


• Dominance of the residential sector in Chinese black carbon emissions as identified from downwind atmospheric observations during the COVID-19 pandemic

  Yugo Kanaya, Kazuyo Yamaji, Takuma Miyakawa, Fumikazu Taketani, Chunmao Zhu, Yongjoo Choi, Kohei Ikeda, Hiroshi Tanimoto, Daichi Yamada, Daiju Narita, Yutaka Kondo, Zbigniew Klimont

  Emissions of black carbon (BC) particles from anthropogenic and natural sources contribute to climate change and human health impacts. Therefore, they need to be accurately quantified to develop an effective mitigation strategy. Although the spread of the emission flux estimates for China have recently narrowed under the constraints of atmospheric observations, consensus has not been reached regarding the dominant emission sector. Here, we quantified the contribution of the residential sector, as 64% (44-82%) in 2019, using the response of the observed atmospheric concentration in the outflowing air during Feb-Mar 2020, with the prevalence of the COVID-19 pandemic and restricted human activities over China. In detail, the BC emission fluxes, estimated after removing effects from meteorological variability, dropped only slightly (- 18%) during Feb-Mar 2020 from the levels in the previous year for selected air masses of Chinese origin, suggesting the contributions from the transport and industry sectors (36%) were smaller than the rest from the residential sector (64%). Carbon monoxide (CO) behaved differently, with larger emission reductions (- 35%) in the period Feb-Mar 2020, suggesting dominance of non-residential (i.e., transport and industry) sectors, which contributed 70% (48-100%) emission during 2019. The estimated BC/CO emission ratio for these sectors will help to further constrain bottom-up emission inventories. We comprehensively provide a clear scientific evidence supporting mitigation policies targeting reduction in residential BC emissions from China by demonstrating the economic feasibility using marginal abatement cost curves.

  NATURE PORTFOLIO, Dec. 2021, SCIENTIFIC REPORTS, 11(1) (1), English, Co-authored internationally

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Year-round modeling of sulfate aerosol over Asia through updates of aqueous-phase oxidation and gas-phase reactions with stabilized Criegee intermediates

  Syuichi Itahashi, Risa Uchida, Kazuyo Yamaji, Satoru Chatani

  Sulfate aerosol (SO42−) is a main component of particulate matter in Asian countries. Accurate numerical modeling is important for appropriate policy-making aimed at reducing SO42− concentrations. The modeling performance for SO42− is superior among aerosol components, however, current models underestimate SO42− concentrations during winter over Asia. Previous studies have proposed a heterogeneous process for winter haze events, but these kinds of studies are limited spatially and temporally because they cover only mainland China in winter. Underestimation has also been reported in other regions where the aerosol concentration is much lower than in China. In this study, the aqueous- and gas-phase oxidation processes in the current modeling were reconsidered, and their roles were evaluated over Asia using a year-round simulation. The existing aqueous-phase oxidation of O2 with Fe and Mn as catalysts was refined, and oxidation with NO2 was added due to the neutralized atmosphere over Asia. For gas-phase oxidation, three stabilized Criegee intermediates (SCIs; formaldehyde oxide (CH2OO), acetaldehyde oxide (CH3CHOO), and propionaldehyde oxide ((CH3)2COO)) were introduced. Considering the uncertainty of the reaction of CH2OO with water, the upper and lower limits of the rate constant were applied. The updated oxidation processes led to an increase in the modeled SO42− concentration. The model performance over Asia in winter was effectively improved, and the updates did not degrade the model performance in other seasons. The improvements in biases were approximately 3% during winter, whereas the deterioration in biases were within 1% in spring to summer and 2% in autumn, when the lower limit of the CH2OO rate constant with water was used. The role of SCIs depended strongly on the rate constants of the reaction of CH2OO with water. The simulated concentration of SCIs agreed well with the estimated levels, and the lower limit of the rate constant of CH2OO with water fitted within the estimated SCIs concentration levels. SCIs may play an important role in SO42− production over Asia in winter, especially the downwind region of China. The approach taken in this study has the potential to improve modeling performance in other regions as well.

  Elsevier BV, Dec. 2021, Atmospheric Environment: X, 12, 100123 - 100123, English

  [Refereed]

  Scientific journal


• Insights into seasonal variation of wet deposition over southeast Asia via precipitation adjustment from the findings of MICS-Asia III

  Syuichi Itahashi, Baozhu Ge, Keiichi Sato, Zhe Wang, Junichi Kurokawa, Jiani Tan, Kan Huang, Joshua S. Fu, Xuemei Wang, Kazuyo Yamaji, Tatsuya Nagashima, Jie Li, Mizuo Kajino, Gregory R. Carmichael, Zifa Wang

  Asia has attracted research attention because it has the highest anthropogenic emissions in the world, and the Model Inter-Comparison Study for Asia (MICS-Asia) phase III was carried out to foster our understanding of the status of air quality over Asia. This study analyzed wet deposition in southeast Asian countries (Myanmar, Thailand, Lao People's Democratic Republic (PDR), Cambodia, Vietnam, the Philippines, Malaysia, and Indonesia) with the aim of providing insights into the seasonal variation of wet deposition. Southeast Asia was not fully considered in MICS-Asia phase II due to a lack of observational data; however, the analysis period of MICS-Asia III, namely the year 2010, is covered by ground observations of the Acid Deposition Monitoring Network in East Asia (EANET), and the coordinated simulation domain was extended to cover these observation sites. The analyzed species are wet depositions of S (sulfate aerosol, sulfur dioxide (SOspan classCombining double low ), and sulfuric acid (Hspan classCombining double low SOspan classCombining double low )), N (nitrate aerosol, nitrogen monoxide (NO), nitrogen dioxide (NO2), and nitric acid (HNO3)), and A (ammonium aerosol and ammonia (NH3)). The wet deposition simulated with seven models driven by a unified meteorological model in MICS-Asia III was used with the ensemble approach, which effectively modulates the differences in performance among models. By comparison with EANET observations, although the seven models generally captured the wet depositions of S, N, and A, there werespan idCombining double low line"page8710"/> difficulties capturing these in some cases. Considering the model performance for ambient aerosol concentrations over southeast Asia, this failure of models is considered to be related to the difficulty in capturing the precipitation in southeast Asia, especially during the dry and wet seasons. Generally, meteorological fields overestimate the precipitation during the dry season, which leads to the overestimation of wet deposition during this season. To overcome this, a precipitation-adjusted approach that scaled the modeled precipitation to the observed value was applied, and it was demonstrated that the model performance was improved. Satellite measurements were also used to adjust for precipitation data, which adequately accounted for the spatiotemporal precipitation patterns, especially in the dry season. As the statistical scores were mostly improved by this adjustment, the estimation of wet deposition with precipitation adjustment was considered to be superior. To utilize satellite measurements, the spatial distribution of wet deposition was revised. Based on this revision, it was found that Vietnam, Malaysia, and Indonesia were upward corrected, and Myanmar, Thailand, Lao PDR, Cambodia, and the Philippines were downward-corrected; these corrections were up to ±40 %. The improved accuracy of precipitation amount was key to estimating wet deposition in this study. These results suggest that the precipitation-adjusted approach has the potential to obtain accurate estimates of wet deposition through the fusion of models and observations./

  Copernicus {GmbH}, Jun. 2021, Atmospheric Chemistry and Physics, 21(11) (11), 8709 - 8734, English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal


• Nitrogen oxides concentration and emission change detection during COVID-19 restrictions in North India

  Prakhar Misra, Masayuki Takigawa, Pradeep Khatri, Surendra K. Dhaka, A. P. Dimri, Kazuyo Yamaji, Mizuo Kajino, Wataru Takeuchi, Ryoichi Imasu, Kaho Nitta, Prabir K. Patra, Sachiko Hayashida

  COVID-19 related restrictions lowered particulate matter and trace gas concentrations across cities around the world, providing a natural opportunity to study effects of anthropogenic activities on emissions of air pollutants. In this paper, the impact of sudden suspension of human activities on air pollution was analyzed by studying the change in satellite retrieved NO2 concentrations and top-down NOx emission over the urban and rural areas around Delhi. NO2 was chosen for being the most indicative of emission intensity due to its short lifetime of the order of a few hours in the planetary boundary layer. We present a robust temporal comparison of Ozone Monitoring Instrument (OMI) retrieved NO2 column density during the lockdown with the counterfactual baseline concentrations, extrapolated from the long-term trend and seasonal cycle components of NO2 using observations during 2015 to 2019. NO2 concentration in the urban area of Delhi experienced an anomalous relative change ranging from 60.0% decline during the Phase 1 of lockdown (March 25-April 13, 2020) to 3.4% during the post-lockdown Phase 5. In contrast, we find no substantial reduction in NO2 concentrations over the rural areas. To segregate the impact of the lockdown from the meteorology, weekly top-down NOx emissions were estimated from high-resolution TROPOspheric Monitoring Instrument (TROPOMI) retrieved NO2 by accounting for horizontal advection derived from the steady state continuity equation. NOx emissions from urban Delhi and power plants exhibited a mean decline of 72.2% and 53.4% respectively in Phase 1 compared to the pre-lockdown business-as-usual phase. Emission estimates over urban areas and power-plants showed a good correlation with activity reports, suggesting the applicability of this approach for studying emission changes. A higher anomaly in emission estimates suggests that comparison of only concentration change, without accounting for the dynamical and photochemical conditions, may mislead evaluation of lockdown impact. Our results shall also have a broader impact for optimizing bottom-up emission inventories.

  NATURE RESEARCH, May 2021, SCIENTIFIC REPORTS, 11(1) (1), English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Advantages of Continuous Monitoring of Hourly PM2.5 Component Concentrations in Japan for Model Validation and Source Sensitivity Analyses

  Satoru Chatani, Syuichi Itahashi, Kazuyo Yamaji

  Continuous monitoring of hourly PM2.5 component concentrations has been performed in Japan. The objective of this study was to evaluate the advantages of continuous monitoring to obtain data that can be useful for regional air quality simulations. Inclusion of transboundary transport in the simulations improved the correlation between the observed and simulated hourly concentrations of SO2-4, NO-3, secondary organic aerosols (SOA), and metals in PM2.54. Black carbon was an exception, suggesting the overestimation of emissions in upwind countries. Including volcanic and dust emissions also improved the correlations between the observed and simulated hourly concentrations of SO 2- and metals, respectively. However, despite the good correlation achieved by including transboundary transport, it also resulted in overestimated NO3- and SOA concentrations in western Japan during the winter. Further improvements are necessary, such as balancing with SO2-4 and the dry deposition of gaseous HNO3 for NO -4, and new treatment of the partitioning and aging of semivolatile organic aerosols, which have been incorporated into recent models for SOA. The differences in model performance with regard to simulating metal concentrations suggest imbalances in the speciation profiles used for countries other than Japan. Further, comparing the observed and simulated hourly concentrations helped identify the key processes driving air quality. This revealed evening peaks in black carbon concentrations, owing to the relatively stable atmosphere; and early morning peaks in NO3- concentration, owing to the low temperature and high humidity through thermodynamic equilibrium. This study demonstrated that continuous monitoring of hourly variations in PM2.5 composition is valuable for understanding the roles of the emission sources and for improving future models, both of which contribute to deriving effective PM2.5 suppression strategies.

  Korean Society for Atmospheric Environment, 2021, Asian Journal of Atmospheric Environment, 15(2) (2), 1 - 29, English

  [Refereed]

  Scientific journal


• Major reduction in black carbon emissions from china over the past decade as identified from long-term observations at fukue island, nagasaki, japan

  Yugo KANAYA, Kazuyo YAMAJI

  2021, Earozoru Kenkyu, 36(2) (2), 104 - 109

  [Refereed]


• Influence of Deposition of Atmospheric Nitrogen Compounds to the Surface Chlorophyll-a Concentration over Japan Sea

  竹谷文一, 相田真希, 関谷高志, 山地一代, 池田恒平, 松本和彦, 本多牧生, 金谷有剛

  The sensitivity of ocean phytoplankton (chlorophyll-a concentration) to deposition of atmospheric inorganic nitrogen compounds over Japan Sea was investigated using a 3-D lower trophicmarine ecosystem model (COCO-NEMURO) combined with an atmospheric regional chemical transport model (WRF-CMAQ). The monthly mean values for the wet and dry deposition of inorganic nitrogen compounds including gases (HNO3and NH3) and aerosol particles (NO3-and NH4+) over the Japan Sea were determined using the WRF-CMAQ. The results indicated that the total flux of inorganic nitrogen compounds was in the range of 82.302 μmol/m2/day and wet deposition was dominant in all season. These values were input into the ocean surface in NEMURO as a new nitrogen nutrient source from atmosphere. The annual average of surface chlorophyll-a concentration over Japan Sea was increased from 0.26 to 0.35 mg/m3. The chlorophyll-a concentration in summer season was ∼2.1, while that in winter season was ∼1.1, times higher than that without atmospheric inorganic nitrogen compounds deposition, indicating that the atmospheric deposition of inorganic nitrogen compounds significantly influence surface chlorophyll-a concentration in summer season.

  Japan Association of Aerosol Science and Technology, 2021, エアロゾル研究, 36(1) (1), 46 - 54, Japanese

  [Refereed]


• Controlling Factors of Elevated Atmospheric Pollutant Concentrations Around the Osaka Bay and Harima-Nada Sea

  Kawamoto Katsuhiro, Tauchi Moe, Yamaji Kazuyo, Nakatsubo Ryohei, Itano Yasuyuki, Yamamoto Katsuhiko, Wada Masashi, Hayashi Mitsuru

  Atmospheric pollutant concentrations have been higher around the Osaka Bay and Harima-Nada Sea, and surroundings than those in the other regions of Japan, and is pointed out to be influenced by shipping emissions. The spatio-temporal dynamics of atmospheric SO₂, NO_x, and PM_2.5 were examined based on the ship onboard observations over the Seto inland sea and atmospheric monitoring data. The Conditional Bivariate Probability Function analysis for the Tarumi and Hyogo-nanbu sites showed the air mass inflow with higher SO₂ from the Akashi Strait known as the congested sea area, and that was a different trend from the diurnal NO₂ change characterized with two peaks. Meanwhile the daytime PM_2.5 was increased in the warmer seasons but the diurnal change was lower than the SO₂ and NO_x cases, that implied the long-range PM_2.5 pollution. Ship onboard SO₂ concentrations in the maritime airmass were up to 5 times higher than those at the ground monitoring sites. On the other hand, NO_x and PM_2.5 in the maritime airmass were lower and the same levels when comparing those at the monitoring sites, respectively. These suggested that the major sources of SO₂ and NO_x existed on the sea and on the land areas, respectively.

  Japan Society for Atmospheric Environment, 2021, Journal of Japan Society for Atmospheric Environment / Taiki Kankyo Gakkaishi, 56(2) (2), 35 - 42, Japanese

  [Refereed]


• Model Inter-Comparison Study for Asia (MICS-Asia) phase III: multimodel comparison of reactive nitrogen deposition over China

  Baozhu Ge, Syuichi Itahashi, Keiichi Sato, Danhui Xu, Junhua Wang, Fan Fan, Qixin Tan, Joshua S. Fu, Xuemei Wang, Kazuyo Yamaji, Tatsuya Nagashima, Jie Li, Mizuo Kajino, Hong Liao, Meigen Zhang, Zhe Wang, Meng Li, Jung-Hun Woo, Junichi Kurokawa, Yuepeng Pan, Qizhong Wu, Xuejun Liu, Zifa Wang

  Atmospheric nitrogen deposition in China has attracted public attention in recent years due to the increasing anthropogenic emission of reactive nitrogen (N-r) and its impacts on the terrestrial and aquatic ecosystems. However, limited long-term and multisite measurements have restrained the understanding of the mechanism of the N-r deposition and the chemical transport model (CTM) improvement. In this study, the performance of the simulated wet and dry deposition for different Nr species, i.e., particulate NO3- and NH4+, gaseous NOx, HNO3 and NH3 have been conducted using the framework of Model Inter-Comparison Study for Asia (MICS-Asia) phase III. A total of nine models, including five Weather Research and Forecasting models coupled with the Community Multiscale Air Quality (WRF-CMAQ) models, two self-developed regional models, a global model and a Regional Atmospheric Modeling System coupled with the Community Multiscale Air Quality (RAMS-CMAQ) model have been selected for the comparison. For wet deposition, observation data from 83 measurement sites from the East Asia Acid Deposition Monitoring Network (EANET), Chinese Ecosystem Research Network (CERN), China Agricultural University Deposition Network (CAUDN), National Acid Deposition Monitoring Network (NADMN) and Department of Ecological Environment (DEE) of China have been collected and normalized for comparison with model results. In general, most models show the consistent spatial and temporal variation of both oxidized N (N-ox) and reduced N (N-rd) wet deposition in China, with the normalized mean error (NME) at around 50 %, which is lower than the value of 70% based on EANET observation over Asia. Both the ratio of wet or dry deposition to the total inorganic N (TIN) deposition and the ratios of TIN to their emissions have shown consistent results with the Nationwide Nitrogen Deposition Monitoring Network (NNDMN) estimates. The performance of ensemble results (ENMs) was further assessed with satellite measurements. In different regions of China, the results show that the simulated Nox wet deposition was overestimated in northeastern China (NE) but underestimated in the south of China, namely southeastern (SE) and southwestern (SW) China, while the N-rd wet deposition was underestimated in all regions by all models. The deposition of N-ox has larger uncertainties than the N-rd, especially in northern China (NC), indicating the chemical reaction process is one of the most important factors affecting the model performance. Compared to the critical load (CL) value, the N-r deposition in NC, SE and SW reached or exceeded reported CL values and resulted in serious ecological impacts. The control of N-rd in NC and SW and N-ox in SE would be an effective mitigation measure for TIN deposition in these regions. The N-r deposition in the Tibetan Plateau (TP) with a high ratio of TIN / emission (similar to 3.0), indicates a significant transmission from outside. Efforts to reduce these transmissions ought to be paramount due the climatic importance of the Tibetan region to the sensitive ecosystems throughout China.

  Copernicus {GmbH}, Sep. 2020, Atmospheric Chemistry and Physics, 20(17) (17), 10587 - 10610, English, Co-authored internationally

  [Refereed]

  Scientific journal


• Comprehensive analyses of source sensitivities and apportionments of PM_2.5 and ozone over Japan via multiple numerical techniques

  Satoru Chatani, Hikari Shimadera, Syuichi Itahashi, Kazuyo Yamaji

  Source sensitivity and source apportionment are two major indicators representing source-receptor relationships, which serve as essential information when considering effective strategies to accomplish improved air quality. This study evaluated source sensitivities and apportionments of ambient ozone and PM2.5 concentrations over Japan with multiple numerical techniques embedded in regional chemical transport models, including a brute-force method (BFM), a high-order decoupled direct method (HDDM), and an integrated source apportionment method (ISAM), to update the source-receptor relationships considering stringent emission controls recently implemented in Japan and surrounding countries. We also attempted to understand the differences among source sensitivities and source apportionments calculated by multiple techniques. While a part of ozone concentrations was apportioned to domestic sources, their sensitivities were small or even negative; ozone concentrations were exclusively sensitive to transport from outside Japan. Although the simulated PM2.5 concentrations were significantly lower than those reported by previous studies, their sensitivity to transport from outside Japan was still relatively large, implying that there has been a reduction in Japanese emissions, similar to surrounding countries including China, due to implementation of stringent emission controls. HDDM allowed us to understand the importance of the non-linear responses of PM2.5 concentrations to precursor emissions. Apportionments derived by ISAM were useful in distinguishing various direct and indirect influences on ozone and PM2.5 concentrations by combining with sensitivities. The results indicate that ozone transported from outside Japan plays a key role in exerting various indirect influences on the formation of ozone and secondary PM2.5 components. While the sensitivities come closer to the apportionments when perturbations in emissions are larger in highly non-linear relationships - including those between NH3 emissions and NH4+ concentrations, NOx emissions and NO3 concentrations, and NOx emissions and ozone concentrations - the sensitivities did not reach the apportionments because there were various indirect influences including other sectors, complex photochemical reactions, and gas-aerosol partitioning. It is essential to consider non-linear influences to derive strategies for effectively suppressing concentrations of secondary pollutants.

  Copernicus {GmbH}, Sep. 2020, Atmospheric Chemistry and Physics, 20(17) (17), 10311 - 10329, English

  [Refereed]

  Scientific journal


• Can Delhi's Pollution be Affected by Crop Fires in the Punjab Region?

  Masayuki Takigawa, Prabir K. Patra, Yutaka Matsumi, Surendra K. Dhaka, Tomoki Nakayama, Kazuyo Yamaji, Mizuo Kajino, Sachiko Hayashida

  The severe air pollution events continue to occur every year during late October and early November in Delhi, forcing air/ land traffic disruptions and anxiety in the daily life of the citizens. We analyze the behaviors of the air pollution events in October and November 2019 that arose from the crop-residue burning as seen using remote sensing techniques. Transport pathways and the mean transit time from the fire hotspots are evaluated using the FLEXPART (FLEXible PARTicle dispersion model). Our results suggest that the polluted regions in Delhi are partly influenced by the crop-residue burning. The uncertainty of our evaluation can be attributable to insufficient information on emission sources because the biomass burning emission based on daily-basis fire radiative power (FRP) of Moderate-Resolution Imaging Spectroradiometry (MODIS) is significantly degraded by the existence of hazy clouds. In future, it is desirable to establish a dense measurement network between Punjab and Delhi for the early detection of the source signals of aerosol emissions and their transport in this region. The FLEXPART model simulation shows the transport of emission signals from Punjab to Delhi, which further expands toward the Bengal region within a span of two days.

  METEOROLOGICAL SOC JAPAN, Apr. 2020, SOLA, 16, 86 - 91, English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Model Inter-Comparison for PM2.5 Components over urban Areas in Japan in the J-STREAM Framework

  Kazuyo Yamaji, Satoru Chatani, Syuichi Itahashi, Masahiko Saito, Masayuki Takigawa, Tazuko Morikawa, Isao Kanda, Yukako Miya, Hiroaki Komatsu, Tatsuya Sakurai, Yu Morino, Kyo Kitayama, Tatsuya Nagashima, Hikari Shimadera, Katsushige Uranishi, Yuzuru Fujiwara, Tomoaki Hashimoto, Kengo Sudo, Takeshi Misaki, Hiroshi Hayami

  A model inter-comparison of secondary pollutant simulations over urban areas in Japan, the first phase of Japan's study for reference air quality modeling (J-STREAM Phase I), was conducted using 32 model settings. Simulated hourly concentrations of nitric oxide (NO) and nitrogen dioxide (NO2), which are primary pollutant precursors of particulate matter with a diameter of 2.5 mu m or less (PM2.5), showed good agreement with the observed concentrations, but most of the simulated hourly sulfur oxide (SO2) concentrations were much higher than the observations. Simulated concentrations of PM2.5 and its components were compared to daily observed concentrations by using the filter pack method at selected ambient air pollution monitoring stations (AAPMSs) for each season. In general, most models showed good agreement with the observed total PM2.5 mass concentration levels in each season and provided goal or criteria levels of model ensemble statistics in warmer seasons. The good performances of these models were associated with the simulated reproducibility of some dominant components, sulfates (SO42-) and ammonium (NH4+). The other simulated PM2.5 components, i.e., nitrates (NO3-), elemental carbon (EC), and organic carbon (OC), often show clear deviations from the observations. The considerable underestimations (approximately 30 mu g/m(3) for total PM2.5) of all participant models found on heavily polluted days with approximately 40-50 mu g/m(3) for total PM2.5 indicated some problems in the simulated local meteorology such as the atmospheric stability. This model inter-comparison suggests that these deviations may be owing to a need for further improvements both in the emission inventories and additional formation pathways in chemical transport models, and meteorological conditions also require improvement to simulate elevated atmospheric pollutants. Additional accumulated observations are likely needed to further evaluate the simulated concentrations and improve the model performance.

  Lead, {MDPI} {AG}, Feb. 2020, Atmosphere, 11(3) (3), 222 - 222, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Supplementary material to "MICS-Asia III: Multi-model comparison of reactive Nitrogen deposition over China"

  Baozhu Ge, Syuichi Itahashi, Keiichi Sato, Danhui Xu, Junhua Wang, Fan Fan, Qixin Tan, Joshua S. Fu, Xuemei Wang, Kazuyo Yamaji, Tatsuya Nagashima, Jie Li, Mizuo Kajino, Hong Liao, Meigen Zhang, Zhe Wang, Meng Li, Jung-Hun Woo, Jun-ichi Kurokawa, Yuepen Pan, Qizhong Wu, Xuejun Liu, Zifa Wang

  Feb. 2020


• PM2.5 diminution and haze events over Delhi during the COVID-19 lockdown period: an interplay between the baseline pollution and meteorology

  Dhaka, S.K., Chetna, Kumar, V., Panwar, V., Dimri, A.P., Singh, N., Patra, P.K., Matsumi, Y., Takigawa, M., Nakayama, T., Yamaji, K., Kajino, M., Misra, P., Hayashida, S.

  Delhi, a tropical Indian megacity, experiences one of the most severe air pollution in the world, linked with diverse anthropogenic and biomass burning emissions. First phase of COVID-19 lockdown in India, implemented during 25 March to 14 April 2020 resulted in a dramatic near-zeroing of various activities (e.g. traffic, industries, constructions), except the "essential services". Here, we analysed variations in the fine particulate matter (PM2.5) over the Delhi-National Capital Region. Measurements revealed large reductions (by 40-70%) in PM2.5 during the first week of lockdown (25-31 March 2020) as compared to the pre-lockdown conditions. However, O-3 pollution remained high during the lockdown due to non-linear chemistry and dynamics under low aerosol loading. Notably, events of enhanced PM2.5 levels (300-400 mu g m(-3)) were observed during night and early morning hours in the first week of April after air temperatures fell close to the dew-point (similar to 15-17 degrees C). A haze formation mechanism is suggested through uplifting of fine particles, which is reinforced by condensation of moisture following the sunrise. The study highlights a highly complex interplay between the baseline pollution and meteorology leading to counter intuitive enhancements in pollution, besides an overall improvement in air quality during the COVID-19 lockdown in this part of the world.

  NATURE RESEARCH, 2020, Scientific Reports, 10(1) (1), English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal


• Why do models perform differently on particulate matter over East Asia? A multi-model intercomparison study for MICS-Asia III

  Tan, J., Tan, J., Fu, J.S., Carmichael, G.R., Itahashi, S., Tao, Z., Huang, K., Huang, K., Dong, X., Yamaji, K., Nagashima, T., Wang, X., Liu, Y., Lee, H.-J., Lin, C.-Y., Ge, B., Kajino, M., Zhu, J., Zhang, M., Liao, H., Wang, Z.

  This study compares the performance of 12 regional chemical transport models (CTMs) from the third phase of the Model Inter-Comparison Study for Asia (MICS-Asia III) on simulating the particulate matter (PM) over East Asia (EA) in 2010. The participating models include the Weather Research and Forecasting model coupled with Community Multiscale Air Quality (WRF-CMAQ; v4.7.1 and v5.0.2), the Regional Atmospheric Modeling System coupled with CMAQ (RAMS-CMAQ; v4.7.1 and v5.0.2), the Weather Research and Forecasting model coupled with chemistry (WRF-Chem; v3.6.1 and v3.7.1), Goddard Earth Observing System coupled with chemistry (GEOS-Chem), a non-hydrostatic model coupled with chemistry (NHMChem), the Nested Air Quality Prediction Modeling System (NAQPMS) and the NASA-Unified WRF (NU-WRF). This study investigates three model processes as the possible reasons for different model performances on PM. (1) Models perform very differently in the gas-particle conversion of sulfur (S) and oxidized nitrogen (N). The model differences in sulfur oxidation ratio (50 %) are of the same magnitude as that in SO42- concentrations. The gas-particle conversion is one of the main reasons for different model performances on fine mode PM. (2) Models without dust emission modules can perform well on PM10 at non-dust-affected sites but largely underestimate (up to 50 %) the PM10 concentrations at dust sites. The implementation of dust emission modules in the models has largely improved the model accuracies at dust sites (reduce model bias to 20 %). However, both the magnitude and distribution of dust pollution are not fully captured. (3) The amounts of modeled depositions vary among models by 75 %, 39 %, 21% and 38% for S wet, S dry, N wet and N dry depositions, respectively. Large inter-model differences are found in the washout ratios of wet deposition (at most 170% in India) and dry deposition velocities (generally 0.3-2 cm s(-1) differences over inland regions).

  Copernicus {GmbH}, 2020, Atmospheric Chemistry and Physics, 20(12) (12), 7393 - 7410, English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Model performance differences in fine-mode nitrate aerosol during wintertime over Japan in the J-STREAM model inter-comparison study

  Itahashi, S., Yamaji, K., Chatani, S., Kitayama, K., Morino, Y., Nagashima, T., Saito, M., Takigawa, M., Morikawa, T., Kanda, I., Miya, Y., Komatsu, H., Sakurai, T., Shimadera, H., Uranishi, K., Fujiwara, Y., Hashimoto, T., Hayami, H.

  In this study, the results for nitrate (NO3-) aerosol during winter from the first-phase model inter-comparison study of Japan's Study for Reference Air Quality Modeling (J-STREAM) were analyzed. To investigate the models' external and internal settings, the results were limited to Community Multiscale Air Quality (CMAQ) models. All submitted models generally underestimated NO(3)(-)over the urban areas in Japan (e.g., Osaka, Nagoya, and Tokyo); however, some model settings showed distinct behavior. The differences due to the model external settings were larger than the model internal settings. Emissions were an important factor, and emissions configured with lower NO(x)emissions and higher NH(3)emissions led to a higher NO(3)(-)concentration as the NH(3)was consumed under NH3-rich conditions. The model internal settings of the chemical mechanisms caused differences over China, and this could affect western Japan; however, the difference over Tokyo was lower. To obtain a higher NO(3)(-)concentration over the urban areas in Japan, the selection of the HONO option for the heterogenous reaction and the inline calculation of photolysis was desired. For future studies, the external settings of the boundary condition and the meteorological field require further investigation.

  {MDPI} {AG}, 2020, Atmosphere, 11(5) (5), 511 - 511, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Rapid reduction in black carbon emissions from China: Evidence from 2009-2019 observations on Fukue Island, Japan

  Kanaya, Y., Yamaji, K., Miyakawa, T., Taketani, F., Zhu, C., Choi, Y., Komazaki, Y., Ikeda, K., Kondo, Y., Klimont, Z.

  A long-term, robust observational record of atmospheric black carbon (BC) concentrations at Fukue Island for 2009-2019 was produced by unifying the data from a continuous soot monitoring system (COSMOS) and a Multi-Angle Absorption Photometer (MAAP). This record was then used to analyze emission trends from China. We identified a rapid reduction in BC concentrations of ( - 5.8 +/- 1.5) % yr(-1) or -48 % from 2010 to 2018. We concluded that an emission change of (-5.3 +/- 0.7) % yr(-1), related to changes in China of as much as -4.6 % yr(-1), was the main underlying driver. This evaluation was made after correcting for the interannual meteorological variability (IAV) by using the regional atmospheric chemistry model simulations from the Weather Research and Forecasting (WRF) and Community Multiscale Air Quality (CMAQ) models (collectively WRF/CMAQ) with the constant emissions. This resolves the current fundamental disagreements about the sign of the BC emissions trend from China over the past decade as assessed from bottom-up emission inventories. Our analysis supports inventories reflecting the governmental clean air actions after 2010 (e.g., MEIC1.3, ECLIPSE versions 5a and 6b, and the Regional Emission inventory in ASia (REAS) version 3.1) and recommends revisions to those that do not (e.g., Community Emissions Data System - CEDS). Our estimated emission trends were fairly uniform across seasons but diverse among air mass origins. Stronger BC reductions, accompanied by a reduction in carbon monoxide (CO) emissions, occurred in regions of south-central East China, while weaker BC reductions occurred in north-central East China and northeastern China. Prior to 2017, the BC and CO emissions trends were both unexpectedly positive in northeastern China during winter months, which possibly influenced the climate at higher latitudes. The pace of the estimated emissions reduction over China surpasses the Shared Socioeconomic Pathways (SSPs with reference to SSP1, specifically) scenarios for 2015-2030, which suggests highly successful emission control policies. At Fukue Island, the BC fraction of fine particulate matter (PM2.5) also steadily decreased over the last decade. This suggests that reductions in BC emissions started without significant delay when compared to other pollutants such as NOx and SO2, which are among the key precursors of scattering PM2.5.

  Copernicus {GmbH}, 2020, Atmospheric Chemistry and Physics, 20(11) (11), 6339 - 6356, English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Identifying key factors influencing model performance on ground-level ozone over urban areas in Japan through model inter-comparisons

  Chatani, S., Yamaji, K., Itahashi, S., Saito, M., Takigawa, M., Morikawa, T., Kanda, I., Miya, Y., Komatsu, H., Sakurai, T., Morino, Y., Nagashima, T., Kitayama, K., Shimadera, H., Uranishi, K., Fujiwara, Y., Shintani, S., Hayami, H.

  Ozone is one of remaining air quality issues in Japan. Effective strategies are required to reduce ozone at the ground level. Regional chemical transport models are useful in investigating relationships between precursor emissions and ambient concentrations of secondary pollutants including ozone. Model performance on ozone concentrations over urban areas in Japan were thoroughly evaluated in model inter-comparisons conducted in Japan's study for reference air quality modeling (J-STREAM). Specifically, 33 models with different configurations including the Community Multiscale Air Quality Modeling System (CMAQ), the Comprehensive Air Quality Model with Extensions (CAMx), and the Weather Research and Forecasting (WRF) model coupled with Chemistry (WRF-Chem) participated. They realized inter-comparisons with an unprecedented number of different model configurations. All the participating models overestimated ozone concentrations by 22 +/- 4.6 ppb over urban areas in Japan during the summer. Spatial and temporal variations in model performance suggest the influence of background ozone concentrations. Based on differences in the participating model configurations, halogen chemistry and deposition, dry deposition velocity, precursor emissions in other countries, and vertical transport were identified as the key factors influencing simulated background ozone concentrations. Specific sensitivity analyses were conducted to evaluate the effects of the key influencing factors. Halogen chemistry and deposition implemented in recent versions of CMAQ caused more than 10 ppb reduction of simulated ozone over the ocean surrounding Japan, while the original dry deposition schemes used in CAMx and WRF-Chem, without any effect of halogen, can also cause larger dry deposition. Horizontal and downward transport of ozone kept in a residual layer over the continent can spread the effect of precursor emissions in other countries to downwind regions, including Japan. Differences in vertical transport can alter the spatial extent of their effects. It is essential to improve the influence of the aforementioned key factors to realize better model performance on ozone concentrations over urban areas, not only in Japan, but all over the world.

  PERGAMON-ELSEVIER SCIENCE LTD, 2020, Atmospheric Environment, 223, English, International magazine

  [Refereed]

  Scientific journal


• MICS-Asia III: Overview of model intercomparison and evaluation of acid deposition over Asia

  Itahashi, S., Ge, B., Sato, K., Fu, J.S., Wang, X., Yamaji, K., Nagashima, T., Li, J., Kajino, M., Liao, H., Zhang, M., Wang, Z., Li, M., Kurokawa, J., Carmichael, G.R., Wang, Z.

  The Model Inter-Comparison Study for Asia (MICS-Asia) phase III was conducted to promote understanding of regional air quality and climate change in Asia, which have received growing attention due to the huge amount of anthropogenic emissions worldwide. This study provides an overview of acid deposition. Specifically, dry and wet deposition of the following species was analyzed: S (sulfate aerosol, sulfur dioxide (SO2), and sulfuric acid (H2SO4)), N (nitrate aerosol, nitrogen monoxide (NO), nitrogen dioxide (NO2), and nitric acid (HNO3)), and A (ammonium aerosol and ammonia (NH3)). The wet deposition simulated by a total of nine models was analyzed and evaluated using ground observation data from the Acid Deposition Monitoring Network in East Asia (EANET). In the phase III study, the number of observation sites was increased from 37 in the phase II study to 54, and southeast Asian countries were newly added. Additionally, whereas the analysis period was limited to representative months of each season in MICS-Asia phase II, the phase III study analyzed the full year of 2010. The scope of this overview mainly focuses on the annual accumulated deposition. In general, models can capture the observed wet deposition over Asia but underestimate the wet deposition of S and A, and show large differences in the wet deposition of N. Furthermore, the ratio of wet deposition to the total deposition (the sum of dry and wet deposition) was investigated in order to understand the role of important processes in the total deposition. The general dominance of wet deposition over Asia and attributions from dry deposition over land were consistently found in all models. Then, total deposition maps over 13 countries participating in EANET were produced, and the balance between deposition and anthropogenic emissions was calculated. Excesses of deposition, rather than of anthropogenic emissions, were found over Japan, northern Asia, and southeast Asia, indicating the possibility of long-range transport within and outside of Asia, as well as other emission sources. To improve the ability of models to capture the observed wet deposition, two approaches were attempted, namely, ensemble and precipitation adjustment. The ensemble approach was effective at modulating the differences in performance among models, and the precipitation-adjusted approach demonstrated that the model performance for precipitation played a key role in better simulating wet deposition. Finally, the lessons learned from the phase III study and future perspectives for phase IV are summarized.

  Copernicus {GmbH}, 2020, Atmospheric Chemistry and Physics, 20(5) (5), 2667 - 2693, English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Evaluation and uncertainty investigation of the NO2, CO and NH3 modeling over China under the framework of MICS-Asia III

  Kong, L., Tang, X., Zhu, J., Wang, Z., S. Fu, J., Wang, X., Itahashi, S., Yamaji, K., Nagashima, T., Lee, H.-J., Kim, C.-H., Lin, C.-Y., Chen, L., Zhang, M., Tao, Z., Li, J., Kajino, M., Liao, H., Wang, Z., Sudo, K., Wang, Y., Pan, Y., Tang, G., Li, M., Wu, Q., Ge, B., R. Carmichael, G.

  Despite the significant progress in improving chemical transport models (CTMs), applications of these modeling endeavors are still subject to large and complex model uncertainty. The Model Inter-Comparison Study for Asia III (MICS-Asia III) has provided the opportunity to assess the capability and uncertainty of current CTMs in East Asian applications. In this study, we have evaluated the multi-model simulations of nitrogen dioxide (NO2), carbon monoxide (CO) and ammonia (NH3) over China under the framework of MICS-Asia III. A total of 13 modeling results, provided by several independent groups from different countries and regions, were used in this study. Most of these models used the same modeling domain with a horizontal resolution of 45 km and were driven by common emission inventories and meteorological inputs. New observations over the North China Plain (NCP) and Pearl River Delta (PRD) regions were also available in MICS-Asia III, allowing the model evaluations over highly industrialized regions. The evaluation results show that most models captured the monthly and spatial patterns of NO2 concentrations in the NCP region well, though NO2 levels were slightly underestimated. Relatively poor performance in NO2 simulations was found in the PRD region, with larger root-mean-square error and lower spatial correlation coefficients, which may be related to the coarse resolution or inappropriate spatial allocations of the emission inventories in the PRD region. All models significantly underpredicted CO concentrations in both the NCP and PRD regions, with annual mean concentrations that were 65.4 % and 61.4 % underestimated by the ensemble mean. Such large underestimations suggest that CO emissions might be underestimated in the current emission inventory. In contrast to the good skills for simulating the monthly variations in NO2 and CO concentrations, all models failed to reproduce the observed monthly variations in NH3 concentrations in the NCP region. Most models mismatched the observed peak in July and showed negative correlation coefficients with the observations, which may be closely related to the uncertainty in the monthly variations in NH3 emissions and the NH3 gas-aerosol partitioning. Finally, model intercomparisons have been conducted to quantify the impacts of model uncertainty on the simulations of these gases, which are shown to increase with the reactivity of species. Models contained more uncertainty in the NH3 simulations. This suggests that for some highly active and/or short-lived primary pollutants, like NH3, model uncertainty can also take a great part in the forecast uncertainty in addition to the emission uncertainty. Based on these results, some recommendations are made for future studies.

  Copernicus {GmbH}, 2020, Atmospheric Chemistry and Physics, 20(1) (1), 181 - 202, English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• MICS-Asia III: multi-model comparison and evaluation of aerosol over East Asia

  Chen, L., Gao, Y., Zhang, M., Fu, J.S., Zhu, J., Liao, H., Li, J., Huang, K., Ge, B., Wang, X., Lam, Y.F., Lin, C.-Y., Itahashi, S., Nagashima, T., Kajino, M., Yamaji, K., Wang, Z., Kurokawa, J.-I.

  A total of 14 chemical transport models (CTMs) participated in the first topic of the Model Inter-Comparison Study for Asia (MICS-Asia) phase III. These model results are compared with each other and an extensive set of measurements, aiming to evaluate the current CTMs' ability in simulating aerosol concentrations, to document the similarities and differences among model performance, and to reveal the characteristics of aerosol components in large cities over East Asia. In general, these CTMs can well repro-duce the spatial-temporal distributions of aerosols in East Asia during the year 2010. The multi-model ensemble mean (MMEM) shows better performance than most single-model predictions, with correlation coefficients (between MMEM and measurements) ranging from 0.65 (nitrate, NO3-) to 0.83 (PM2.5). The concentrations of black carbon (BC), sulfate (SO42-), and PM10 are underestimated by MMEM, with normalized mean biases (NMBs) of -17.0 %, -19.1 %, and -32.6 %, respectively. Positive biases are simulated for NO3- (NMB = 4.9 %), ammonium (NH4+) (NMB = 14.0 %), and PM2.5 (NMB = 4.4 %). In comparison with the statistics calculated from MICS-Asia phase II, frequent updates of chemical mechanisms in CTMs during recent years make the intermodel variability of simulated aerosol concentrations smaller, and better performance can be found in reproducing the temporal variations of observations. However, a large variation (about a factor of 2) in the ratios of SNA (sulfate, nitrate, and ammonium) to PM2.5 is calculated among participant models. A more intense secondary formation of SO42- is simulated by Community Multi-scale Air Quality (CMAQ) models, because of the higher SOR (sulfur oxidation ratio) than other models (0.51 versus 0.39). The NOR (nitric oxidation ratio) calculated by all CTMs has larger values (similar to 0.20) than the observations, indicating that overmuch NO 3 is simulated by current models. NH3- limited condition (the mole ratio of ammonium to sulfate and nitrate is smaller than 1) can be successfully reproduced by all participant models, which indicates that a small reduction in ammonia may improve the air quality. A large coefficient of variation (CV > 1.0) is calculated for simulated coarse particles, especially over arid and semi-arid regions, which means that current CTMs have difficulty producing similar dust emissions by using different dust schemes. According to the simulation results of MMEM in six large Asian cities, different air-pollution control plans should be taken due to their different major air pollutants in different seasons. The MICS-Asia project gives an opportunity to discuss the similarities and differences of simulation results among CTMs in East Asian applications. In order to acquire a better understanding of aerosol properties and their impacts, more experiments should be designed to reduce the diversities among air quality models.

  COPERNICUS GESELLSCHAFT MBH, 2019, Atmospheric Chemistry and Physics, 19(18) (18), 11911 - 11937, English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Differences in model performance and source sensitivities for sulfate aerosol resulting from updates of the aqueous- and gas-phase oxidation pathways for a winter pollution episode in Tokyo, Japan

  Itahashi, S., Yamaji, K., Chatani, S., Hayami, H.

  During the Japanese intercomparison study, Japan's Study for Reference Air Quality Modeling (J-STREAM), it was found that wintertime SO42- concentrations were underestimated over Japan with the Community Multiscale Air Quality (CMAQ) modeling system. Previously, following two development phases, model performance was improved by refining the Fe- and Mn-catalyzed oxidation pathways and by including an additional aqueous-phase pathway via NO2 oxidation. In a third phase, we examined a winter haze period in December 2016, involving a gas-phase oxidation pathway whereby three stabilized Criegee intermediates (SCI) were incorporated into the model. We also included options for a kinetic mass transfer aqueous-phase calculation. According to statistical analysis, simulations compared well with hourly SO42- observations in Tokyo. Source sensitivities for four domestic emission sources (transportation, stationary combustion, fugitive VOC, and agricultural NH3) were investigated. During the haze period, contributions from other sources (overseas and volcanic emissions) dominated, while domestic sources, including transportation and fuel combustion, played a role in enhancing SO42- concentrations around Tokyo Bay. Updating the aqueous phase metal catalyzed and NO2 oxidation pathways lead to increase contribution from other sources, and the additional gas phase SCI chemistry provided a link between fugitive VOC emission and SO42- concentration via changes in O-3 concentration.

  MDPI, 2019, Atmosphere, 10(9) (9), 544 - 544, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Model evaluation and intercomparison of surface-level ozone and relevant species in East Asia in the context of MICS-Asia Phase III - Part 1: Overview

  Li, J., Nagashima, T., Kong, L., Ge, B., Yamaji, K., Fu, J.S., Wang, X., Fan, Q., Itahashi, S., Lee, H.-J., Kim, C.-H., Lin, C.-Y., Zhang, M., Tao, Z., Kajino, M., Liao, H., Li, M., Woo, J.-H., Kurokawa, J.-I., Wang, Z., Wu, Q., Akimoto, H., Carmichael, G.R., Wang, Z.

  Spatiotemporal variations of ozone (O-3) and nitrogen oxide (NOx) mixing ratios from 14 state-of-the-art chemical transport models (CTMs) are intercompared and evaluated with O-3 observations in East Asia, within the framework of the Model Inter-Comparison Study for Asia Phase III (MICS-Asia III). This study was designed to evaluate the capabilities and uncertainties of current CTMs simulations for Asia and to provide multi-model estimates of pollutant distributions. These models were run by 14 independent groups working in China, Japan, South Korea, the United States and other countries/regions. Compared with the previous phase of MICS-Asia (MICS-Asia II), the evaluation with observations was extended from 4 months to 1 full year across China and the western Pacific Rim. In general, model performance levels for O-3 varied widely by region and season. Most models captured the key patterns of monthly and diurnal variation of surface O-3 and its precursors in the North China Plain and western Pacific Rim but failed to do so for the Pearl River Delta. A significant overestimation of surface O-3 was evident from May to September/October and from January to May over the North China Plain, the western Pacific Rim and the Pearl River Delta. Comparisons drawn from observations show that the considerable diversity in O-3 photochemical production partly contributed to this overestimation and to high levels of inter-model variability in O-3 for North China. In terms of O-3 soundings, the ensemble average of models reproduced the vertical structure for the western Pacific, but overestimated O-3 levels to below 800 hPa in the summer. In the industrialized Pearl River Delta, the ensemble average presented an overestimation for the lower troposphere and an underestimation for the middle troposphere. The ensemble average of 13 models for O-3 did not always exhibit superior performance compared with certain individual models in contrast with its superior value for Europe. This finding suggests that the spread of ensemble-model values does not represent all of the uncertainties of O-3 or that most MICS-Asia III models missed key processes. This study improved the performance of modeling O-3 in March at Japanese sites compared with MICS-Asia II. However, it overpredicted surface O-3 concentrations for western Japan in July, which was not found by MICS-Asia II. Major challenges still remain with regard to identifying the sources of bias in surface O-3 over East Asia in CTMs.

  Copernicus {GmbH}, 2019, Atmospheric Chemistry and Physics, 19(20) (20), 12993 - 13015, English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Development of Ambient Pollutant Emission Inventory for Large Stationary Sources Classified by Sectors, Facilities, and Fuel Types in Japan

  茶谷聡, CHEEWAPHONGPHAN Penwadee, 小林伸治, 田邊潔, 山地一代, 高見昭憲

  This study has developed a new ambient pollutant emission inventory for large stationary sources classified by sectors, facilities, and fuel types. It utilizes emission factors and facility fractions derived from records of Research of Air Pollutant Emissions from Stationary Sources. Derived emission factors are consistent with existing studies. Emissions estimated in this study are consistent with emissions reported in Research of Air Pollutant Emissions from Stationary Sources. However, it is necessary to consider changes in emission factors caused by control technology developments in order to represent trends of emissions for past and future years. Vertical emission profiles for facilities have also been developed. Three-dimensional air quality simulations using emissions estimated in this study result in 1 μg/m³ increase and 2 ppb decrease of annual mean PM_2.5 and daily maximum O₃ concentrations, respectively, against simulations using existing emissions.

  Japan Society for Atmospheric Environment, 2019, 大気環境学会誌, 54(2) (2), 62 - 74, Japanese, Domestic magazine

  [Refereed]


• Uncertainties in O3 concentrations simulated by CMAQ over Japan using four chemical mechanisms

  Kitayama, K., Morino, Y., Yamaji, K., Chatani, S.

  Uncertainty was evaluated in four chemical mechanisms pertaining to O-3 concentrations predicted over Japan by the Community Multiscale Air Quality Model (CMAQ) to investigate factors contributing to model over-estimation of O-3 concentration. The model setting and meteorological and emissions input data were obtained from a Japanese model inter-comparison project, Japan's Study for Reference Air Quality Modeling (J-STREAM). The compared gas-phase chemical mechanisms included the Carbon Bond Mechanism (CB05TUCL), Regional Atmospheric Chemical Mechanism (RACM2), and two mechanisms developed by the State Air Pollution Research Center (SAPRC), namely SAPRCO7TC and SAPRC99. The O-3 concentrations produced by CB05TUCL were low compared to those from SAPRCO7TC. The RACM2 concentrations were similar to those from SAPRCO7TC over inland Japan and lower over the sea. The concentrations from SAPRC99 were higher than those from SAPRCO7TC in urban areas and lower in other areas. At most of the monitoring sites in Japan, the modeled O-3 concentrations were higher than those from observations. Module overestimation can be ranked in the order of SAPRC99 > SAPRCO7TC > RACM2 > CB05TUCL for urban sites and SAPRCO7TC > SAPRC99 > RACM2 > CB05TUCL for rural sites. The concentration differences between the chemical mechanisms were within 10 ppb, whereas those between the observed and simulated O-3 concentrations reached 40 ppb. Differences in O-3 concentrations between the chemical mechanisms accounted for only a part of the model overestimation, while the rest remained unexplained. To investigate factors influencing the differences in O-3 concentration between the chemical mechanisms, domain- and 10-vertical-layer-average hourly integrated process rates (IPRs) and integrated reaction rates (IRRs) were calculated using process analysis in CMAQ. The O-3 chemical IPRs from SAPRCO7TC were higher than those from CB05TUCL and RACM2. The SAPRC99 IPRs were higher than those from SAPRCO7TC in urban areas and lower in other areas. The IRR differences in the chemical mechanisms showed that IRRs for the O-3 and NO reactions were responsible for the differences in the O-3 chemical IPR. The coefficients of determination between the O-3 chemical process IPR and IRR differences in the chemical mechanisms were highest for the HO2-NO reaction in CB05TUCL and SAPRC99 and the RO2 -NO reaction in RACM2. Differences in reaction rate constants and lumped volatile organic compounds may have caused some of the differences in O-3 production between the chemical mechanisms.

  PERGAMON-ELSEVIER SCIENCE LTD, 2019, Atmospheric Environment, 198(198) (198), 448 - 462, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Establishing a Reference Modeling for Source Apportionment and Effective Strategy-Making for Suppressing Secondary Air Pollutants

  Satoru CHATANI, Kazuyo YAMAJI, Tatsuya SAKURAI, Hiroshi HAYAMI

  AIRIES, Dec. 2018, Global Environmental Research, 22(1&2) (1&2), 21 - 30

  [Refereed]

  Scientific journal


• Refinement of Modeled Aqueous-Phase Sulfate Production via the Fe- and Mn-Catalyzed Oxidation Pathway

  Syuichi Itahashi, Kazuyo Yamaji, Satoru Chatani, Hiroshi Hayami

  We refined the aqueous-phase sulfate (SO42-) production in the state-of-the-art Community Multiscale Air Quality (CMAQ) model during the Japanese model inter-comparison project, known as Japan's Study for Reference Air Quality Modeling (J-STREAM). In Japan, SO42- is the major component of PM2.5, and CMAQ reproduces the observed seasonal variation of SO42- with the summer maxima and winter minima. However, CMAQ underestimates the concentration during winter over Japan. Based on a review of the current modeling system, we identified a possible reason as being the inadequate aqueous-phase SO42- production by Fe- and Mn-catalyzed O-2 oxidation. This is because these trace metals are not properly included in the Asian emission inventories. Fe and Mn observations over Japan showed that the model concentrations based on the latest Japanese emission inventory were substantially underestimated. Thus, we conducted sensitivity simulations where the modeled Fe and Mn concentrations were adjusted to the observed levels, the Fe and Mn solubilities were increased, and the oxidation rate constant was revised. Adjusting the concentration increased the SO(4)(2-)concentration during winter, as did increasing the solubilities and revising the rate constant to consider pH dependencies. Statistical analysis showed that these sensitivity simulations improved model performance. The approach adopted in this study can partly improve model performance in terms of the underestimation of SO42- concentration during winter. From our findings, we demonstrated the importance of developing and evaluating trace metal emission inventories in Asia.

  {MDPI} {AG}, Apr. 2018, Atmosphere, 9(4) (4), 132 - 132, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Overview of Model Inter-Comparison in Japan’s Study for Reference Air Quality Modeling (J-STREAM)

  Satoru Chatani, Kazuyo Yamaji, Tatsuya Sakurai, Syuichi Itahashi, Hikari Shimadera, Kyo Kitayama, Hiroshi Hayami

  The inter-comparison of regional air quality models is an effective way to understand uncertainty in ambient pollutant concentrations simulated using various model configurations, as well as to find ways to improve model performance. Based on the outcomes and experiences of Japanese projects thus far, a new model inter-comparison project called Japan's study for reference air quality modeling (J-STREAM) has begun. The objective of J-STREAM is to establish reference air quality modeling for source apportionment and effective strategy making to suppress secondary air pollutants including PM2.5 and photochemical ozone in Japan through model inter-comparison. The first phase focuses on understanding the ranges and limitations in ambient PM2.5 and ozone concentrations simulated by participants using common input datasets. The second phase focuses on issues revealed in previous studies in simulating secondary inorganic aerosols, as well as on the three-dimensional characteristics of photochemical ozone as a new target. The third phase focuses on comparing source apportionments and sensitivities under heavy air pollution episodes simulated by participating models. Detailed understanding of model performance, uncertainty, and possible improvements to urban-scale air pollution involving secondary pollutants, as well as detailed sector-wise source apportionments over megacities in Japan are expected.

  {MDPI} {AG}, Jan. 2018, Atmosphere, 9(1) (1), 19 - 19, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Model performance differences in sulfate aerosol in winter over Japan based on regional chemical transport models of CMAQ and CAMx

  Itahashi, S., Yamaji, K., Chatani, S., Hisatsune, K., Saito, S., Hayami, H.

  Sulfate aerosol (SO42-) is a major component of particulate matter in Japan. The Japanese model intercomparison study, J-STREAM, found that although SO42- is well captured by models, it is underestimated during winter. In the first phase of J-STREAM, we refined the Fe- and Mn-catalyzed oxidation and partly improved the underestimation. The winter haze in December 2016 was a target period in the second phase. The results from the Community Multiscale Air Quality (CMAQ) and Comprehensive Air quality Model with eXtentions (CAMx) regional chemical transport models were compared with observations from the network over Japan and intensive observations at Nagoya and Tokyo. Statistical analysis showed both models satisfied the suggested model performance criteria. CMAQ sensitivity simulations explained the improvements in model performance. CMAQ modeled lower SO42- concentrations than CAMx, despite increased aqueous oxidation via the metal catalysis pathway and NO2 reaction in CMAQ. Deposition explained this difference. A scatter plot demonstrated that the lower SO42- concentration in CMAQ than in CAMx arose from the lower SO2 concentration and higher SO42- wet deposition in CMAQ. The dry deposition velocity caused the difference in SO2 concentration. These results suggest the importance of deposition in improving our understanding of ambient concentration behavior.

  MDPI, 2018, Atmosphere, 9(12) (12), 488 - 488, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Urban air quality model inter-comparison study (UMICS) for improvement of PM2.5 simulation in greater Tokyo Area of Japan

  Shimadera, H., Hayami, H., Chatani, S., Morikawa, T., Morino, Y., Mori, Y., Yamaji, K., Nakatsuka, S., Ohara, T.

  The urban model inter-comparison study (UMICS) was conducted in order to improve the performance of air quality models (AQMs) for simulating fine particulate matter (PM2.5) in the Greater Tokyo Area of Japan. UMICS consists of three phases: the first phase focusing on elemental carbon (UMICS1), the second phase focusing on sulfate, nitrate and ammonium (UMICS2), and the third phase focusing on organic aerosol (OA) (UMICS 3). In UMICS2/3, all the participating AQMs were the Community Multiscale Air Quality modeling system (CMAQ) with different configurations, and they similarly overestimated PM2.5 nitrate concentration and underestimated PM2.5 OA concentration. Various sensitivity analyses on CMAQ configurations, emissions and boundary concentrations, and meteorological fields were conducted in order to seek pathways for improvement of PM2.5 simulation. The sensitivity analyses revealed that PM2.5 nitrate concentration was highly sensitive to emissions of ammonia (NH3) and dry deposition of nitric acid (HNO3) and NH3, and PM2.5 OA concentration was highly sensitive to emissions of condensable organic compounds (COC). It was found that PM2.5 simulation was substantially improved by using modified monthly profile of NH3 emissions, larger dry deposition velocities of HNO3 and NH3, and additionally estimated COC emissions. Moreover, variability in PM2.5 simulation was estimated from the results of all the sensitivity analyses. The variabilities on CMAQ configurations, chemical inputs (emissions and boundary concentrations), and meteorological fields were 6.1-6.5, 9.7-10.9, and 10.3-12.3%, respectively.

  JAPAN SOC ATMOSPHERIC ENVIRONMENT, 2018, Asian Journal of Atmospheric Environment, 12(2) (2), 139 - 152, English, International magazine

  [Refereed]

  Scientific journal


• Study of Lower Tropospheric Ozone over Central and Eastern China:Comparison of Satellite Observation with Model Simulation

  Sachiko Hayashida, Satoko Kayaba, Makoto Deushi, Kazuyo Yamaji, Akiko Ono, Mizuo Kajino, Tsuyoshi Thomas Sekiyama, Takashi Maki, Xiong Liu

  Springer, 2018, Land-Atmospheric Research Applications in South and Southeast Asia, pp.255 - 275, English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal


• Seasonal Response of North Western Pacific Marine Ecosystems to Deposition of Atmospheric Inorganic Nitrogen Compounds from East Asia

  Taketani, F., Aita, M.N., Yamaji, K., Sekiya, T., Ikeda, K., Sasaoka, K., Hashioka, T., Honda, M.C., Matsumoto, K., Kanaya, Y.

  The contribution of the atmospheric deposition of inorganic nitrogen compounds produced in East Asia to the marine ecosystems of the North Western Pacific Ocean (NWPO) was investigated in this study using a 3-D lower trophic-marine ecosystem model (NEMURO) combined with an atmospheric regional chemical transport model (WRF-CMAQ). The monthly mean values for the wet and dry deposition of nitrogen compounds, including gases (HNO3 and NH3) and aerosol particles (NO3- and NH4(+)), were determined using the WRF-CMAQ for the NWPO from 2009-2016. These values were input into the NEMURO as an additional nitrogen source. The NEMURO indicated that the annual average chlorophyll mass concentration at the surface in the subtropical region (20 degrees N-30 degrees N; 125 degrees E-150 degrees E) of the NWPO increased from 0.04 to 0.10 mg/m(3). Similarly, the gross primary productivity, integrated over sea depths of 0-200 m, increased from 85 to 147 mg C/m(2)/day because of this deposition. This study indicates that the supply of atmospheric inorganic nitrogen compounds from East Asia to the NWPO could have a high nutrient impact on the marine ecosystem in the subtropical region.

  NATURE PUBLISHING GROUP, 2018, Scientific Reports, 8(1) (1), 1 - 9, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Effects of a detailed vegetation database on simulated meteorological fields, biogenic VOC emissions, and ambient pollutant concentrations over Japan

  Chatani, S., Okumura, M., Shimadera, H., Yamaji, K., Kitayama, K., Matsunaga, S.N.

  Regional air quality simulations provide powerful tools for clarifying mechanisms of heavy air pollution and for considering effective strategies for better air quality. This study introduces a new vegetation database for Japan, which could provide inputs for regional meteorological modeling, and estimating emissions of biogenic volatile organic compounds (BVOCs), both of which are essential components of simulations. It includes newly developed emission factors (EFs) of BVOCs for major vegetation types in Japan, based on existing literature. The new database contributes to improved modeling of meteorological fields due to its updated representation of larger urban areas. Using the new vegetation and EF database, lower isoprene and monoterpene, and higher sesquiterpene emissions are estimated for Japan than those derived from previously available default datasets. These slightly reduce the overestimation of ozone concentrations obtained by a regional chemical transport model, whereas their effects on underestimated secondary organic aerosol (SOA) concentrations are marginal. Further work is necessary, not only on BVOC emissions but also the other simulation components, to further improve the modeling of ozone and SOA concentrations in Japan.

  MDPI, 2018, Atmosphere, 9(5) (5), 1 - 17, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Numerical Simulation for Atmospheric Aerosol over East Asia

  山地一代

  Lead, Japan Association of Aerosol Science and Technology, 2018, エアロゾル研究, 33(3) (3), 147 - 151, Japanese, Domestic magazine

  [Refereed][Invited]


• Observed and modeled mass concentrations of organic aerosols and PM2.5 at three remote sites around the East China Sea: Roles of chemical aging

  Kanaya, Y., Matsui, H., Taketani, F., Pan, X., Komazaki, Y., Wang, Z., Chang, L., Kang, D., Choi, M., Kim, S.-Y., Kang, C.-H., Takami, A., Tanimoto, H., Ikeda, K., Yamaji, K.

  Severe PM2.5 air pollution over the Asian continent is occasionally transported across the East China Sea by the westerly winds to Japan, continuing for long distances over the Pacific Ocean. Despite such polluted air masses causing health issues, conventional models tend to underestimate levels of organic aerosols (OA) and PM2.5. Here, PM2.5 and its major components recorded during three field campaigns carried out at Fukue Island (32.75 degrees N, 128.68 degrees E), Japan (spring 2009), Rudong (32.25 degrees N, 121.37 degrees E), China (spring 2010), and Jeju (33.35 degrees N, 126.39 degrees E), Korea (autumn 2012) around the East China Sea were used to test the performance of the Weather Research and Forecasting-Chem/ATRAS-MOSAIC model. Overall, model performance was improved by introducing chemical aging represented by a volatility basis-set scheme, whereby median values of the model/observation ratio for OA were raised to 0.34-1.28 from 0.30-0.35 in the case of conventional settings. In particular, the levels of OA at the Fukue site and daytime buildup of the OA levels at all three sites were reproduced by the model. OA levels were still sometimes underestimated. This suggests that either emission rates of organic precursors are being underestimated or other pathways of OA formation are also important. Our analysis also indicates that this region is characterized by high OH concentrations, promoting chemical aging. The predictions of PM2.5 levels in the model also improved, with median values of the model/observation ratio shifting from 0.67-0.91 to 0.68-0.95, when chemical aging of OA was taken into account.

  TAIWAN ASSOC AEROSOL RES-TAAR, 2017, Aerosol and Air Quality Research, 17(12) (12), 3091 - 3105, English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal


• Source region attribution of PM2.5 mass concentrations over Japan

  Ikeda, K., Yamaji, K., Kanaya, Y., Taketani, F., Pan, X., Komazaki, Y., Kurokawa, J.-I., Ohara, T.

  We estimated the contributions of source regions in East Asia to PM2.5 mass concentrations over Japan for the year 2010 using a regional chemical transport model with an emission sensitivity approach. The horizontal distributions and temporal variations of PM2.5 concentrations were generally well reproduced by the model. The relative contribution of China to the annual mean PM2.5 concentration was estimated to be 50-60% in western Japan (from Kyushu to Kinki), and 40% in the Kanto area. Central north China (105 degrees E-124 degrees E, 34 degrees N-42 degrees N) made a particularly significant contribution, accounting for 20-40% of the annual mean PM2.5 concentration for the whole of Japan. The contribution from foreign sources increased in spring, autumn, and winter in western Japan, and in spring in the Kanto area. The domestic contribution was estimated to be 20-50%. The sum of contributions from foreign anthropogenic sources was greater than the domestic pollution in each receptor region except the Kanto region. The results were obtained from sensitivity simulations with reduced anthropogenic emissions from each source region by 20%. The uncertainties in the source-receptor relationship for annual mean PM2.5 concentrations were estimated to be within a few percent, from additional sensitivity simulations with different perturbations (a 20% increase and a 50% reduction). The model results suggest that regional-scale transport in East Asia has a significant impact on the attainment of the PM2.5 environmental standard in Japan.

  GEOCHEMICAL SOC JAPAN, 2015, Geochemical Journal, 49(2) (2), 185 - 194, English, International magazine

  [Refereed]

  Scientific journal


• Diurnal variations of fossil and nonfossil carbonaceous aerosols in Beijing

  Morino, Y., Ohara, T., Xu, J., Hasegawa, S., Zhao, B., Fushimi, A., Tanabe, K., Kondo, M., Uchida, M., Yamaji, K., Yang, L., Song, S., Dong, W., Wu, Y., Wang, S., Hao, J.

  © 2015 Elsevier Ltd. For the source apportionment of carbonaceous aerosols, measurement of 14C is an effective technique. In particular, diurnal variations of fossil and nonfossil carbonaceous aerosols provide information about the sources and production pathways of elemental carbon (EC) and organic carbon (OC). In this study, concentrations of fine-mode aerosols, including EC, OC, and 14C, were observed with a time resolution of 6 h near the urban center of Beijing in June 2010. The observations indicate that the contribution of fossil secondary organic aerosol (SOA) increased during daytime. This finding is consistent with previous studies in other urban sites, suggesting that SOA production from anthropogenic sources is important in urban areas. We evaluated the performance of two chemical transport models (CTMs) with different SOA models on simulations of EC and OC. Both models well reproduced the concentration and diurnal variation of EC. OC concentrations were underestimated by more than half by the CTM with a SOA yield model, and were better reproduced by the CTM with a volatility basis set (VBS) model. However, even the VBS model underestimated both fossil and nonfossil total carbon (EC + OC), and possible reasons for this underestimation are discussed.

  PERGAMON-ELSEVIER SCIENCE LTD, 2015, Atmospheric Environment, 122, 349 - 356, English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal


• Emissions of nonmethane volatile organic compounds from open crop residue burning in the Yangtze River Delta region, China

  Kudo, S., Tanimoto, H., Inomata, S., Saito, S., Pan, X., Kanaya, Y., Taketani, F., Wang, Z., Chen, H., Dong, H., Zhang, M., Yamaji, K.

  Open crop residue burning is one of the major sources of air pollutants including the precursors of photooxidants like ozone and secondary organic aerosol. We made measurements of trace gases including nonmethane volatile organic compounds (NMVOCs) in a rural area in central East China in June 2010. During the campaign, we identified six biomass burning events in total through the simultaneous enhancement of carbon monoxide and acetonitrile. Four cases represented fresh plumes (<2 h after emission), and two cases represented aged plumes (>3 h after emission), as determined by photochemical age. While we were not able to quantify formic acid, we identified an enhancement of major oxygenated volatile organic compounds (OVOCs) as well as low molecular alkanes and alkenes, and aromatic hydrocarbons in these plumes. The observed normalized excess mixing ratios (NEMRs) of OVOCs and alkenes showed dependence on air mass age, even in fresh smoke plumes, supporting the view that these species are rapidly produced and destructed, respectively, during plume evolution. Based on the NEMR data in the fresh plumes, we calculated the emission factors (EFs) of individual NMVOC. The comparison to previous reports suggests that the EFs of formaldehyde and acetic acid have been overestimated, while those of alkenes have been underestimated. Finally, we suggest that open burning of wheat residue in China releases about 0.34 Tg NMVOCs annually. If we applied the same EFs to all crops, the annual NMVOC emissions would be 2.33 Tg. The EFs of speciated NMVOCs can be used to improve the existing inventories.

  AMER GEOPHYSICAL UNION, 2014, Journal of Geophysical Research, 119(12) (12), 7684 - 7698, English

  [Refereed]

  Scientific journal


• Investigating Impacts on Atmospheric Environment from Ship Emissions by Using Numerical Simulations

  Yamaji Kazuyo

  Lead, The Japan Institute of Marine Engineering, 2014, Marine Engineering, 49(6) (6), 770 - 775, Japanese, Domestic magazine

  [Refereed][Invited]


• Sensitivity analysis of source regions to PM2.5 concentration at Fukue Island, Japan

  Ikeda, K., Yamaji, K., Kanaya, Y., Taketani, F., Pan, X., Komazaki, Y., Kurokawa, J.-I., Ohara, T.

  The authors analyze the sensitivities of source regions in East Asia to PM2.5 (particulate matter with an aerodynamic diameter of <= 2.5 mu m) concentration at Fukue Island located in the western part of Japan by using a regional chemical transport model with emission sensitivity simulations for the year 2010. The temporal variations in PM2.5 concentration are generally reproduced, but the absolute concentration is underestimated by the model. Chemical composition of PM2.5 in the model is compared with filter sampling data in spring; simulated sulfate, ammonium, and elemental carbon are consistent with observations, but mass concentration of particulate organic matters is underestimated. The relative contribution from each source region shows the seasonal variation, especially in summer. The contribution from central north China (105 degrees E-124 degrees E, 34 degrees N-42 degrees N) accounts for 50-60% of PM2.5 at Fukue Island except in summer; it significantly decreases in summer (18%). Central south China (105 degrees E-123 degrees E, 26 degrees N-34 degrees N) has the relative contribution of 15-30%. The contribution from the Korean Peninsula is estimated at about 10% except in summer. The domestic contribution accounts for about 7% in spring and autumn and increases to 19% in summer. We also estimate the relative contribution to daily average concentration in high PM2.5 days (>35 mu g m(-3)). Central north China has a significant contribution of 60-70% except in summer. The relative contribution from central south China is estimated at 46% in summer and about 30% in the other seasons. The contributions from central north and south China on high PM2.5 days are generally larger than those of their seasonal mean contributions. The domestic contribution is smaller than the seasonal mean value in every season; it is less than 10% even in summer. These model results suggest that foreign anthropogenic sources have a substantial impact on attainment of the atmospheric environmental standard of Japan at Fukue Island. Implications: The contribution from several source regions in East Asia to PM2.5 concentration at Fukue Island, a remote island located in the western part of Japan and close to the Asian continent, is estimated using a three-dimensional chemical transport model. The model results suggest that PM2.5 that is attributed to foreign anthropogenic sources have a larger contribution than that of domestic pollution and have a substantial impact on attainment of the atmospheric environmental standard of Japan at Fukue Island.

  TAYLOR & FRANCIS INC, 2014, Journal of the Air and Waste Management Association, 64(4) (4), 445 - 452, English, International magazine

  [Refereed]

  Scientific journal


• Sensitivity analyses of factors influencing CMAQ performance for fine particulate nitrate

  Shimadera, H., Hayami, H., Chatani, S., Morino, Y., Mori, Y., Morikawa, T., Yamaji, K., Ohara, T.

  Improvement of air quality models is required so that they can be utilized to design effective control strategies for fine particulate matter (PM2.5). The Community Multiscale Air Quality modeling system was applied to the Greater Tokyo Area of Japan in winter 2010 and summer 2011. The model results were compared with observed concentrations of PM2.5 sulfate (SO42-), nitrate (NO3-) and ammonium, and gaseous nitric acid (HNO3) and ammonia (NH3). The model approximately reproduced PM2.5 SO42- concentration, but clearly overestimated PM2.5 NO3- concentration, which was attributed to overestimation of production of ammonium nitrate (NH4NO3). This study conducted sensitivity analyses of factors associated with the model performance for PM2.5 NO3- concentration, including temperature and relative humidity, emission of nitrogen oxides, seasonal variation of NH3 emission, HNO3 and NH3 dry deposition velocities, and heterogeneous reaction probability of dinitrogen pentoxide. Change in NH3 emission directly affected NH3 concentration, and substantially affected NH4NO3 concentration. Higher dry deposition velocities of HNO3 and NH3 led to substantial reductions of concentrations of the gaseous species and NH4NO3. Because uncertainties in NH3 emission and dry deposition processes are probably large, these processes may be key factors for improvement of the model performance for PM2.5 NO3-.Implications:The Community Multiscale Air Quality modeling system clearly overestimated the concentration of fine particulate nitrate in the Greater Tokyo Area of Japan, which was attributed to overestimation of production of ammonium nitrate. Sensitivity analyses were conducted for factors associated with the model performance for nitrate. Ammonia emission and dry deposition of nitric acid and ammonia may be key factors for improvement of the model performance.

  TAYLOR & FRANCIS INC, 2014, Journal of the Air and Waste Management Association, 64(4) (4), 374 - 387, English, International magazine

  [Refereed]

  Scientific journal


• Influence of model grid resolution on NO2 vertical column densities over East Asia

  Yamaji, K., Ikeda, K., Irie, H., Kurokawa, J.-I., Ohara, T.

  NO2 vertical column densities (VCDs) over East Asia in June and December 2007 were simulated by the Community Multi-scale Air Quality (CMAQ) version 4.7.1 using an updated and more elaborate version of the Regional Emission Inventory in Asia (REAS) version 2. The modeling system could reasonably capture observed spatiotemporal changes of NO2 VCDs by satellite sensors, the Global Ozone Monitoring Experiment-2 (GOME-2), the Scanning Imaging Absorption Spectrometer for Atmospheric Cartography (SCIAMACHY), and the Ozone Monitoring Instrument (OMI), even at the coarsest horizontal resolution of 80 km. The CMAQ simulations were performed in a sequence of three horizontal resolutions (80 km, 40 km, and 20 km) for June and December 2007 to investigate the influence of changes of horizontal resolution on the obtained NO2 VCDs. CMAQ-simulated NO2 VCDs generally increased with improvements in resolution from 80 km to 40 km and then to 20 km. Increases in the CMAQ-simulated NO2 VCDs were greater for the change from 80 km to 40 km than for those from 40 km and 20 km, in which the increases of NO2 VCDs due to the improvement of horizontal resolution were approached convergence at the horizontal resolution of approximately 20 km. Conversely, no clear convergences in NO2 VCDs changes were found at near Tokyo and over the East China Sea. The biases of the NO2 VCDs simulated at a resolution of 20 km against the satellite retrievals were similar to 36% near Beijing (CHN1) and similar to 78% near Shanghai (CHN2) in summer; these errors were found to be comparable to the horizontal resolution-dependent errors, which were 18-25% at CHN1 and 44-58% at CHN2 from 80 km to 40 km. Conversely, the influence of changes of horizontal resolution in winter was relatively less compared to that in summer.Implications:NO2 VCDs over East Asia in June and December 2007 were simulated using CMAQ version 4.7.1 and REAS version 2. The modeling system could reasonably capture observed spatiotemporal changes of NO2 VCDs by satellite sensors. The CMAQ simulations were performed in a sequence of three horizontal resolutions, 80, 40, and 20 km, to investigate the influence of changes of horizontal resolution on the obtained NO2 VCDs. The results suggested that the influence of changes of horizontal resolution was larger in summer compared to that in winter. The magnitude of the influence was comparable to the biases of the NO2 VCDs simulated at a resolution of 20 km against the satellite retrievals.

  Lead, TAYLOR & FRANCIS INC, 2014, Journal of the Air and Waste Management Association, 64(4) (4), 436 - 444, English, International magazine

  [Refereed]

  Scientific journal


• An evaluation of the CMAQ reproducibility of satellite tropospheric NO2 column observations at different local times over East Asia

  Hitoshi IRIE, YAMAJI KAZUYO, Kohei IKEDA, Itsushi UNO, Shuichi ITAHASHI, Toshimasa OHARA, Junichi KUROKAWA

  May 2013, Atmospheric Chemistry and Physics Discussion, 13, 14037 - 14067, English, International magazine

  [Refereed]

  Scientific journal


• Uplifting of asian continental pollution plumes from the boundary layer to the free atmosphere over the northwestern pacific rim in spring

  Li, J., Wang, Z., Yamaji, K., Takigawa, M., Kanaya, Y., Taketani, F., Sugimoto, N., Pan, X., Hu, M., Meng, F., Sun, Y., Yang, T.

  Understanding of the uplifting of Asian pollution plumes into the free atmosphere is key to evaluating the impact of trans-Pacific transport on hemisphere-scale chemical compositions. In this study, a regional chemical transport model combined with lidar and surface observations off the northwestern Pacific Rim was used to investigate the uplifting mechanisms of Asian pollutants in the spring of 2011. The potential source regions of anthropogenic fine particulates in the boundary layer and free atmosphere in western Japan were also indentified. The model reproduced accurately the observed surface anthropogenic PM2.5 with correlation coefficient ranging from 0.5-0.65 and its vertical profiles in East Asia. Long-range transport from the Asian continent was responsible for the high anthropogenic PM2.5 concentrations in the free atmosphere over northwestern Pacific Rim in spring, with a contribution of 55-70% in selected five cases. The rarely-reported local weak trough and the saddle field over northeastern Asia were found to be important uplifting mechanisms from the boundary layer to the free atmosphere in addition to the well-known warm conveyor belt mechanism (WCB). It is suggested that more studies on these two mechanisms are needed.

  METEOROLOGICAL SOC JAPAN, 2013, Scientific Online Letters on the Atmosphere, 9(1) (1), 40 - 44, English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal


• Evaluation of the effect of surface ozone on main crops in East Asia: 2000, 2005, and 2020

  Amin, N., Ken, Y., Toshimasa, O., Junichi, K., Kazuyo, Y.

  In this paper, the possible effect of surface ozone on soybean, wheat, rice, and maize crops in East Asia in 2000, 2005, and 2020 is estimated. Spatial distribution and temporal variation of surface ozone concentrations are simulated using the Models-3 Community Multiscale Air Quality Modeling System coupled with the Regional Emission Inventory in Asia (CMAQ/REAS). The effect of surface ozone on main crops in East Asia is evaluated based on accumulated exposure over a threshold of 40 ppb (AOT40 index) during a period of 3 months of the growing season. We demonstrate some of the implications for policy-making in air quality management for East Asia by highlighting the effect of elevated surface ozone concentrations on harvest losses and the corresponding value of the main crops. These concentrations are calculated based on three scenarios of emission reduction policies in 2020: policy success case (PSC), reference case (REF), and policy failure case (PFC). Assuming no future changes in land use or cropping patterns from 2000 to 2020, we find that the highest relative yield (RY) losses are in wheat and soybean in East Asia. The RY losses for wheat are estimated to range between 17 and 35 % in 2000, 21 and 49 % in 2005, 18 and 36 % in 2020 (PSC), 20 and 46 % in 2020 (REF), and 22 and 62 % in 2020 (PFC); the corresponding values for rice are 6 and 12 %, 6 and 17 %, 6 and 15 %, 6 and 17 %, and 7 and 20 %; for soybean, they are 12 and 16 %, 19 and 25 %, 18 and 33 %, 21 and 40 %, and 25 and 49 %; and for maize, they are 3 and 4 %, 5.7 and 6 %, 6 and 9 %, 9 and 11 %, and 12 and 14 %. Quantitatively, the estimated losses in production of wheat in East Asia in 2000, 2005, and 2020 (PSC, REF, and PFC scenarios) are 32.4, 44.3, 42.2, 54.0, and 72.3 t, respectively; for rice, 34.9, 39.4, 42.4, 46.5, and 54.6 mmt; for soybean, 1.9, 3.3, 3.6, 4.9, and 7.0 mmt; and for maize, 3.6, 8.1, 11.4, 15.4, and 21.5 mmt. The estimated values of crop losses in East Asia in 2000, 2005, and 2020 (PSC, REF, and PFC scenarios) are as follows: 13.8, 17.4, 18.2, 21.3, and 26.7 billion Int. $. Therefore, adaptation measures in the PSC scenario in contrast to the PFC scenario could save around 8.5 billion Int. $ across East Asian countries in 2020.

  SPRINGER INTERNATIONAL PUBLISHING AG, 2013, Water, Air, and Soil Pollution, 224(5) (5), English, International magazine

  [Refereed]

  Scientific journal


• Overview of the Mount Tai Experiment (MTX2006) in central East China in June 2006: Studies of significant regional air pollution

  Kanaya, Y., Akimoto, H., Wang, Z.-F., Pochanart, P., Kawamura, K., Liu, Y., Li, J., Komazaki, Y., Irie, H., Pan, X.-L., Taketani, F., Yamaji, K., Tanimoto, H., Inomata, S., Kato, S., Suthawaree, J., Okuzawa, K., Wang, G., Aggarwal, S.G., Fu, P.Q., Wang, T., Gao, J., Wang, Y., Zhuang, G.

  We conducted an intensive field campaign at the summit of Mt. Tai (36.26 N, 117.11 E, 1534 m above sea level), Shandong Province, located at the center of central East China, during the period 28 May to 30 June 2006, to study seasonal maxima of regional air pollution with respect to ozone (O3) and aerosols. The specific objectives, campaign design, and major findings are summarized. High concentrations of O3 and its precursors, and aerosols, were detected and studied in the context of annual variations. Most importantly, we identified that emissions from regional-scale open crop residue burning after the harvesting of winter wheat, together with photochemical aging, strongly increased the concentrations of O3, aerosols, and primary pollutants in this month of year. Studies of in situ photochemical activity, regional source attribution of O3, O3-aerosol interactions, validation of satellite observations of tropospheric NO2, behaviors of volatile organic compounds and organic/inorganic aerosol species, loss rates of black carbon (BC), and instrument inter-comparisons are also summarized. The observed BC levels must have a strong impact on the regional climate. © Author(s) 2013.

  2013, Atmospheric Chemistry and Physics, 13(16) (16), 8265 - 8283, English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal


• Investigating the response of East Asian ozone to Chinese emission changes using a linear approach

  Kazuyo Yamaji, Itsushi Uno, Hitoshi Irie

  To illuminate the issue of trans-boundary O-3 pollution and regional O-3 reduction policies in East Asia, we have investigated the East Asian ozone (O-3) response to perturbations caused by Chinese anthropogenic emissions using the Community Multiscale Air Quality (CMAQ) model, a regional chemical transport model. The O-3 responses have been examined for the range between -100 and +100% changes from the Chinese emissions level in 2004 in 10% intervals. We have found that springtime and summertime O-3 responses both at the source and at the downwind areas can be regarded as linear over the range between -30 and +100% changes from the current emissions level. We therefore suggest that the perturbation between -30 and +100% is sufficiently small to avoid nonlinear chemical influence on O-3 formation in a model experiment to investigate East Asian scale O-3 source-receptor relationships. On the other hand, the O-3 response is strongly nonlinear in April at Hong Kong, where the current NMVOCs/NOx ratio is low and the O-3 production regime is easily moved to the NMVOCs sensitive region. The O-3 responses to the NOx emission changes have been investigated using surface O-3 concentrations at remote Japanese sites and tropospheric NO2 vertical column density (NO2 VCD) over central east China both with observations and with model simulations in springtime during 2003-2009. Analysis of satellite data shows that the observed range of NO2 VCD over central east China in 2003-2009 is the range between 25 and +34% from the 2004 level, which corresponds approximately to an emission variation between 21 and +29%. The O-3 concentration in the downwind region during 2003-2009 responds linearly to a change of the NO2 VCD over central east China both in the model and in the observation. The corresponding O-3 responses derived from surface observations at remote Japanese sites show linear features consistent with this expectation. The doubling of emissions, i.e., approximately 1.9-fold increase in the NO2 VCD from 2004, leads to O-3 increments of 5 ppbv and 8 ppbv in the model and in the observation, respectively. The modeled O-3 increase due to changes in NOx emission explains approximately 60% of the observed O-3 trend at remote Japanese sites. Thus, approximately 40% of the observed O-3 increase is unaccounted for by the NOx emissions growth. (C) 2012 Elsevier Ltd. All rights reserved.

  PERGAMON-ELSEVIER SCIENCE LTD, Aug. 2012, ATMOSPHERIC ENVIRONMENT, 55(8) (8), 475 - 482, English

  [Refereed]

  Scientific journal


• Evaluation of Premature Mortality Caused by Exposure to PM2.5 and Ozone in East Asia: 2000, 2005, 2020

  Amin Nawahda, Ken Yamashita, Toshimasa Ohara, Junichi Kurokawa, Kazuyo Yamaji

  The aim of this study is to assess the premature mortality risks caused by exposure to particulate matter with aerodynamic diameter less than 2.5 mu m (PM2.5) and ozone elevated concentrations for the years 2000, 2005, and 2020 in East Asia. The spatial distributions and temporal variations of PM2.5 and ozone concentrations are simulated using the Models-3 Community Multiscale Air Quality Modeling System coupled with the Regional Emission Inventory in Asia. The premature mortality risks caused by exposure to PM2.5 and ozone are calculated based on a relative risk (RR) value of 1.04 (95 % confidence interval (CI): 1.01-1.08) for PM2.5 concentrations above the annual mean limit of 10 mu g m(-3) taken from the World Health Organization-Air Quality Guideline and based on a RR value of 1.003 (95 % CI: 1.001-1.004) for ozone concentration above 35 ppb of the SOMO35 index (the sum of ozone daily maximum 8-h mean concentrations above 35 ppb). We demonstrate one of the implications of the policy making in the area of environmental atmospheric management in East Asia by highlighting the annual premature mortalities associated with exposure to PM2.5 concentrations that just meet an annual mean concentration of 10 mu g m(-3), as well as ozone concentrations that have a daily zero SOMO35 index in vulnerable places. Our results point to a growing health risk that may endanger human life in East Asia. We find that the effect of PM2.5 on human health is greater than the effect of ozone for the age group of 30 years and above. We estimate the corresponding premature mortality due to the effects of both ozone and PM2.5 in East Asia for the years 2000 and 2005 to be around 316,000 and 520,000 cases, respectively. For future scenarios of the year 2020, policy succeed case, reference, and policy failed case, the estimated annual premature mortality rates are 451,000, 649,000, and 1,035,000 respectively.

  SPRINGER INTERNATIONAL PUBLISHING AG, Jul. 2012, WATER AIR AND SOIL POLLUTION, 223(6) (6), 3445 - 3459, English

  [Refereed]

  Scientific journal


• Modeling studies of outflow of continental polluted air mass observed in Cape Hedo, Okinawa, during the W-PASS 2008 spring observation campaign

  鵜野伊津志, 板橋秀一, 山地一代, 高見昭憲, 長田和雄, 横内陽子, 清水厚, 兼保直樹, 梶井克純, 加藤俊吾, 古谷浩志, 植松光夫

  Characteristics of the trans-boundary pollutant transport (outflow) during the springtime W-PASS 2008 field campaign at Cape Hedo, Okinawa, were analyzed based on the regional meteorological model WRF and chemical transport model CMAQ. We found 8 large-scale intermittent transboundary outflows occurred during the observation period, and the numerical model results successfully reproduced the time and vertical variations in the major pollutants. We also showed that the typical height of the outflow of pollutants occurred below 2 km, and these features are well simulated and showed a good agreement with the NIES lidar observations at Cape Hedo. Meteorological patterns during the pollutant outflow were classified into two patterns, i.e., the 6 cases of typical behind cold front outflow (BCF) and 2 cases of transport in the northern side of the travelling high pressure system (HPN). The model simulation showed that the outflow of BCF includes the fresh air mass, while the outflow of HPN are well aged compared to the BCF cases. Sensitivity analysis with the zero-out Chinese pollutant emission was used to evaluate the correlation of SO₄ ^2-- O₃ - CO that originated from China, and confirmed that the contribution of Chinese emissions plays a dominate role when the high concentration of pollutants are observed at Cape Hedo. A comparison of NMVOC suggests the need to update the NMVOC emission inventory in order to have a good agreement with the observed level.

  Japan Society for Atmospheric Environment, 2012, 大気環境学会誌, 47(5) (5), 195 - 204, Japanese

  [Refereed]


• Impacts of aerosols on summertime tropospheric photolysis frequencies and photochemistry over Central Eastern China

  J. Li, Z. Wang, X. Wang, K. Yamaji, M. Takigawa, Y. Kanaya, P. Pochanart, Y. Liu, H. Irie, B. Hu, H. Tanimoto, H. Akimoto

  Aerosols in the troposphere influence photolysis frequencies and hence the concentrations of chemical species. We used a three-dimensional regional chemical transport model (NAQPMS) coupled with an accurate radiative transfer model to examine the impacts of aerosols on summertime photochemistry in Central Eastern China (CEC) via changing photolysis frequencies. In addition to looking at changes in concentrations as previous studies have done, we examined the changes in ozone (O3) budgets and the uncertainties related to our estimations. The 1st-12th June 2006 was selected as the simulation period when high aerosol optical depth at 550nm (AOD550) and O3 were found. A comparison of measurements showed that the model was capable of reproducing the spatial and temporal variations in photolysis frequencies, ultraviolet (UV) radiation, AOD550, cloud optical depth, O3 and other chemical constitutes in CEC. Aerosols have important impacts on atmospheric oxidation capacity in CEC. On a regional scale, aerosols decreased the average O3→O (1D) photolysis frequency by 53%, 37% and 21% in the lower, middle and upper troposphere in CEC. The uncertainties of these estimations were 37%, 25% and 14%, respectively. Mean OH concentrations decreased by 51%, 40% and 24% in layers below 1km, 1-3km and 3-10km, with uncertainties of 39%, 28% and 9%, respectively. The changes in HO2 concentrations were smaller but significant. In contrast, NOx showed a significant increase at 0-1km and 1-3km in CEC, with magnitudes of 6% and 8%. The largest relative enhancement occurred in downwind regions below 1km. Summertime boundary layer O3 (below 1km and 1-3km) was reduced by 5% with a maximum of 9% in highly polluted regions. The reduced ozone production (P (O3)) was responsible for this reduction below 3km. © 2011 Elsevier Ltd.

  Mar. 2011, Atmospheric Environment, 45(10) (10), 1817 - 1829, English, Co-authored internationally

  [Refereed]

  Scientific journal


• Impact of open crop residual burning on air quality over central eastern China during the mount tai experiment 2006 (MTX2006)

  K. Yamaji, J. Li, I. Uno, Y. Kanaya, H. Irie, M. Takigawa, Y. Komazaki, P. Pochanart, Y. Liu, H. Tanimoto, T. Ohara, X. Yan, Z. Wang, H. Akimoto

  The impact of open crop residual burning (OCRB) on O3, CO, black carbon (BC) and organic carbon (OC) concentrations over Central Eastern China (CEC; 30-40N, 111-120° E), during the Mount Tai Experiment in 2006 (MTX2006) was evaluated using a regional chemical transport model, the Modelsg-3 Community Multiscale Air Quality Modeling System (CMAQ). To investigate these pollutants during MTX2006 in June 2006, daily gridded OCRB emissions were developed based on a bottom-up methodology using land cover and hotspot information from satellites. This model system involving daily emissions captured monthlyg-averages of observed concentrations and day-to-day variations in the patterns of O3, CO, BC and OC at the summit of Mount Tai (36° N, 117° E, 1534 m a.s.l., Shandong Province of the People's Republic of China) with high correlation coefficients between the model and observations ranging from 0.55 to 0.69. These results were significantly improved from those using annual biomass burning emissions. For monthly-averaged O3, the simulated concentration of 80.8 ppbv was close to the observed concentration (81.3 ppbv). The MTX2006 period was roughly divided into two parts: 1) polluted days with heavy OCRB in the first half of June; and 2) cleaner days with negligible field burning in the latter half of June. Additionally, the first half of June was characterized by two high-pollution episodes during 5g-7 and 12g-13 June, separated by a relatively cleaner intermediate period during 8g-10 June. In the first high-pollution episode, the model captured the high O3, CO, BC and OC concentrations at the summit of Mount Tai, which were associated with OCRB over southern CEC and subsequent northward transport. For this episode, the impacts of OCRB emissions on pollutant concentrations were 26% (O3), 62% (CO), 79% (BC) and 80% (OC) at the summit of Mount Tai. The daily OCRB emissions were an essential factor in the evaluation of these pollutants during MTX2006. These emissions have a large impact not only on primary pollutants but also on secondary pollutants, such as O3, in the first half of June over northeastern Asia. The model reproduced reasonably well the variation of these pollutants in MTX2006, but underestimated daily averages of both CO and BC by a factor of 2, when using emission data from almost solely anthropogenic fuel sources in the latter half of the observation period when field burning can be neglected. © 2010 Author(s).

  2010, Atmospheric Chemistry and Physics, 10(15) (15), 7353 - 7368, English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal


• Near-ground ozone source attributions and outflow in Central Eastern China during MTX2006

  J. Li, Z. Wang, H. Akimoto, K. Yamaji, M. Takigawa, P. Pochanart, Y. Liu, H. Tanimoto, Y. Kanaya

  A 3-D regional chemical transport model, the Nested Air Quality Prediction Model System (NAQPMS), with an on-line tracer tagging module was used to study the source of the near-ground (<1.5 km above ground level) ozone at Mt. Tai (36.25° N, 117.10° E, 1534 ma.s.l.) in Central Eastern China (CEC) during the Mount Tai eXperiment 2006 (MTX2006). The model reproduced the temporal and spatial variations of near-ground ozone and other pollutants, and it captured highly polluted and clean cases well. The simulated near-ground ozone level over CEC was 60-85 ppbv (parts per billion by volume), which was higher than values in Japan and over the North Pacific (20-50 ppbv). The simulated tagged tracer data indicated that the regionalscale transport of chemically produced ozone over other areas in CEC contributed to the greatest fraction (49%) of the near-ground mean ozone at Mt. Tai in June; in situ photochemistry contributed only 12%. Due to high anthropogenic and biomass burning emissions that occurred in the southern part of the CEC, the contribution to ground ozone levels from this area played the most important role (32.4 ppbv, 37.9% of total ozone) in the monthly mean ozone concentration at Mt. Tai; values reached 59ppbv (62%) on 6-7 June 2006. The monthly mean horizontal distribution of chemically produced ozone from various ozone production regions indicated that photochemical reactions controlled the spatial distribution of O3 over CEC. The regional-scale transport of pollutants also played an important role in the spatial and temporal distribution of ozone over CEC. Chemically produced ozone from the southern part of the study region can be transported northeastwardly to the northern rim of CEC; the mean contribution was 5-10 ppbv, and it reached 25 ppbv during high ozone events. Studies of the outflow of CEC ozone and its precursors, as well as their influences and contributions to the ozone level over adjacent regions/countries, revealed that the contribution of CEC ozone to mean ozone mixing ratios over the Korean Peninsula and Japan was 5-15 ppbv, of which about half was due to the direct transport of ozone from CEC and half was produced locally by ozone precursors transported from CEC. © Author(s) 2008.

  Dec. 2008, Atmospheric Chemistry and Physics, 8(24) (24), 7335 - 7351, English

  [Refereed]

  Scientific journal


• Future prediction of surface ozone over east Asia using models-3 community multiscale air quality modeling system and regional emission inventory in Asia

  Kazuyo Yamaji, Toshimasa Ohara, Itsushi Uno, Jun-ichi Kurokawa, Pakpong Pochanart, Hajime Akimoto

  Present and future tropospheric ozone (O-3) concentrations over east Asia have been simulated by the Models-3 Community Multiscale Air Quality Modeling System (CMAQ) coupled with the Regional Emission Inventory in Asia (REAS) to predict surface O-3 variations caused by future anthropogenic emissions changes. For future prediction, REAS provides three emission scenarios for China ( the reference (REF), the policy succeed case (PSC), and the policy failure case (PFC) scenarios) and one emission scenario ( the REF scenario) for the other countries. Simulated O-3 concentration in summer was relatively high (70 - 80 ppbv in June and 65 - 75 ppbv in August) over the North China Plain in 2000. The projected REF emissions for 2020 (2020REF) enhance the monthly averaged O-3 to 75 - 90 ppbv in June and 75 - 85 ppbv in August. The projected PSC emissions for 2020 (2020PFC), including a slight NOx reduction of - 0.2 Tg ( - 2%) and a large NMVOC increase of 14.3 Tg (97%) for total Chinese emissions during 2000 - 2020, cause the monthly and annually averaged O-3 concentrations to decrease by less than 2 ppbv in northeastern and central China. Over the North China Plain, the projected PFC emissions for 2020 ( 2020PFC) cause significant increases, more than 20 ppbv in the monthly averaged O-3, and the O-3 will be 85 - 105 ppbv in June and 80 - 95 ppbv in August for 2020. The 2020PFC also affect O-3 increases in early summer in South Korea ( 14 - 18 ppbv increase for monthly average) and Japan ( 2 - 14 ppbv increase for monthly average) during 2000 - 2020 despite the slight NOx increase of 0.4 Tg (25%) in South Korea and the slight NOx reduction of - 0.2 Tg ( - 10%) in Japan during 2000 2020. The pollutant in these regions seems to be transport from upwind source regions. These experiments show that over central eastern China at midday in June, the O-3 concentration is largely affected by NOx emission increases but is insensitive to NMVOC emission increases.

  AMER GEOPHYSICAL UNION, Apr. 2008, JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 113(D8) (D8), English

  [Refereed]

  Scientific journal


• Long-term simulations of surface ozone in east Asia during 1980-2020 with CMAQ and REAS inventory

  Toshimasa Ohara, Kazuyo Yamaji, Itsushi Uno, Hiroshi Tanimoto, Seiji Sugata, Tatsuya Nagashima, Jun-ichi Kurokawa, Nobuhiro Horii, Hajime Alkimoto

  Long-term simulations of surface ozone (O-3) over East Asia during 1980-2020 were conducted using the regional scale chemical transport model (CMAQ) and the newly developed year-by-year emission inventory in Asia (REAS). The CMAQ with the REAS could reproduce the spatial and seasonal variations of the observed surface O-3 concentrations in 2000 and 2001. The historical simulation from 1980 to 2003 demonstrates that an annually-averaged concentration of surface O-3 over the Central East China (CEC) and Japan increases about 12 ppbv (1% year(-1)) and 5 ppbv (0.4% year(-1)) during a quarter century, respectively. This simulated trend in Japan generally agrees with the observed trend measured at monitoring stations and is correlated with the trend of Chinese NOx and NMVOC emissions. The future emissions up to 2020 were projected based on three emission scenarios (PSC, REF, and PFC). In 2020, the Chinese NOx emissions in each scenario are expected to increase by - 1% (PSC), +40% (REF), and +128% (PFC) from 2000, respectively. The worst scenario (PFC) shows that the East Asian NOx emissions almost double between 2000 and 2020. We find that the surface 03 concentrations in East Asia will increase significantly in the near future due to projected increases in NOx emissions.

  SPRINGER, 2008, AIR POLLUTION MODELING AND ITS APPLICATION XIX, 136 - 144, English

  [Refereed]

  International conference proceedings


• Estimation and future projections of impact on rice yields by surface ozone in China

  栗林正俊, 大原利眞, 大原利眞, 山地一代

  Increasing of surface ozone with the recent increase in the emissions of NOx and volatile organic compounds (VOC) significantly affects human health and vegetation in East Asia. In this study, we estimated the impact of the surface ozone on rice yields in China in 2000 as Relative Yield Loss (RYL), Rice Production Loss (RPL), and associated Economic Cost (EC) of RPL, using a crop loss function and ozone concentration simulated by a regional chemical transport model (CMAQ) with regional emission inventory in Asia (REAS). Additionally we projected the future RYL, RPL, and EC of RPL in 2020, using the surface ozone concentration predicted under three different emission scenarios of NOx and VOC: Policy Succeed Case (PSC), Reference Case (REF), and Policy Failed Case (PFC). Consequently, we found the following results: First, RYL, RPL, and EC in 2000 are estimated to be 6.4%, 12.8Mt, and 20.5 billion RMB, respectively. Second, RYL, RPL, and EC for each scenarios in 2020 are projected to be 6.7%, 13.4Mt, and 21.4 billion RMB for PSC, 7.6%, 15.2Mt, and 24.4 billion RMB for REF, and 9.3%, 18.6Mt, and 29.7 billion RMB for PFC, respectively. For this reason, RYL, RPL, and EC will be almost proportional to the emissions of NOx (RYL is 1.8% up, RPL is 3.6Mt up, and EC is 5.7 billion RMB up for NOx 10Mt increase, respectively). Third, the projected RPL in China in 2020 will strongly depend on the scenarios, because the RYL in the basin of Yantze river, where rice production is more than half of the total yields in China, varies with the scenarios, significantly.

  Japan Society for Atmospheric Environment, 2008, 大気環境学会誌, 43(1) (1), 55 - 66, Japanese

  [Refereed]


• Impact of Chemical Production and Transport on Summertime Diurnal Ozone Behavior at a Mountainous Site in North China Plain

  Jie Li, Pakpong Pochanart, Zifa Wang, Yu Liu, Kazuyo Yamaji, Masayuki Takigawa, Yugo Kanaya, Hajime Akimoto

  The impact of chemical production and transport on diurnal ozone behavior in June 2006 at a mountainous site (Mt. Tai) in North China Plain (NCP) was studied by regional chemical transport coupled with a process analysis and a tagged tracer method. The observed diurnal variation in the morning minimum-afternoon maximum was reproduced well. The results showed that regional transport contributed similar to 60 ppbv to "background" ozone, with no significant diurnal variations (< 7 ppbv), while the chemistry (similar to 25 ppbv) in the surrounding region (an area of 150,000 km(2)) which demonstrated an afternoon-maximum explained the causes of diurnal ozone behavior. The process analysis also suggested that in-situ chemistry accounted for most of the increase in ozone from morning to mid-afternoon (rather than the ozone concentration itself), with a minor contribution from vertical transport. A comparison was conducted between Mt. Tai and a mountainous site in Japan (Happo) to determine the regional variability in photochemistry and transport over Eastern Asia. The results showed that photochemical activities around Mt. Tai were stronger than those around Happo, where dynamic processes, rather than in-situ chemistry, played a dominant role in the diurnal behavior of ozone at midnight (0:00-3:00 local time (LT) and at the maxima-minima before noon (11:00 LT).

  METEOROLOGICAL SOC JAPAN, 2008, SOLA, 4(4) (4), 121 - 124, English, Co-authored internationally

  [Refereed]

  Scientific journal


• Recent trends and projections in Asian air pollution

  Itsushi UNO, Toshimasa OHARA, Kazuyo YAMAJI, Junichi KUROKAWA

  Jun. 2007, Journal of Disaster Research, 2, 163–172, English

  [Refereed]

  Scientific journal


• Systematic analysis of interannual and seasonal variations of model-simulated tropospheric NO2 in Asia and comparison with GOME-satellite data

  I. Uno, Y. He, T. Ohara, K. Yamaji, J. I. Kurokawa, M. Katayama, Z. Wang, K. Noguchi, S. Hayashida, A. Richter, J. P. Burrows

  Systematic analyses of interannual and seasonal variations of tropospheric NO2 vertical column densities (VCDs) based on GOME satellite data and the regional scale chemical transport model (CTM), Community Multi-scale Air Quality (CMAQ), are presented for the atmosphere over eastern Asia between 1996 and June 2003. A newly developed year-by-year emission inventory (REAS) was used in CMAQ. The horizontal distribution of annual averaged GOME NO2 VCDs generally agrees well with the CMAQ results. However, CMAQ/REAS results underestimate the GOME retrievals with factors of 2-4 over polluted industrial regions such as Central East China (CEC), a major part of Korea, Hong Kong, and central and western Japan. The most probable reasons for the underestimation typically over the CEC are accuracy of the basic energy statistic data, emission factors, and socio-economic data used for construction of emission inventory. For the Japan region, GOME and CMAQ NO2 data show reasonable agreement with respect to interannual variation and show no clear increasing trend. For CEC, GOME and CMAQ NO2 data indicate a very rapid increasing trend from 2000. Analyses of the seasonal cycle of NO2 VCDs show that GOME data have larger dips than CMAQ NO2 during February-April and September-November. Sensitivity experiments with fixed emission intensity reveal that the detection of emission trends from satellite in fall or winter has a larger error caused by the variability of meteorology. Examination during summer time and annual averaged NO2 VCDs are robust with respect to variability of meteorology and are therefore more suitable for analyses of emission trends. Analysis of recent trends of annual emissions in China shows that the increasing trends of 1996-1998 and 2000-2002 for GOME and CMAQ/REAS show good agreement, but the rate of increase by GOME is approximately 10-11% yr-1 after 2000; it is slightly steeper than CMAQ/REAS (8-9% yr-1). The greatest difference was apparent between the years 1998 and 2000: CMAQ/REAS only shows a few percentage points of increase, whereas GOME gives a greater than 8% yr-1 increase. The exact reason remains unclear, but the most likely explanation is that the emission trend based on the Chinese emission related statistics underestimates the rapid growth of emissions.

  2007, Atmospheric Chemistry and Physics, 7(6) (6), 1671 - 1681, English

  [Refereed]

  Scientific journal


• An Asian emission inventory of anthropogenic emission sources for the period 1980-2020

  T. Ohara, H. Akimoto, J. Kurokawa, N. Horii, K. Yamaji, X. Yan, T. Hayasaka

  We developed a new emission inventory for Asia (Regional Emission inventory in ASia (REAS) Version 1.1) for the period 1980-2020. REAS is the first inventory to integrate historical, present, and future emissions in Asia on the basis of a consistent methodology. We present here emissions in 2000, historical emissions for 1980-2003, and projected emissions for 2010 and 2020 of SO 2, NOx, CO, NMVOC, black carbon (BC), and organic carbon (OC) from fuel combustion and industrial sources. Total energy consumption in Asia more than doubled between 1980 and 2003, causing a rapid growth in Asian emissions, by 28% for BC, 30% for OC, 64% for CO, 108% for NMVOC, 119% for SO2, and 176% for NOx. In particular, Chinese NO x emissions showed a marked increase of 280% over 1980 levels, and growth in emissions since 2000 has been extremely high. These increases in China were mainly caused by increases in coal combustion in the power plants and industrial sectors. NMVOC emissions also rapidly increased because of growth in the use of automobiles, solvents, and paints. By contrast, BC, OC, and CO emissions in China showed decreasing trends from 1996 to 2000 because of a reduction in the use of biofuels and coal in the domestic and industry sectors. However, since 2000, Chinese emissions of these species have begun to increase. Thus, the emissions of air pollutants in Asian countries (especially China) showed large temporal variations from 1980-2003. Future emissions in 2010 and 2020 in Asian countries were projected by emission scenarios and from emissions in 2000. For China, we developed three emission scenarios: PSC (policy success case), REF (reference case), and PFC (policy failure case). In the 2020 REF scenario, Asian total emissions of SO2, NOx, and NMVOC were projected to increase substantially by 22%, 44%, and 99%, respectively, over 2000 levels. The 2020 REF scenario showed a modest increase in CO (12%), a lesser increase in BC (1%), and a slight decrease in OC (-5%) compared with 2000 levels. However, it should be noted that Asian total emissions are strongly influenced by the emission scenarios for China.

  2007, Atmospheric Chemistry and Physics, 7(16) (16), 4419 - 4444, English

  [Refereed]

  Scientific journal


• Analysis of the seasonal variation of ozone in the boundary layer in East Asia using the Community Multi-scale Air Quality model: What controls surface ozone levels over Japan?

  Kazuyo Yamaji, Toshimasa Ohara, Itsushi Uno, Hiroshi Tanimoto, Jun Ichi Kurokawa, Hajime Akimoto

  Ozone (O3) concentrations in East Asia were simulated using the Community Multi-scale Air Quality model and their reproducibility was confirmed by comparing with observation data at Japanese monitoring sites. The model can reproduce the seasonal variation of surface O3 over Japan. In particular, for the southern parts of Japan, simulated surface O3 concentrations are strongly correlated with observations. Surface O3 distribution over East Asia varies dynamically from season to season according to the meteorological condition. In May and June, 2-month average O3 concentrations in the boundary layer are highest, 55-70 ppbv over East China and Japan at 35-40°N. We estimated the seasonal variation of the contribution of chemically produced O3 by east Asian regional emissions. In the summertime, the contribution of the regional Asian emissions to O3 concentrations is around 40-70% over most of China, and the highest is 60-70% (<35 ppbv) at the mouth area of Yantze River. This suggests that O 3 concentrations over East Asia are strongly influenced by the chemical production by regional emissions during summer season. However, the inflow from outside of this model domain also contributes substantial O 3 concentration over East Asia and its contribution is predominant in winter and early spring. The seasonal change of O3 concentrations over Japan is characterized by two peaks in spring and autumn and summer minimum. The spring peak event in 2002 consists of split peaks: the first peak in Mar-Apr is mainly influenced by the inflow from outside of this model domain, the second spring peak between May and June is mainly influenced by chemically produced O3 by regional emissions. During the summer season, O 3 concentrations are the lowest over year because of the weak Asian outflow and northward penetration of the marine air mass. © 2005 Elsevier Ltd. All rights reserved.

  Mar. 2006, Atmospheric Environment, 40(10) (10), 1856 - 1868, English

  [Refereed]

  Scientific journal


• Significant latitudinal gradient in the surface ozone spring maximum over East Asia

  Hiroshi Tanimoto, Yousuke Sawa, Hidekazu Matsueda, Itsushi Uno, Toshimasa Ohara, Kazuyo Yamaji, Jun Ichi Kurokawa, Seiichiro Yonemura

  The climatology of surface ozone over East Asia was investigated at a wide range of latitudes by integrating continuous measurements from Japanese monitoring networks. Although a spring maximum and a summer minimum were observed at all seven remote stations, significant latitudinal differences in the seasonal cycles were found, particularly in spring. At low latitudes (20-30°N) the spring maximum appears in March, while it appears in April at high latitudes (40-50°N), and in May at middle latitudes (30-40°N). A regional-scale chemical transport model was applied to examine factors contributing to the latitudinal dependence observed. The model reproduces the latitudinal gradient and the overall seasonal variations well, and suggests that transport patterns of Asian continental outflow coupled with photochemistry result in latitudinal inhomogeneity over East Asia. These results highlight the key role of dynamical processes in modulating the amplitude and phase of the spring maximum in surface ozone. Copyright 2005 by the American Geophysical Union.

  Nov. 2005, Geophysical Research Letters, 32(21) (21), 1 - 5, English

  [Refereed]

  Scientific journal


• Development of the RAMS/CMAQ Asian Scale Chemical Transport Modeling System

  鵜野伊津志, 大原利真, 菅田誠治, 黒川純一, 古橋規尊, 山地一代, 谷本直隆, 弓本桂也, 植松光夫

  The CMAQ (Community Multi-scale Air Quality) model based on the RAMS (Regional Atmospheric Modeling System) for the Asian Domain was developed and the detailed descriptions of the model system and the available options are described. Emission inventory based on Streets et al., (2003a, b) and the volcanic gas emissions from Miyakejima-Oyama is used in this system. The developed RAMS/CMAQ system was used in the Asian scale gas/aerosol transport simulation during March and April 2001 with an 80 km horizontal resolution. RAMS precipitation intensity and distribution, and the CMAQ output (SO₂, O₃, SO₄, EC and OC) are compared with observation data from the Japan Meteorological Agency, EANET and VMAP (Matsumoto et al., 2003), and we confirmed that both the precipitation and concentration fields represent the majorobserved distribution well. Sensitivity analysis of the effects of volcanic gas emissions from Miyakejima-Oyama revealed that its effects are important for air quality over the central and northern Japan areas.

  Japan Society for Atmospheric Environment, 2005, 大気環境学会誌, 40(4) (4), 148 - 164, Japanese

  [Refereed]


• Regional-specific emission inventory for NH3, N2O, and CH4 via animal farming in South, Southeast, and East Asia

  Kazuyo Yamaji, Toshimasa Ohara, Hajime Akimoto

  Ammonia, nitrous oxide, and methane emission from animal farming of South, Southeast, and East Asia, in 2000, was estimated at about 4.7 Tg NH 3-N, 0.51 Tg N2O-N, and 29.9 Tg CH4, respectively, using the FAO database and countries' statistic databases as activity data, and emission factors taking account of regional characteristics. Most of these atmospheric components, up to 60-80%, were produced in China and India. Pakistan, Bangladesh, and Indonesia, which were large source countries next to China and India, contributed more than a few percent of total emission of each atmospheric component. The largest emission livestock were cattle whose contribution was considerably high in South, Southeast, and East Asia; more than one-fourth of ammonia and nitrous oxide emissions: more than half of methane emission. The other major livestock for nitrous oxide and ammonia emissions were pigs. For methane emission, buffaloes were second source livestock. To provide spatial distributions of these gases, the emissions of county and district level were allocated into each 0.5°grid by means of the weighting by high-resolution land cover datasets. The regions with considerable high emissions of all components were able to be found at the Ganges delta and the Yellow River basin. The spatial distributions for ammonia and nitrous oxide emissions were similar but had a substantial difference from methane distribution. © 2004 Elsevier Ltd. All rights reserved.

  Dec. 2004, Atmospheric Environment, 38(40 SPEC.ISS.) (40 SPEC.ISS.), 7111 - 7121, English

  [Refereed]

  Scientific journal


• Theoretical estimation of the solvent effect of the lithium isotopic reduced partition function ratio

  Hidekazu Watanabe, Kazuyo Yamaji, Akinari Sonoda, Yoji Makita, Hirofumi Kanoh, Kenta Ooi

  The reduced partition function ratios (RPFRs) of Li+(Solv)n (in which Solv = H2O, H2S, and CH3OH) clusters with different values were calculated, to investigate the solvent effect of the isotopic effect of the lithium. Structures of three solvated clusters-Li+(H2O)n, Li+(H2S)n, and Li+(CH3OH)n-were optimized by an ab initio molecular orbital method, and their RPFRs were calculated by frequency analysis. The RPFR of the solution was estimated by the extrapolation of the cluster values. The most-stable isomers of all three clusters for n ≥4 have four solvent molecules in their first shell. The RPFR is dependent mainly on the number of solvent molecules in the first shell, and the size dependence of the RPFR plateaus at n = 4. The extrapolation of these values can be regarded as the RPFR in the solutions. The RPFRs are ∼1.07 for Li+(H2O)n and Li+(CH3OH)n and are ∼1.03 for Li+(H2S)n. The smaller RPFR of Li+(H2S)n is attributed to the smaller binding energy of the Li-S bond, which is weaker than that of the Li-O bond. The present results suggest the possibility of ionophores with S atoms (such as thioether, etc.) for lithium isotopic separation.

  Oct. 2003, Journal of Physical Chemistry A, 107(39) (39), 7832 - 7844, English

  [Refereed]

  Scientific journal


• A country-specific, high-resolution emission inventory for methane from livestock in Asia in 2000

  Kazuyo Yamaji, Toshimasa Ohara, Hajime Akimoto

  Methane emissions from livestock in South, Southeast, and East Asia were estimated to be about 29.9Tg CH4 in 2000 using the Food and Agriculture Organization database and district-level data on regional activity and emission factors, considering regional specificities. These emissions consisted of 25.9Tg CH4 from enteric fermentation and 4.0Tg CH 4 from livestock manure management systems. India had the greatest production, with 11.8Tg CH4 from livestock, primarily cattle and buffaloes. China was also a high-emission country, producing about 10.4Tg CH4. To determine their spatial distribution, emissions at the country and district levels were plotted on a 0.5×0.5° grid according to weight, using high-resolution land cover/use datasets. This gridded database shows considerable emissions throughout the Ganges basin, with peak emissions exceeding 30Gg CH4 grid-1 in the Ganges River delta. The total methane emissions from livestock increased by an average of 2% per annum from 1965 to 2000. The recent increase in methane emissions in China was especially remarkable. © 2003 Elsevier Ltd. All rights reserved.

  Oct. 2003, Atmospheric Environment, 37(31) (31), 4393 - 4406, English

  [Refereed]

  Scientific journal


• Theoretical estimation of lithium isotopic reduced partition function ratio for lithium ions in aqueous solution

  Kazuyo Yamaji, Yoji Makita, Hidekazu Watanabe, Akinari Sonoda, Hirofumi Kanoh, Takahiro Hirotsu, Kenta Ooi

  The reduced partition function ratio for lithium ions in an aqueous solution is derived from the extrapolation of the values of the reduced partition function ratio (fnr) of hydrated lithium ion clusters [Li(H2O)n]+ up to n = 6. In [Li(H2O)n]+ clusters, the fnr values can be calculated from the normal vibration frequencies according to Bigeleisen and Mayer's theory. To obtain the values of fnr, the normal vibration frequency calculations were carried out for optimized structures of [Li(H2O)n]+ (n = 1-6) using the RHF/6-31+G(d), RHF/6-31++G(d,p), RHF/6-311+G(d) and MP2/6-31+G(d) methods by means of the ab initio molecular orbital method. All of those structures having high symmetry were confirmed to have real harmonic frequencies at the RHF/6-31+G(d) and RHF/6-31++G(d,p) levels. For the two RHF methods, the value of fnr, increases to about 1.07 with an increase of the hydration number n, and reaches maximum at n = 4. In the most stable isomers of [Li(H2O)n]+ clusters for n = 5 and 6, respectively, the first hydration shell is saturated with the four water molecules, and the size dependence of the fnr values converges for n ≥ 4. The converged value 1.07 can, therefore, be regarded as the reduced partition function ratio for lithium ions in aqueous solution, and gives the upper limit of the isotopic separation factor in an aqueous solution-exchanger system. © 2001 American Chemical Society.

  Jan. 2001, Journal of Physical Chemistry A, 105(3) (3), 602 - 613, English

  [Refereed]

  Scientific journal


• Estimation of Boron Isotope Separation Factors by ab initio Molecular Orbital Calculations

  Sonoda Akinari, Yamaji Kazuyo, Watanabe Hidekazu, Makita Yoji, Kanoh Hirofumi, Hirotsu Takahiro

  Boron isotope separation factors, which are calculated from boron isotope reduced partition function ratios, were estimated by ab initio molecular orbital calculations. The geometries of B (OH) ₃, B (OH) ₄^-, andtriethanolamine borate (TEA-B) were optimized and then the normal frequencies were calculated for each boronisotopes using eight kinds of the methods and ten kinds of the basis sets. The boron isotope separation factor wasabout 1.03 for both B (OH) ₃ - B (OH) ₄^- system and B (OH) ₃ -TEA-B system.

  Society of Computer Chemistry, Japan, 2000, JCPE Journal, 12(3) (3), 203 - 208, Japanese

  [Refereed]


• Long-term Variations of Urban Meteorological Elements and its Relation to Land Surface in Kagawa.

  山地一代, 米谷俊彦, 森征洋

  香川県高松市, 多度津町における気温および相対湿度の経年変化と周辺地域の地表面状態の変化について調べた. 年平均気温は長期的に上昇傾向を示し, 年平均相対湿度は急激な低下が起る時期が現れた. 気温・相対湿度の経年変化を季節別にみると, 特に春の変化率が最大となった. 1960年代に, 両観測点の周辺では比較的湿潤な地表面(水田・畑地・海など)が著しく減少し, 逆に乾燥化され易い地表面(市街地・住宅地など)が急激に増加した. 相対湿度の急激な低下の時期は, 地表面状態の急激な変化の時期と一致しており, 両者は密接に関係していることが示唆された. 一方, 年平均気温は, 同時期における周辺の土地利用の急激な変化に対応するような変化は認められなかった.

  Lead, 日本気象学会, 1999, 天気, 46(3) (3), 197 - 204, Japanese

  [Refereed]

• 大気質モデル間相互比較実験に基づく二次生成粒子濃度のモデル予測性能の評価

  山地一代, 湯淺玲奈, 茶谷聡, 嶋寺光, 板橋秀一, 櫻井達也

  2023, 大気環境学会年会講演要旨集, 64th


• 微小粒子状物質成分測定との比較によるブラックカーボン濃度のモデル再現性について

  湯淺玲奈, 山地一代, 茶谷聡, 嶋寺光, 板橋秀一, 櫻井達也, 金谷有剛

  2023, 大気環境学会年会講演要旨集, 64th


• Evaluating Impact of Ship Emissions on Atmospheric Environment - Air Quality Improvement Triggered by 2020 Global Sulphur Cap

  Yamaji Kazuyo, Tauchi Moe

  Lead, The Japan Institute of Marine Engineering, 01 Sep. 2022, Marine Engineering, 57(5) (5), 601 - 606, Japanese

  [Refereed][Invited]

  Introduction scientific journal


• Modeling analysis of impacts from Kharif crops residue burning on air quality over North India

  YAMAJI Kazuyo, YAMAJI Kazuyo, KAJINO Mizuo, KAJINO Mizuo, HAYASHIDA Sachiko, HAYASHIDA Sachiko, YODA Takashi, SASAKI Kansuke, SAITO Moeko, KAMEDA Arisu

  2022, 日本地球惑星科学連合大会予稿集(Web), 2022


• Simulated impacts of agricultural residue burning on autumn air quality in northwestern India

  KAJINO Mizuo, KAJINO Mizuo, KAJINO Mizuo, CHING Joseph, CHING Joseph, YAMAJI Kazuyo, YAMAJI Kazuyo, ISHIKAWA Rio, ISHIKAWA Rio, HAYASHIDA Sachiko, HAYASHIDA Sachiko

  2022, 日本地球惑星科学連合大会予稿集(Web), 2022


• インド北部の藁焼きがもたらす大気環境への影響評価

  山地一代, 林田佐智子, 林田佐智子, 梶野瑞王

  2022, 大気環境学会年会講演要旨集, 63rd


• 関東領域における二次汚染物質を対象とした大気質モデルの相互比較検証に関する研究

  阿部健太郎, 櫻井達也, 茶谷聡, 山地一代, 嶋寺光, 板橋秀一, 森川多津子

  2022, 大気環境学会年会講演要旨集, 63rd


• Numerical model simulations for urban air quality –Model inter-comparison to be better modeling performance–

  Kazuyo Yamaji, Satoru Chatani, Syuichi Itahashi, Hikari Shimadera

  Lead, Jul. 2021, Archives of Atmospheric Chemistry Research: AACR, (45) (45), Japanese

  [Refereed][Invited]

  Introduction scientific journal


• Vertical structural measures of atmospheric pollutants using XU-S

  YAMAJI Kazuyo, MIYAKOSHI Tetsuya, KOMATSU Satoshi, KANDA Isao

  2021, 日本地球惑星科学連合大会予稿集(Web), 2021


• Estimation of Nitrogen Deposition Flux over the Eastern Indian Ocean and Evaluation of Its Impact on Primary Production

  岩本洋子, 竹谷文一, 松本和彦, 本多牧生, SISWANTO Eko, 金谷有剛, 野口真希, 関谷高志, 川本雄大, 山地一代

  2021, エアロゾル科学・技術研究討論会(CD-ROM), 38th


• COVID-19 lockdown impacts on NOx emission: top-down estimation over North India

  MISRA Prakhar, TAKIGAWA Masayuki, KHATRI Pradeep, DHAKA S.K., DIMRI A.P., YAMAJI Kazuyo, KAJINO Mizuo, TAKEUCHI Wataru, IMASU Ryoichi, NITTA Kaho, PATRA Prabir K., HAYASHIDA Sachiko, HAYASHIDA Sachiko

  2021, 生研フォーラム論文集 宇宙からの地球環境・災害のモニタリングとリスク評価, 29th


• Controlling Factors of Elevated Atmospheric Pollutant Concentrations Around the Osaka Bay and Harima-Nada Sea

  川本雄大, 田内萌絵, 山地一代, 中坪良平, 中坪良平, 板野泰之, 山本勝彦, 和田匡司, 林美鶴, 林美鶴

  2021, 大気環境学会誌(Web), 56(2) (2)


• ニューデリーの大気質におけるパンジャブ野焼きとエアロゾル放射相互作用の影響

  梶野瑞王, 梶野瑞王, CHING Joseph, 山地一代, MISRA Prakhar, 石川里桜, 滝川雅之, PATRA Prabir, 林田佐智子, 林田佐智子

  2021, 日本気象学会大会講演予稿集(CD-ROM), (119) (119)


• モデルの検証と発生源感度解析に対する日本のPM_2.5成分濃度時間値の連続モニタリングの有用性

  茶谷聡, 板橋秀一, 山地一代

  2021, 大気環境学会年会講演要旨集, 62nd (CD-ROM)


• 西部北太平洋域における暖候期の対流圏オゾン濃度の年々変動

  森脇哲人, 山地一代

  2021, 大気環境学会年会講演要旨集, 62nd (CD-ROM)


• Influence of deposition of atmospheric nitrogen compounds on the surface marine ecosystem at the Japan Sea

  TAKETANI Fumikazu, NOGUCHI AITA Maki, SEKIYA Takashi, YAMAJI Kazuyo, YAMAJI Kazuyo, IKEDA Kohei, HONDA Makio, MATSUMOTO Kazuhiko, SASAOKA Kosei, KANAYA Yugo

  2020, 日本地球惑星科学連合大会予稿集(Web), 2020


• Model analysis of atmospheric concentrations and depositions on the Eastern Indian Ocean observed by R/V Hakuho Maru

  YAMAJI Kazuyo, KAWAMOTO Katsuhiro, TAUCHI Moe, IWAMOTO Yoko, MATSUMOTO Kazuhiko, HONDA Makio, KANAYA Yugo, SEKIYA Takashi, NOGUCHI AITA Maki, NAKAYAMA Tomoki, CHATANI Satoru, TAKETANI Fumikazu

  2020, 日本地球惑星科学連合大会予稿集(Web), 2020


• The impact of aerosols on primary productivity in the oligotrophic ocean based on the field observation

  MATSUMOTO Kazuhiko, TAKETANI Fumikazu, IWAMOTO Yoko, YAMAJI Kazuyo, HONDA Makio C

  2020, 日本地球惑星科学連合大会予稿集(Web), 2020


• Atmospheric Nitrogen Deposition to the Eastern Indian Ocean and Its Implication for Primary Production

  IWAMOTO Yoko, KAWAMOTO Katsuhiro, MATSUMOTO Kazuhiko, HONDA Makio, KANAYA Yugo, SEKIYA Takashi, NOGUCHI AITA Maki, YAMAJI Kazuyo, TAKETANI Fumikazu

  2020, 日本地球惑星科学連合大会予稿集(Web), 2020


• Impacts of ship emissions on atmospheric particulate matter and gaseous components over the Seto Inland Sea areas

  TAUCHI Moe, KAWAMOTO Katsuhiro, YAMAJI Kazuyo, NAKATSUBO Ryohei, OSHITA Yoshie, ITANO Yasuyuki

  2020, 日本地球惑星科学連合大会予稿集(Web), 2020


• CMAQによる地上オゾン濃度再現性向上のための感度解析:洋上ハロゲン過程と鉛直拡散過程

  新谷創磨, 嶋寺光, 山地一代, 茶谷聡, 松尾智仁, 近藤明

  2020, 大気環境学会年会講演要旨集, 61st (Web)


• 大気起源窒素が秋季東部インド洋の基礎生産に及ぼす影響評価

  岩本洋子, 川本雄大, 竹谷文一, 松本和彦, 本多牧生, SISWANTO Eko, 金谷有剛, 野口真希, 関谷高志, 山地一代

  2020, 日本海洋学会大会講演要旨集, 2020


• Influence of Deposition of Atmospheric Inorganic Nitrogen Compounds to Marine Ecosystem at Bay of Bengal

  TAKETANI Fumikazu, AITA Maki Noguchi, YAMAJI Kazuyo, YAMAJI Kazuyo, SEKIYA Takashi, IKEDA Kohei, HASHIOKA Taketo, HONDA Makio, MATSUMOTO Kazuhiko, KANAYA Yugo

  2019, 日本地球惑星科学連合大会予稿集(Web), 2019


• Why air quality model will underestimate sulfate aerosol in winter?

  板橋秀一, 速水洋, 山地一代, 茶谷聡

  2019, エアロゾル科学・技術研究討論会(CD-ROM), 36th


• 大気質モデルの現状と課題~J-STREAMの結果より

  山地一代

  2019, 大気環境学会年会講演要旨集, 60th (CD-ROM)


• CMAQの洋上ハロゲン過程が日本におけるオゾン濃度再現性に及ぼす影響の評価

  新谷創磨, 嶋寺光, 山地一代, 茶谷聡, 松尾智仁, 近藤明

  2019, 大気環境学会年会講演要旨集, 60th (CD-ROM)


• 2016年度のPM_2.5とオゾン濃度に対する発生源感度・寄与の包括的解析~BFMによる発生源感度概観~

  茶谷聡, 嶋寺光, 板橋秀一, 山地一代

  2019, 大気環境学会年会講演要旨集, 60th (CD-ROM)


• 北半球高緯度地域の大気質に対するアジア起源の排出影響

  山地一代, 竹谷文一, 滝川雅之, 金谷有剛, 茶谷聡

  2019, 大気環境学会年会講演要旨集, 60th (CD-ROM)


• 2016年度のPM_2.5とオゾン濃度に対する発生源感度・寄与の包括的解析~3手法による発生源感度・寄与の相互比較~

  茶谷聡, 嶋寺光, 板橋秀一, 山地一代

  2019, 大気環境学会年会講演要旨集, 60th (CD-ROM)


• Atmospheric deposition flux of inorganic nitrogen into the Eastern Indian Ocean during boreal autumn

  Iwamoto Yoko, Kawamoto Katsuhiro, Taketani Fumikazu, Kanaya Yugo, Noguchi―Aita Maki, Sekiya Takashi, Yamaji Kazuyo

  GEOCHEMICAL SOCIETY OF JAPAN, 2019, Abstracts of Annual Meeting of the Geochemical Society of Japan, 66th(0) (0), 71 - 71, Japanese


• Model analysis of long-range transport of black carbon from Asian continent into the high-latitude regions during MIRAI Arctic research cruise, MR15-03

  YAMAJI Kazuyo, TAKETANI Fumikazu, TABUCHI Masashi, TAKIGAWA Masayuki, CHATANI Satoru

  2018, 日本地球惑星科学連合大会予稿集(Web), 2018


• Potential of Deposition of Atmospheric Inorganic Nitrogen Compounds Produced at East Asia to Marine Ecosystem at North Western Pacific Ocean

  TAKETANI Fumikazu, NOGUCHI AITA Maki, YAMAJI Kazuyo, YAMAJI Kazuyo, SEKIYA Takashi, IKEDA Kohei, IKEDA Kohei, SASAOKA Kosei, HASHIOKA Taketo, HONDA Makio, MATSUMOTO Kazuhiko, KANAYA Yugo

  2018, 日本地球惑星科学連合大会予稿集(Web), 2018


• モデル再現性評価~測定値をモデル再現性の評価に使う際に考えるべきこと~

  山地一代, 永島達也, 茶谷聡

  2018, 大気環境学会年会講演要旨集, 59th


• 固定発生源の業種別・施設種別・燃料種別汚染物質排出インベントリの構築

  茶谷聡, CHEEWAPHONGPHAN Penwadee, 小林伸治, 田邊潔, 山地一代, 高見昭憲

  2018, 大気環境学会年会講演要旨集, 59th


• 揮発性有機化合物排出インベントリの空間分布および未把握発生源の検討

  茶谷聡, 山地一代

  2018, 大気環境学会年会講演要旨集, 59th


• 中国の農業残渣焼却が与える大気汚染への影響分析

  呂曉萍, 林田佐智子, 山地一代

  2018, 日本気象学会大会講演予稿集, (114) (114)


• 関西・関東都市域におけるPM_2.5濃度再現性向上のための感度解析-粒子状物質の雲底下洗浄過程-

  松井駿佑, 嶋寺光, 山地一代, 茶谷聡, 松尾智仁, 近藤明

  2018, 大気環境学会年会講演要旨集, 59th


• 2016年12月に観測されたPM2.5濃度上昇のモデル再現性について

  山地一代, 茶谷聡, 北山響, 板橋秀一, 斎藤正彦, 滝川雅之, 森川多津子, 神田勲, 渡邊茂, 櫻井達也, 嶋寺光, 浦西克維, 藤原禅, 菅田誠治, 桐山悠祐, 秦寛夫, 齊藤伸治, 山神真紀子, 池盛文数, 久恒邦裕, 長田和雄, 速水洋

  (公社)大気環境学会, 2018, 大気環境学会年会講演要旨集, 59th, 516 - 516, Japanese


• 東アジア大気汚染物質の海洋沈着が海洋低次生態系へ及ぼす影響評価

  竹谷文一, 野口真希, 関谷高志, 松本和彦, 山地一代

  公益財団法人アサヒグループ学術振興財団, 2018, アサヒグループ学術振興財団研究紀要(Web), 2018, Japanese, Domestic magazine

  Introduction research institution


• 大気質モデル間相互比較研究J-STREAMの現状と課題

  山地一代

  2017, 大気環境学会年会講演要旨集, 58th


• 練習船深江丸による瀬戸内海におけるPM_2.5の洋上観測

  川本雄大, 柿花諒太朗, 山地一代, 林美鶴, 中坪良平, 板野泰之, 山本勝彦, 和田匡司

  2017, 大気環境学会年会講演要旨集, 58th


• 物質輸送シミュレーションとMAX-DOAS法による東シナ海のNO₂カラム濃度長期変動解析

  平山友基, 金谷有剛, 山地一代

  2017, 大気環境学会年会講演要旨集, 58th


• 2013年度関西・関東都市域におけるPM_2.5とその成分に対する大気質モデルの再現性評価

  松井駿佑, 嶋寺光, 山地一代, 茶谷聡, 松尾智仁, 近藤明

  2017, 大気環境学会年会講演要旨集, 58th


• 高解像度植生・植物起源VOC排出インベントリデータベースの構築と気象・大気質シミュレーションへの影響

  茶谷聡, 奥村智憲, 嶋寺光, 山地一代, 北山響, 松永壮

  2017, 大気環境学会年会講演要旨集, 58th


• 化学物質輸送モデルの冬季の硫酸塩過小評価要因の検討

  板橋秀一, 速水洋, 山地一代, 茶谷聡

  2017, 大気環境学会年会講演要旨集, 58th


• 大気質モデル間相互比較研究J-STREAMの概要

  茶谷聡, 菅田誠治, 永島達也, 森野悠, 山地一代, 速水洋, 板橋秀一, 櫻井達也

  2017, 大気環境学会年会講演要旨集, 58th


• 大気モデル化学反応メカニズムの違いによるO₃濃度差の評価

  北山響, 森野悠, 山地一代, 茶谷聡

  2017, 大気環境学会年会講演要旨集, 58th


• 西部北太平洋域での大気窒素化合物沈着による海洋低次生態系への寄与評価

  竹谷文一, 相田真希, 池田恒平, 山地一代, 笹岡晃征, 松本和彦, 本多牧生, 金谷有剛

  2017, 日本地球惑星科学連合大会予稿集(Web), 2017


• Evaluation of performance of simulated secondary air pollutants by using air quality models for the Kanto area in summer 2011

  YAMAJI Kazuyo, UEDE Hirokazu, CHATANI Satoru, HAYAMI Hiroshi, SHIMADERA Hikari

  2016, 日本地球惑星科学連合大会予稿集(Web), 2016


• 中国中東部におけるオゾン増加:衛星観測とモデルシミュレーションの比較

  林田佐智子, 出牛真, 山地一代, 梶野瑞王, 関山剛, 眞木貴史

  2016, 日本気象学会大会講演予稿集, (109) (109)


• 都市域を対象とした大気質モデルによる二次大気汚染物質の再現性の評価

  山地一代, 上出広和, 茶谷聡, 速水洋, 嶋寺光

  2016, 大気環境学会年会講演要旨集, 57th


• 東アジアにおける下部対流圏オゾンの衛星観測とモデルシミュレーションの比較

  林田佐智子, 出牛真, 梶野瑞王, 山地一代, 関山剛, 眞木貴史

  2016, 日本地球惑星科学連合大会予稿集(Web), 2016


• 化学輸送モデルにおける日本南西海域での夏季オゾン過大評価傾向の要因について

  山地一代, 金谷有剛, 滝川雅之, 須藤健悟

  2015, 大気環境学会年会講演要旨集, 56th


• 瀬戸内海周辺地域を対象としたPM2.5汚染評価モデルシステムの構築

  山地一代

  2015, ひょうご科学技術協会研究成果報告書(Web), 2015


• 八方尾根におけるオゾンおよびCO,CO2,CH4の観測と化学輸送モデルによる起源推定

  岡本祥子, 谷本浩志, 奈良英樹, 池田恒平, 山地一代

  2015, 日本地球惑星科学連合大会予稿集(Web), 2015


• 東アジアにおける大気微量成分の衛星観測結果とモデルシミュレーションの比較

  茅場聡子, 林田佐智子, 林田佐智子, 小野朗子, 小野朗子, 出牛真, 梶野瑞王, 関山剛, 眞木貴史, 山地一代

  日本気象学会, 2015, 日本気象学会大会講演予稿集, 108(108) (108), 445 - 445, Japanese


• 2009-2013年の福江島におけるPM_2.5とオゾンの変動解析

  山地一代, 池田恒平, 金谷有剛, 竹谷文一, 谷本浩志

  2014, 大気環境学会年会講演要旨集, 55th


• Source region attribution of PM2.5 mass concentrations over Japan

  Ikeda Kohei, Yamaji Kazuyo, Kanaya Yugo, Taketani Fumikazu, Pan Xiaole, Komazaki Yuichi, Kurokawa Jun-ichi, Ohara Toshimasa

  化学輸送モデルを用いて排出量感度実験を行い、2010年の日本のPM2.5質量濃度に対する人為起源の発生源地域別寄与を評価した。モデルはPM2.5濃度の時間変動や地域分布を概ね再現していた。年平均濃度に対する中国からの寄与は、関東以西で40-60%を占めた。中国の中では、中国中北部からの寄与が主要であった。越境輸送の寄与は、西日本では、秋から春季にかけて大きくなり、夏季に小さくなった。西日本では、日本国外からの寄与が国内起源を上回る一方、関東地方では国内起源が最も重要(50%)であった。東アジアスケールの越境輸送が、環境基準の達成に対し重要な一因となることが示唆された。

  GEOCHEMICAL SOCIETY OF JAPAN, 2014, Abstracts of Annual Meeting of the Geochemical Society of Japan, 61st(0) (0), 150 - 150, Japanese


• Comprehensive sensitivity analyses on air quality model performance for PM2.5 simulation

  Hikari Shimadera, Hiroshi Hayami, Satoru Chatan, Taz UKo Morikawa, Yu Morino, Toshimasa Ohara, Yasuaki Mori, Kazuyo Yamaji, Seiji NakatsUKa

  © Crown Copyright 2014 Dstl. The urban air quality model inter-comParison study in Japan (UMICS) was conducted in order to improve the Community Multiscale Air Quality model (CMAQ) performance of the for PM2.5 simulation. UMICS consist of three phases including the first phase focusing on elemental carbon, the second phase focusing on major ionic components (sulfate, nitrate and ammonium) and the third phase focusing on organic aerosol (OA) (UMICS1, 2 and 3). The results of UMICS3 for improvement of substantial OA underestimation were described in this paper. Because primary OA accounted for most of OA in the participating models, changes in volatile organic compounds emissions caused only slight changes in OA concentrations. Meanwhile, additional primary OA emissions because of a large amount of semi-volatile organic compounds and condensable organic compounds emissions substantially increased OA concentrations. The results emphasized the importance of emission sources that were not considered in the existing emission data. In addition, sensitivity analyses on various processes including meteorology and emission were conducted in order to show errors of PM2.5 simulation originating from model input data and configurations. The results indicated that the importance of model input data is comparable to, or greater than that of model configurations in improvement of model performance for PM2.5 simulation.

  2014, HARMO 2014 - 16th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, Proceedings, 119 - 123

  [Refereed]


• The burden of premature mortality in East Asia due to PM_2.5 and ozone

  NAWAHDA Amin, YAMASHITA Ken, OHARA Toshimasa, KUROKAWA Junichi, YAMAJI Kazuyo

  2013, 大気環境学会年会講演要旨集, 54th


• 衛星搭載散乱計と放射計を用いた日本近海における洋上風速推定精度の検証

  森田承宏, 香西克俊, 大澤輝夫, 山地一代

  2013, 日本気象学会関西支部例会講演要旨集, (131) (131)


• 日本のPM_2.5質量濃度に対する発生源地域の感度解析

  池田恒平, 山地一代, 金谷有剛, 竹谷文一, PAN Xiaole, 駒崎雄一, 黒川純一, 大原利眞

  2013, 大気環境学会年会講演要旨集, 54th


• 福江島における暖候期オゾン濃度のモデル再現性に関する研究

  山地一代, 山地一代, 滝川雅之, 池田恒平, 金谷有剛, PAN Xiaole, 谷本浩志

  2013, 大気環境学会年会講演要旨集, 54th


• メソ気象モデルWRFの4次元同化による台湾海峡の風況調査

  金英花, 香西克俊, 大澤輝夫, 山地一代

  2013, 日本気象学会関西支部例会講演要旨集, (131) (131)


• 大気質モデルによるPM_2.5主要成分の再現性向上のための感度解析

  嶋寺光, 速水洋, 茶谷聡, 森川多津子, 大原利眞, 森康彰, 山地一代, 中塚誠次

  2013, エアロゾル科学・技術研究討論会, 30th


• 球形粒子の光学的スケールハイトを利用した化学輸送モデルとライダー観測におけるエアロゾル鉛直分布比較

  清水厚, 山地一代

  日本気象学会, 2013, 日本気象学会大会講演予稿集, 103(103) (103), 306 - 306, Japanese


• GOME-2,SCIAMACHY,OMIの対流圏NO₂カラム衛星データを複合利用したCMAQモデルの評価

  入江仁士, 山地一代, 池田恒平, 鵜野伊津志, 板橋秀一, 大原利眞, 黒川純一

  日本気象学会, 2013, 日本気象学会大会講演予稿集, 104(104) (104), 339 - 339, Japanese


• 黄海・東シナ海のSST解像度が春季の大気汚染物質の輸送・沈着に与える影響

  池田恒平, 山地一代, 滝川雅之, 竹谷文一, 金谷有剛

  日本気象学会, 2012, 日本気象学会大会講演予稿集, 102(102) (102), 532 - 532, Japanese


• P-28 Model performance for PM2.5 concentration and components at Fukue Island in autumn 2011(Poster session)

  IKEDA Kohei, TAKETANI Fumikazu, YAMAJI Kazuyo, KANAYA Yugo, KUROKAWA Junichi, OHARA Toshimasa

  大気環境学会, 2012, 大気環境学会年会講演要旨集, 53rd(53) (53), 258 - 258, Japanese


• 2A1000 Source apportionment of carbonaceous aerosols in Beijing(2 Method-5 simulation,General Presentations)

  MORINO Yu, OHARA Toshimasa, HASEGAWA Shuichi, FUSHIMI Akihiro, KONDO Miyuki, TANABE Kiyoshi, YAMAJI Kazuyo, Zhao B., Xu J., Hao J.

  大気環境学会, 2012, 大気環境学会年会講演要旨集, 53rd(53) (53), 361 - 361, Japanese


• 2C1113 Sensitivity analysis of air quality models to improve performance for PM2.5 nitrate simulation(1 Space-4 urban/area,General Presentations)

  SHIMADERA Hikari, HAYAMI Hiroshi, CHATANI Satoru, MORINO Yu, MORI Yasuaki, MORIKAWA Tazuko, YAMAJI Kazuyo, OHARA Toshimasa

  大気環境学会, 2012, 大気環境学会年会講演要旨集, 53rd(53) (53), 390 - 390, Japanese


• 2E1113 Sensitivity analysis of source regions on PM2.5 concentration at Fukue Island in 2010(1 Space-5 East Asia,General Presentations)

  IKEDA Kohei, YAMAJI Kazuyo, KANAYA Yugo, TAKETANI Fumikazu, Pan Xiaole, KOMAZAKI Yuichi, KUROKAWA Junichi, OHARA Toshimasa

  大気環境学会, 2012, 大気環境学会年会講演要旨集, 53rd(53) (53), 416 - 416, Japanese


• 2E1126 Year-round model analysis of ozone, pm2.5, and their precursors observed at Fukue Island(1 Space-5 East Asia,General Presentations)

  YAMAJI Kazuyo, IKEDA Kohei, KANAYA Yugo, KOMAZAKI Yuichi, PAN Xiaole, UNO Itsushi, KUROKAWA Junichi, OHARA Toshimasa, TANIMOTO Hiroshi, YOKOUCHI Yoko, Li Jie, IRIE Hitoshi, TAKASHIMA Hisahiro

  大気環境学会, 2012, 大気環境学会年会講演要旨集, 53rd(53) (53), 417 - 417, Japanese


• SCIAMACHY,OMI,GOME-2の対流圏NO₂カラム濃度を複合利用したCMAQモデルの評価

  入江仁士, 山地一代, 池田恒平, 鵜野伊津志, 板橋秀一, 大原利眞, 黒川純一

  日本気象学会, 2012, 日本気象学会大会講演予稿集, 102(102) (102), 365 - 365, Japanese


• 2009年福江島における大気物質濃度のモデル解析

  山地一代, LI Jie, 鵜野伊津志, 金谷有剛, 竹谷文一, 駒崎雄一, 谷本浩志, 猪俣敏

  2011, 大気環境学会年会講演要旨集, 52nd


• 日本の遠隔観測地における広域的越境大気汚染のモデル解析

  山地一代, 秋元肇, LI Jie, 鵜野伊津志

  2011, 大気環境学会年会講演要旨集, 52nd


• 領域気象モデルWRFにおける日本域の降水の再現性検証

  池田恒平, 山地一代, 滝川雅之

  日本気象学会, 2011, 日本気象学会大会講演予稿集, 100(100) (100), 504 - 504, Japanese


• Increasing of photochemical oxidants and trans-boundary air pollution over Asia

  Kazuyo YAMAJI

  養賢堂, 2011, ETR, 2(6) (6), 32 - 38,G1, Japanese

  Introduction scientific journal


• 大気汚染の最新の状況「広域大気における光化学オキシダント濃度の増加とアジア諸国の現状および越境大気汚染」

  Kazuyo YAMAJI

  Jun. 2010, 日本機械学会講習会教材, 11 - 16, Japanese

  [Refereed][Invited]

  Introduction scientific journal


• 東アジア地域における広域大気汚染の発生源寄与解析

  山地一代, 鵜野伊津志, 鵜野伊津志, LI Jie

  2010, 大気環境学会年会講演要旨集, 51st


• 領域物質輸送モデルを用いた長崎県福江島における大気汚染解析

  山地一代, JIE Li, 鵜野伊津志, 鵜野伊津志, 金谷有剛, 竹谷文一, 谷本浩志, 猪俣敏

  日本気象学会, 2010, 日本気象学会大会講演予稿集, 98(98) (98), 410 - 410, Japanese


• P144 Role of regional anthropogenic emissions in the summer surface ozone maximum in the northeastern Tibetan Plateau-modeling studies :

  Li Jie, Uno Itsushi, Yamaji Kazuyo, Wang Zifa, Akimoto Hajime, Tang Jie

  日本気象学会, 2009, 大会講演予講集, 96, 376 - 376, English


• 1C1006 Impact of biomass burning in the North China Plain on air quality(1 Space-5 East Asian scale,General Presentations)

  YAMAJI Kazuyo, UNO Itsushi, KANAYA Yugo, KOMAZAKI Yuichi, OHARA Toshimasa, AKIMOTO Hajime

  大気環境学会, 2009, 大気環境学会年会講演要旨集, 50th(50) (50), 244 - 244, Japanese


• 領域物質輸送モデルを用いたCentral East China域における大気汚染物質の変動解析

  山地一代, LI Jie, 鵜野伊津志, 鵜野伊津志, 滝川雅之, 金谷有剛, 駒崎雄一, 大原利眞, 秋元肇

  日本気象学会, 2009, 日本気象学会大会講演予稿集, 96(96) (96), 471 - 471, Japanese


• 東アジアにおけるオゾン前駆物質排出量の経年変化と将来予測

  大原利眞, 黒川純一, 秋元肇, 山地一代, 堀井伸浩, 早坂忠裕

  日本農業気象学会, 2008, 日本農業気象学会全国大会講演要旨, 2008(0) (0), 83 - 83, Japanese


• P-48 Estimation and future projectons of impact on rice yields by surface ozone in China(Poster (Academic Promenade))

  KURIBAYASHI Masatoshi, OHARA Toshimasa, YAMAJI Kazuyo

  大気環境学会, 2008, 大気環境学会年会講演要旨集, 49th(49) (49), 436 - 436, Japanese


• CMAQ/REASによる1980~2003年の東アジアにおける地表オゾンの長期シミュレーション

  大原利眞, 黒川純一, 片山学, 鵜野伊津志, 山地一代, 秋元肇

  2007, 大気環境学会年会講演要旨集, 48th


• 中国泰山集中観測におけるガス・エアロゾル濃度のモデル解析

  山地一代, 大原利眞, 大原利眞, 鵜野伊津志, 金谷有剛, POCHANART Pakpong, LIU Yu, 駒崎雄一, 秋元肇, WANG Zifa

  2007, 大気環境学会年会講演要旨集, 48th


• アジア域の窒素酸化物の増加とそのインパクト

  鵜野伊津志, 大原利眞, 黒川純一, 何友江, 山地一代

  2007, 大気環境学会九州支部総会研究発表会講演要旨集, 7th-19th


• The status quo and future prediction of East Asian ozone pollution learned from recent model studies

  Kazuyo YAMAJI, Hajime Akimoto

  環境コミュニケーションズ, 2007, Journal of resources and environment, 43(7) (7), 28 - 35, Japanese

  Introduction other


• Long-term model-simulated tropospheric NO₂ in Asia and comparison with GOME-satellite data-Combination of bottom-up and top-down analysis-

  UNO Itsushi, HE Youjiang, OHARA Toshimasa, YAMAJI Kazuyo, KUROKAWA Jun-ichi

  2006, 大気環境学会年会講演要旨集, 47th(CD-ROM) (CD-ROM)


• 中国における人為起源排出量のトレンド解析と将来予測

  大原利眞, 秋元肇, 黒川純一, 山地一代, 堀井伸浩, 早坂忠裕

  2006, 大気環境学会年会講演要旨集, 47th(CD-ROM) (CD-ROM)


• アジア域の対流圏NO₂の年々変動・季節変動のモデルシミュレーションと解析

  鵜野伊津志, 大原利眞, 山地一代, 黒川純一

  2006, 大気環境学会年会講演要旨集, 47th(CD-ROM) (CD-ROM)


• 東アジアにおける酸性沈着の長期シミュレーション

  片山学, 大原利眞, 鵜野伊津志, 山地一代, 黒川純一

  2006, 大気環境学会年会講演要旨集, 47th(CD-ROM) (CD-ROM)


• アジア域の物質輸送モデリング-最近の展開-

  鵜野伊津志, 弓本桂也, 大原利眞, 山地一代, 杉本伸夫, 黒川純一

  2006, 大気環境学会年会講演要旨集, 47th(CD-ROM) (CD-ROM)


• 輪島における多環芳香族炭化水素の実測値と化学物質輸送モデルを用いた他の大気汚染物質の計算値との相関比較

  楊小陽, 唐寧, 岡田裕弥, 亀田貴之, 鳥羽陽, 歌野原陽一, 山地一代, 川西琢也, 田村憲治, 大原利眞, 鵜野伊津志, 早川和一

  2006, 大気環境学会年会講演要旨集, 47th(CD-ROM) (CD-ROM)


• 都市スケール化学天気予報システムの開発(2)

  滝川雅之, 山地一代, 秋元肇, 高橋正明

  日本気象学会, 2006, 日本気象学会大会講演予稿集, 90(90) (90), 260 - 260, Japanese


• 東アジアにおける対流圏オゾン濃度の将来予測

  山地一代, 大原利真, 大原利真, 鵜野伊津志, 堀井伸浩, 黒川純一, 秋元肇

  日本気象学会, 2006, 日本気象学会大会講演予稿集, 89(89) (89), 433 - 433, Japanese


• 中国東部におけるオゾン汚染:モデルシミュレーションおよび観測

  POCHANART Pakupon, 秋元肇, 山地一代, OH Zihatu, 鵜野伊津志

  2005, 大気環境学会年会講演要旨集, 46th


• アジア域の大気環境長期シミュレーションとデータベース化

  鵜野伊津志, 大原利真, 山地一代, 谷本浩志, 黒川純一

  2005, 大気環境学会年会講演要旨集, 46th


• 東アジアにおける対流圏オゾンの季節変動

  山地一代, 大原利真, 鵜野伊津志, 谷本浩志, 黒川純一, 秋元肇

  2005, 大気環境学会年会講演要旨集, 46th


• 国内の大気質に及ぼす越境汚染と気候変化の影響

  大原利真, 村野健太郎, 谷本直隆, 山地一代, 鵜野伊津志

  2005, 大気環境学会年会講演要旨集, 46th


• 1980~2000年におけるアジア域エミッションインベントリの構築

  大原利真, 大原利真, 秋元肇, 黒川純一, 堀井伸浩, 山地一代, 顔暁元, 早坂忠裕

  2005, 大気環境学会年会講演要旨集, 46th


• 2001年春季東アジア域におけるオゾンのシミュレーション

  山地一代, 大原利真, 鵜野伊津志, 秋元肇

  2004, 大気環境学会年会講演要旨集, 45th


• RAMS/CMAQ物質輸送モデルを用いたアジア域の通年シミュレーション

  鵜野伊津志, 大原利真, 菅田誠治, 黒川純一, 古橋規尊, 山地一代

  2004, 大気環境学会年会講演要旨集, 45th


• P26 Study of CH4 and N2O emission from domestic livestock in Asia

  Yamaji Kazuyo, Ohara Toshimasa, Akimoto Hajime

  大気環境学会, 2002, 大気環境学会年会講演要旨集, (43) (43), 496 - 496, Japanese


• Theoretical Studies for the Solvent Dependence of Structure, Reaction, and Isotope Effect of the Solvated Lithium Ion.

  渡辺秀和, 山地一代, 加納博文, 大井健太

  2001, 日本化学会講演予稿集, 79th(1) (1)


• Theoretical studies for the solvent dependence of the structures and isotope exchange reaction of the solvated lithium ion.

  渡辺秀和, 山地一代, 加納博文, 大井健太

  2001, 化学反応討論会講演要旨集, 17th


• 1J1430 Development of emission inventories for atmospheric trace constituents in Asia (1)

  Ohara T., Akimoto H., Yamaji K., Kurokawa J., Streets David

  大気環境学会, 2001, 大気環境学会年会講演要旨集, (42) (42), 403 - 403, Japanese


• P38 Study of CH_4 emission from domestic livestock in Asia

  Yamaji K., Ohara T., Yan X., Akimoto H.

  大気環境学会, 2001, 大気環境学会年会講演要旨集, 42nd(42) (42), 453 - 453, Japanese


• ab initio法によるホウ素同位体分離係数の予測

  苑田晃成, 山地一代, 渡辺秀和, 槙田洋二, 加納博文, 広津孝弘

  2000, 計算化学討論会講演要旨集, 2000


• Micrometeorology and physiological characteristics of plants in the doline named Rashohmon.

  米谷俊彦, 宮下晃一, 山地一代, 田中丸重美, SHAW R H, 柏木良明

  1999, 羅生門自然環境保護・保全調査報告書 平成11年


• Micrometeorological observation in the doline at Kusama, Niimi City (2).

  米谷俊彦, 宮下晃一, 山地一代, 柏木良明

  1998, 日本農業気象学会全国大会日本生物環境調節学会大会合同大会講演要旨, 1998


• Micrometeorological observation at Rashomon doline in Kusama, Niimi City.

  米谷俊彦, 宮下晃一, 山地一代, SHAW R H, 柏木良明

  1997, 日本農業気象学会全国大会日本生物環境調節学会大会合同大会講演要旨, 1997-35th


• Long-term variations of precipitation in Kagawa.

  森征洋, 山地一代

  Kagawa University, 1997, 香川大学教育学部研究報告 第2部, 47(2) (2), 13 - 21, Japanese

  Introduction other

• 大気環境の事典（大原ら編）

  Kazuyo YAMAJI

  Others, 6-17 東アジアの広域大気汚染：モデル的視点から, 朝倉書店, Sep. 2019, Japanese, ISBN: 9784254180541

  Dictionary or encycropedia


• 図説地球環境の事典（吉崎ら編）

  Kazuyo YAMAJI

  Others, 4.14 エミッション・インベントリ, 朝倉書店, Sep. 2013, Japanese, ISBN: 9784254160598

  Dictionary or encycropedia

• Study on spatio-temporal variations of black carbon concentrations over the Arctic region using a Northern Hemisphere scale chemical transport simulation

  Kazuyo Yamaji

  応用力学研究所 研究集会・第8回アジア域の化学輸送モデルの現状と今後の展開に関する研究集会, Feb. 2025, Japanese

  Oral presentation


• 春季北極圏BC濃度の高度分布に対するバイオマスバーニングの影響

  西山朋輝, 山地一代, 矢原京馬, 日本気象協, 竹谷文一, 滝川雅之, 金谷有剛, 大畑祥, 近藤豊, 小池真

  2024 年度大気環境学会近畿支部研究発表会, Dec. 2024


• 大気境界層過程の差異が大気質モデルによるオゾン濃度経年変化の再現性に及ぼす影響

  山本果蓮, 伊藤和一朗, 荒木真, 茶谷聡, 北山響, 板橋秀一, 山地一代, 櫻井達也, 松尾智仁, 嶋寺光

  2024 年度大気環境学会近畿支部研究発表会, Dec. 2024, Japanese

  Oral presentation


• 気象タイプ別の降水中の化学成分比の地域的特徴

  井上凜子, 山地一代

  2024 年度大気環境学会近畿支部研究発表会, Dec. 2024, Japanese

  Oral presentation


• 衛星観測と地上観測間にみられるメタン濃度変動の差異要因について

  古藤千寛, 山地一代, 金谷有剛

  2024 年度大気環境学会近畿支部研究発表会, Dec. 2024, Japanese

  Oral presentation


• 航空機観測よりみられる北極圏BC濃度の高度分布特性

  西崎馨, 山地一代, Thi Minh Phuc HA, 金谷有剛

  2024 年度大気環境学会近畿支部研究発表会, Dec. 2024, Japanese

  Oral presentation


• Impact of CRB emission on PM2.5 concentration over Northwest India using multiple emission scenarios by WRF-Chem

  Akash Biswal, Masayuki Takigawa, Jagat Bish, Poonam Mongaraj, Prabir Kumar Patra, Mizuo Kajino, Kazuyo Yamaji, Yutaka Matsumi, Tomoki Nakayama, Sachiko Hayashida, Natsuko Yasutomi, Hikaru Araki

  AGU24, Dec. 2024, English

  Poster presentation


• 黒色炭素表面上の不均一反応過程が 東アジア域の対流圏オゾン濃度に与える影響

  板橋秀一, 金谷有剛, 茶谷聡, 山地一代, 嶋寺光, 櫻井達也, 永島達也, 池田恒平, 谷本浩志

  第29回大気化学討論会(2024), Oct. 2024, English

  Oral presentation


• 部インド洋での大気微量成分船舶観測：モデル計算との比較・発生源寄与評価

  竹谷文一, 山地一代, 関谷高志, 岩本洋子, 金谷有剛

  第29回大気化学討論会(2024), Oct. 2024, Japanese

  Poster presentation


• 2015年北極圏BC濃度に対するバイオマス燃焼起源排出の影響

  西山 朋輝, 山地 一代, 矢原 京馬, 竹谷 文一, 滝川 雅之, 金谷 有剛, 大畑 祥, 近藤 豊, 小池 真

  第29回大気化学討論会(2024), Oct. 2024, Japanese

  Oral presentation


• 関東の光化学オキシダントを対象としたモデル間比較研究

  入澤大悟, 櫻井達也, 茶谷聡, 山地一代, 嶋寺光, 板橋秀一, 湯山強

  第65回大気環境学会年会, Sep. 2024


• Measurements of PM2.5 during kharif rice crop residue burning (2022- 2023) by low-cost sensor network in Punjab, Haryana and Delhi-NCR

  Poonam Mangaraj, Yutaka Matsumi, Akash Biswal, Kazuyo Yamaji, Masayuki Takigawa, Hikaru Araki, Natsuko Yasutomi, Tomoki Nakayama, Prabir K. Patra, Sachiko Hayashida, Akanksha Sharma, A. P. Dimri, Surendra K. Dhaka, Manpreet S. Bha, Mizuo Kajino, Ravi K. Kunchal, Vimal J. Vazhathara, Prakhar Misra, Tanbir Sing

  2024 iCACGP-IGAC Joint Conference, Sep. 2024, English

  Oral presentation


• Modeling study for the heavy PM2.5 pollution during the dry season in northwestern India.

  Kazuyo Yamaji, Sayaka Tsuji, Mizuo Kajino, Sachiko Hayashida, Natsuko Yasutomi, Hikaru Araki, Akash Biswal, Poonam Mangaraj, Yutaka Matsumi, Tomoki Nakayama, Masayuki Takigawa, Tanbir Singh, Prabir K. Patra

  2024 iCACGP-IGAC Joint Conference, Sep. 2024, English

  Poster presentation


• Biomass-burning and anthropogenic emissions of black carbon, CO, and CO2 from South East Asia and China: an integrated analysis of Regional Air Quality Model (CMAQ) and EMeRGe-Asia aircraft observations during early spring 2018

  Phuc Thi Minh Ha, Yugo Kanaya, Kazuyo Yamaji, Takashi Sekiya, Maria Dolores, Andrés Hernández, John Philip Burrows, Hans Schlager, Michael Lichtenstern, Mira Poehlker, Bruna Holanda, EMeRGe-Asia science team

  2024 iCACGP-IGAC Joint Conference, Sep. 2024, English

  Poster presentation


• Modelling study for the heavy PM2.5 polluBon during the dry season in northwestern India

  Kazuyo Yamaji

  Aakash International Workshop 2024, Aug. 2024, English

  Oral presentation


• 2018年4月の黄砂イベントに対するモデル相互比較実験

  板橋秀一, 嶋寺光, 山地一代, 櫻井達也, 茶谷聡

  第41回エアロゾル科学・技術研究討論会, Aug. 2024


• Global Sulfur Cap 2020 による表層大気質の改善効果について

  山地一代

  北海道大学低温科学研究所 令和6年度共同利用研究集会, Aug. 2024, Japanese

  [Invited]

  Invited oral presentation


• China's black carbon, CO, and CO2 emissions from integrated analysis of the Regional Air Quality Model (CMAQ) and EMeRGe-Asia aircraft observations during early spring 2018

  Phuc Thi Minh Ha, Yugo Kanaya, Kazuyo Yamaji, Takashi Sekiya, Maria Dolores, Andrés Hernández, John Philip Burrows, Hans Schlager, Michael Lichtenstern, Mira Poehlker, Bruna Holanda, EMeRGe-Asia science team

  Japan Geoscience Union Meeting 2024, May 2024, English

  Oral presentation


• Studies of chemical evolution of crop residue burning plume in northwest India based on sensor network observations: Secondary formation of PM2.5 and loss of NOx

  Tomoki Nakayama, Yutaka Matsumi, Tanbir Singh, Hikaru Araki, Natsuko Yasutomi, Akash Biswal, Poonam Mangaraj, Sachiko Hayashida, Mizuo Kajino, Kazuyo Yamaji, Prabir Patra

  Japan Geoscience Union Meeting 2024, May 2024, English

  Oral presentation


• Overview of an Intensive Observation Campaign for Quantification of Air Pollution from Agricultural Residue Burning in Northwestern India.

  Yasutomi Natsuko, Prabir Patra, Sachiko Hayashida, Yutaka Matsumi, Tomoki Nakayama, Hikaru Araki, Mizuo Kajino, Kazuyo Yamaji, Poonam Mangaraj, Akash Biswal, Ryoichi Imasu, Rumiko Murao

  Japan Geoscience Union Meeting 2024, May 2024, English

  Oral presentation


• Multiyear comparison of WRF-Chem simulated PM2.5 with the widespread in-situ observation network during the autumn crop residue burning over North-west India

  Akash Biswal, Yutaka Matsumi, Prabir Patra, Takigawa Masayuki, Jagat Bish, Tomoki Nakayama, Poonam Mangaraj, Sachiko Hayashida, Natsuko Yasutomi, Hikaru Araki, Mizuo Kajino, Kazuyo Yamaji

  Japan Geoscience Union Meeting 2024, May 2024, English


• Numerical analysis of PM pollution after Kharif-crop harvest over the Delhi-Haryana-Punjab region by combining regional model simulations and field observations

  Kazuyo Yamaji, Sayaka Tsuji, Mizuo Kajino, Sachiko Hayashida, Tanbir Singh, Natsuko Yasutomi, Hikaru Araki, Akash Biswal, Poonam Mangaraj, Yutaka Matsumi, Tomoki Nakayama, Masayuki Takigawa, Prabir Patra

  Japan Geoscience Union Meeting 2024, May 2024, English

  Oral presentation


• Impact of autumn crop residue burning on PM2.5 over North India using a meteorology-chemistry model, a high-density surface observation network, and inverse modeling

  Mizuo Kajino, Kentaro Ishijima, Joseph Ching, Kazuyo Yamaji, Rio Ishikawa, Tomoki Kajikawa, Tomoki Nakayama, Yutaka Matsumi, Prabir Patra, Sachiko Hayashida

  Japan Geoscience Union Meeting 2024, May 2024, English

  Oral presentation


• Unravelling the link between air pollution in Delhi and Rice Crop Residue Burning in Punjab and Haryana during 2022 and 2023 field campaign

  Poonam MangarajYutaka, MatsumiAkash BiswalKazuyo, YamajiMasayuki TakigawaHikaru ArakiNatsuko, YasutomiTomoki NakayamaPrabir, K, PatraSachiko, HayashidaAkansha SharmaA., P DimriSurendra K DhakaManpreet S BhattiMizuo, KajinoSanjeev BhardwaRavindra KhaiwaSuman MorRavi K Kunchala、Vimal J Vazhathara、Tuhin K MandalPrakhar MishraTanbir SinghKamal Vatta

  Japan Geoscience Union Meeting 2024, May 2024, English

  Oral presentation


• Development and installation of a network of low-cost instruments (32 units, PM2.5, CO and O3) to study rice straw burning impact in north-west India

  Yutaka Matsumi, Tomoki Nakayama, Prabir Patra, Sachiko Hayashida, Akash Biswal, Poonam Mangaraj, Natsuko Yasutomi, Hikaru Araki, Mizuo Kajino, Kazuyo Yamaji, Tanbir Singh

  Japan Geoscience Union Meeting 2024, May 2024, English

  Oral presentation


• デリー首都圏および周辺地域におけるPM2.5濃度上昇を対象とした数値解析

  山地一代

  九州大学応用力学研究所研究集会 第7回アジア域の化学輸送モデルの現状と今後の展開に関する研究集会, Mar. 2024


• Influence of Atmospheric Nitrogen Nutrient Dry and wet Deposition on Surface Primary Productivity at the subtropical western North Pacific.

  Fumikazu TAKEANI, Kazuhiko MATSUMOTO, Takashi SEKIYA, Kazuyo YAMAJI, Yugo KANAYA

  Ocean Sciences Meeting (OSM), English

  Poster presentation


• NASA ATom 航空機観測よりみられるBCの分布特性について

  亀井瑛世, 山地一代

  2023年度 大気環境学会近畿支部研究発表会, Dec. 2023, Japanese

  Oral presentation


• デリー首都圏におけるPM2.5濃度上昇とインド北西部の稲藁焼きの関連性

  辻彩弥加, 山地一代, 林田佐智子, 梶野瑞王, Tanbir Singh, 松見豊, 中山智喜, 荒木晶, 安富奈津子, Prabir K. Patra, Aakashプロジェクトメンバー

  2023年度 大気環境学会近畿支部研究発表会, Dec. 2023, Japanese

  Oral presentation


• Insights into China’s Black Carbon, CO, and CO2 Emissions from Integrated Analysis of the Regional Air Quality Model (CMAQ) and EMeRGe-Asia Aircraft Observations during Early Spring 2018

  Phuc Thi Minh Ha, Yugo Kanaya, Kazuyo Yamaji, Takashi Sekiya, Maria Dolores, Andrés Hernández, John Philip Burrows, Hans Schlager, Michael Lichtenstern, Mira L. Pöhlker, Bruna A. Holanda, EMeRGe-Asia science team

  AGU23, Dec. 2023, English

  Oral presentation


• PM2.5, CO, O3, NOxの小型大気観測器の開発とインドでの稲わら焼きの広域の大気環境影響のネットワーク観測

  松見豊, 中山智喜, Tanbir Singh, 荒木晶, 安富奈津子, 林田佐智子, 梶野瑞王, 山地一代, Prabir K. Patra, Aakashプロジェクトメンバー

  JpSAC Annual Meeting 2023, Nov. 2023


• インド北西部での稲わら焼き起源PM2.5の二次生成過程の解明

  中山智喜, 松見豊, Tanbir Singh, 荒木晶, 安富奈津子, 林田佐智子

  JpSAC Annual Meeting 2023, Nov. 2023


• 西部北太平洋亜熱帯海域における大気栄養塩供給の海洋表層基礎生産への影響評価

  竹谷文一, 松本和彦, 山地一代, 関谷高志, 金谷有剛

  JpSAC Annual Meeting 2023, Nov. 2023


• An integrated analysis of the Regional Air Quality Model (CMAQ) and EMeRGe-Asia aircraft observations during early spring 2018 provides information on China's black carbon, CO, and CO2 emissions.

  Phuc T. M. Ha, Yugo Kanaya, Kazuyo Yamaji, Takashi Sekiya, Maria Dolores, Andrés Hernández, John Philip Burrows, Hans Schlager, Michael Lichtenstern, Mira Poehlker, Bruna Holanda, EMeRGe-Asia science team

  JpSAC Annual Meeting 2023, Nov. 2023


• インド北西部の藁焼きによる深刻な大気汚染状況のモデル解析

  山地一代, 林田佐智子, 梶野瑞王, Tanbir Singh, 松見豊, 中山智喜, 荒木晶, 安富奈津子, Prabir K. Patra, Aakashプロジェクトメンバー

  JpSAC Annual Meeting 2023, Nov. 2023


• Study on the reproducibility of atmospheric black carbon by atmospheric models due to comparison with observed concentrations of PM2. 5 components at Japan monitoring stations

  Reina Yuasa, Kazuyo Yamaji, Satoru Chatani, Hikari Shimadera, Syuichi Itahashi, Tatsuya Sakurai, Yugo Kanaya

  Japan Geoscience Union Meeting 2023, Sep. 2023, Japanese, Domestic conference

  Oral presentation


• Study on the predictability of secondary particulate matters based on model intercomparisons

  Kazuyo Yamaji, Reina Yuasa, Satoru Chatani, Hikari Shimadera, Syuichi Itahashi, Tatsuya Sakurai

  第64回大気環境学会年会, Sep. 2023, Japanese, Domestic conference

  Oral presentation


• NUMERICAL ANALYSIS OF THE HEAVILY AIR POLLUTIONS POST HARVEST OVER NORTH-WEST INDIA BY USING REGIONAL MODEL

  Kazuyo Yamaji, Tanbir Singh, Sachiko Hayashida, Natsuko Yasutomi, Hikaru Araki, Mizuo Kajino, Prabir K. Patra, Masayuki Takigawa, Yutaka Matsumi, Tomoki Nakayama, Aakash project science team

  CMAS-Asia-Pacific, Jul. 2023, English, International conference, Co-authored internationally

  Oral presentation


• PERFORMANCE COMPARISON OF THE REGIONAL AIR QUALITY MODEL CMAQ WITH PHOTOCHEMICAL GRID MODEL CAMx DURING THE EMERGE-ASIA AIRCRAFT OBSERVATIONS IN SPRING 2018

  Phuc Thi Minh Ha, Yugo Kanaya, Kazuyo Yamaji, Syuichi Itahashi, Takashi Sekiya, Maria Dolores, Andrés Hernández, John Philip Burrows, Mira Poehlker, Bruna Holanda, Hans Schlager, Michael Lichtenstein, EMeRGe-Asia science team

  CMAS-Asia-Pacific, Jul. 2023, English, International conference, Co-authored internationally

  Poster presentation


• Performance evaluation of the Regional Air Quality Model CMAQ during the EMeRGe-Asia aircraft observations in spring 2018

  Phuc Thi Minh Ha, Yugo Kanaya, Takashi Sekiya, Kazuyo Yamaji, Andrés Maria Dolores Hernández, John Philip Burrows, Helmut Ziereis, Paul Stock, Hans Schlager, Michael Lichtenstern, Mira Poehlker, Bruna Holanda, EMeRGe-Asia science team

  Japan Geoscience Union Meeting 2023, May 2023, English

  Poster presentation


• Assessing the potential impact due to the sea surface temperature changes on the heavy rainfall event in July, 2018

  Koto Sugimoto, Kazuyo Yamaji

  Japan Geoscience Union Meeting 2023, May 2023, Japanese

  Poster presentation


• Controlling factors of temporal variations of black carbon concentration over the Arctic region

  Kyoma Yahara, Tomoki Nishiyama, Kazuyo Yamaji, Fumikazu Taketani, Masayuki Takigawa, Yugo Kanaya

  Japan Geoscience Union Meeting 2023, May 2023, Japanese

  Oral presentation


• Impact of Atmospheric Nitrogen Nutrient Dry Deposition on Surface Primary Productivity over the subtropical western North Pacific

  Fumikazu Taketani, Kazuhiko Matsumoto, Takashi Sekiya, Kazuyo Yamaji, Yugo Kanaya

  Japan Geoscience Union Meeting 2023, May 2023, Japanese

  Poster presentation


• Long-term black carbon observations on Fukue Island, Japan revealed rapid emission reduction from China and dominance of residential sector

  Kanaya Y, Yamaji K, Miyakawa T, Taketani F, Zhu C, Choi Y, Ikeda K, Tanimoto H, Yamada D, Narita D, Kondo Y, Klimon

  10th International Conference on Acid Deposition, ACID RAIN 2020, English

  Oral presentation


• Evaluation of black carbon in the Arctic region using the WRF/CMA4 simulation on the Northern Hemisphere scale

  K. Yahara, K. Yamaji, F. Taketani, M. Takigawa, Y. Kanaya

  Seventh International Symposium on Arctic Research (ISAR-7), Mar. 2023, English


• Synthesis of bottom-up and observation-based black carbon emission estimates from China, Japan and Korea as Observer States of Arctic Council

  Y. Kanaya, K. Yamaji, T. Miyakawa, F. Taketani, C. Zhu, Y. Choi, K. Ikeda, H. Tanimoto, D. Yamada, D. Narita, Y. Kondo, Z. Klimon

  Seventh International Symposium on Arctic Research (ISAR-7), Mar. 2023, English

  Oral presentation


• 東アジア域を対象とした大気質モデルの 物質濃度(PM2.5,BC)の再現性などについて

  山地一代

  九州大学応用力学研究所研究集会 第6回アジア域の化学輸送モデルの現状と今後の展開に関する研究集会, Mar. 2023, Japanese

  Oral presentation


• 2018年7月豪雨を対象とした海面温度モデル感度解析

  杉本小都, 山地一代

  2022年度 大気環境学会近畿支部研究発表会, Dec. 2022, Japanese

  Oral presentation


• 再解析データMERRA-2を用いた北極域ブラックカーボン濃度の時空間変動解析

  西山朋輝, 矢原京馬, 山地一代

  2022年度 大気環境学会近畿支部研究発表会, Dec. 2022, Japanese

  Oral presentation


• 兵庫県赤穂市におけるNOx・VOC排出量削減に伴う光化学オキシダント濃度変化の解析

  新治祐太, 山地一代, 茶谷聡

  第27回大気化学討論会, Nov. 2022, Japanese

  Oral presentation


• インド北部の藁焼きがもたらす大気環境への影響評価

  山地 一代, 林田 佐智子, 梶野 瑞王

  第63回 大気環境学会年会, Sep. 2022

  Oral presentation


• 関東領域における二次汚染物質を対象とした大気質モデルの相互比較検証に関する研究

  阿部 健太郎, 櫻井 達也, 茶谷 聡, 山地 一代, 嶋寺 光, 板橋 秀一, 森川 多津子

  第63回 大気環境学会年会, Sep. 2022

  Poster presentation


• Simulated impacts of agricultural residue burning on autumn air quality in northwestern India

  Mizuo Kajino, Joseph Ching, Kazuyo Yamaji, Rio Ishikawa, Sachiko Hayashid

  Japan Geoscience Union Meeting 2022, May 2022

  Oral presentation


• Modeling analysis of impacts from Kharif crops residue burning on air quality over North India

  Kazuyo Yamaji, Mizuo Kajino, Sachiko Hayashida, Takashi Yoda, Kansuke Sasaki, Moeko Saito, Arisu Kameda

  Japan Geoscience Union Meeting 2022, May 2022

  Oral presentation


• 沖縄県辺戸における対流圏オゾン濃度の年々変動の気象的要因について

  森脇哲人, 山地一代

  2021年度 大気環境学会近畿支部研究発表会, Dec. 2021, Japanese

  Oral presentation


• 兵庫県赤穂市の光化学オキシダントと前駆物質の関係性について

  新治祐太, 山地一代, 茶谷聡

  2021年度 大気環境学会近畿支部研究発表会, Dec. 2021, Japanese

  Oral presentation


• 2017年12月の福岡地方における降水中化学成分濃度の上昇要因について

  竹内大輔, 山地一代

  2021年度 大気環境学会近畿支部研究発表会, Dec. 2021, Japanese

  Oral presentation


• 大阪・京都における窒素酸化物の発生源解析

  湯淺玲奈, 山地一代, 茶谷聡

  2021年度 大気環境学会近畿支部研究発表会, Dec. 2021, Japanese

  Oral presentation


• 降水イベントに対するメソ気象モデルWRFの物理スキームの検討

  杉本小都, 山地一代

  2021年度 大気環境学会近畿支部研究発表会, Dec. 2021, Japanese

  Oral presentation


• 西部北太平洋域における対流圏オゾン濃度の年々変動について

  森脇哲人, 山地一代

  第26回大気化学討論会, Nov. 2021, Japanese

  Oral presentation


• ⻄部北太平洋域における暖候期の対流圏オゾン濃度の年々変動

  森脇哲人, 山地一代

  第62回大気環境学会年会, Sep. 2021, Japanese

  Oral presentation


• Model analysis of the atmospheric aerosol concentrations and depositions by ship-onboard observations over the Eastern Indian Ocean

  Kazuyo Yamaji, Katsuhiro Kawamoto, Moe Tauchi, Yoko Iwamoto, Fumikazu Taketani, Masayuki Takigawa, Prabir K. Patra, Kazuhiko Matsumoto, Makio Honda, Yugo Kanaya, Takashi Sekiya, Maki Noguchi Aita, Tomoki Nakayama, Satoru Chatani, Yutaka Matsumi, Surendra K. Dhaka, Mizuo Kajino, Sachiko Hayashida

  IGAC 2021 Conference, Sep. 2021, English

  Oral presentation


• Vertical structural measures of atmospheric pollutants using XU-S

  Kazuyo Yamaji, Tetsuya Miyakoshi, Satoshi Komatsu, Isao Kanda

  Japan Geoscience Union Meeting 2021, Jun. 2021, English

  Poster presentation


• 日本の遠隔サイトにおける対流圏オゾンの長期変動について

  森脇哲人, 山地一代

  2020年度 大気環境学会近畿支部研究発表会, Dec. 2020, Japanese


• 瀬戸内海及び周辺地域における2020年以降の大気汚染物質の動態変動:船舶排ガス規制とCOVID-19流行の影響評価

  田内萌絵, 川本雄大, 山地一代, 中坪良平, 大下佳恵, 板野泰之, 平木隆年, 高石豊

  2020年度 大気環境学会近畿支部研究発表会, Dec. 2020, Japanese

  Oral presentation


• 中国の排出規制に伴う日本の降水中化学成分濃度の経年変化

  竹内大輔, 山地一代

  2020年度 大気環境学会近畿支部研究発表会, Dec. 2020, Japanese


• 淀川流域における光化学オキシダント濃度の時空間変動

  新治祐太, 山地一代

  2020年度 大気環境学会近畿支部研究発表会, Dec. 2020, Japanese

  Oral presentation


• 北極域にて観測されたBC濃度の経年変動の要因

  矢原京馬, 山地一代

  2020年度 大気環境学会近畿支部研究発表会, Dec. 2020, Japanese

  Oral presentation


• Detection of significant change in nitrogen oxides concentration and emission during COVID-19 lockdown in North India

  P. Misra, M. Takigawa, P. Khatri, S. K. Dhaka, A.P. Dimri, K. Yamaji, M. Kajino, W. Takeuchi, R. Imasu, P. K. Patra, S. Hayashida

  AGU Fall Meeting 2020 (Online), Dec. 2020


• Model analysis of atmospheric concentrations and depositions on the Eastern Indian Ocean observed by R/V Hakuho Maru

  Kazuyo Yamaji, Katsuhiro Kawamoto, Moe Tauchi, Yoko Iwamoto, Kazuhiko Matsumoto, Makio Honda, Yugo Kanaya, Takashi Sekiya, Maki Noguchi Aita, Tomoki Nakayama, Satoru Chatani, Fumikazu Taketani

  JpGU - AGU Joint Meeting 2020


• 日本海における大気窒素化合物の沈着が海洋表層生態系に与える影響

  竹谷 文一, 相田 真希, 関谷 高志, 山地 一代, 池田 恒平, 本多 牧生, 松本 和彦, 笹岡 晃征, 金谷 有剛

  JpGU - AGU Joint Meeting 2020


• Atmospheric Nitrogen Deposition to the Eastern Indian Ocean and Its Implication for Primary Production岩本 洋子1、川本 雄大3、松本 和彦2、本多 牧生2、金谷 有剛2、関谷 高志2、相田 真希2、山地 一代3、竹谷 文一2

  岩本 洋子, 川本 雄大, 松本 和彦, 本多 牧生, 金谷 有剛, 関谷 高志, 相田 真希, 山地 一代, 竹谷 文一

  JpGU - AGU Joint Meeting 2020


• Impacts of ship emissions on atmospheric particulate matter and gaseous components over the Seto Inland Sea areas

  Moe Tauchi, Katsuhiro Kawamoto, Kazuyo Yamaji, Ryohei Nakatsubo, Yoshie Oshita, Yasuyuki Itano

  JpGU - AGU Joint Meeting 2020, English


• The impact of aerosols on primary productivity in the oligotrophic ocean based on the field observation

  松本 和彦, 竹谷 文一, 岩本 洋子, 山地 一代, 本多 牧生

  JpGU - AGU Joint Meeting 2020, Japanese


• Emissions, transport, and removal of atmospheric black carbon particles: Synthetic analyses of observations from Asia to the Arctic Ocean

  Y. Kanaya, F. Taketani, T. Miyakawa, C. Zhu, H. Kobayashi, Y.-W. Kim, P. Mordovskoi, T. Maximov, Y. Choi, K. Yamaji, K. Ikeda, H. Tanimoto, M. Takigawa, H. Matsui, Y. Kondo, Z. Klimont

  Sixth International Symposium on Arctic Research, Mar. 2020, English


• WRF/CMAQを用いた広域大気質濃度の評価

  Kazuyo Yamaji

  九州大学応用力学研究所研究集会 第4回アジア域の化学輸送モデルの現状と今後の展開に関する研究集会, Feb. 2020


• Potentials of Deposition of Atmospheric Inorganic Nitrogen Compounds to the Surface Marine Ecosystem at Sea of Japan

  Fumikazu Taketani, Maki Noguchi Aita, Kazuyo Yamaji, Takashi Sekiya, Kohei Ikeda, Kosei Sasaoka, Makio C Honda, Kazuhiko Matsumoto, Yugo Kanaya

  OCEAN SCIENCES MEETING 2020, Jan. 2020, English


• Atmospheric Nitrogen Deposition to the Eastern Indian Ocean during Boreal Autumn

  Yoko Iwamoto, Katsuhiro Kawamoto, Fumikazu Taketani, Yugo Kanaya, Takashi Sekiya, Maki Noguchi Aita, Kazuyo Yamaji

  OCEAN SCIENCES MEETING 2020, Jan. 2020, English


• Field Evidences for the Positive Effects of Atmospheric Deposition on Primary Productivity in the Oligotrophic Ocean

  Kazuhiko Matsumoto, Fumikazu Taketani, Kazuyo Yamaji, Yoko Iwamoto, Makio C Hond

  OCEAN SCIENCES MEETING 2020, Jan. 2020, English


• Reduction of air pollutants over North-West India observed from space during the Covid-19 lockdown period

  Hayashida, S, P. Misra, K. Nitta, T. H. Nguyen, P. K. Patra, M. Takigawa, P. Khatri, S. K. Dhaka, A. P. Dimri, K. Yamaji, M. Kajino, W. Takeuchi

  AGU fall meeting 2020, 2020


• 北極海航路航行船舶に起因する大気汚染物質排出量の年々変動に関する研究

  Masashi Tabuchi, Kazuyo Yamaji

  2019年度 大気環境学会近畿支部研究発表会, Dec. 2019, Japanese

  Oral presentation


• 春季福江における大気汚染物質濃度のモデル再現性について

  Tetsuto Moriwaki, Kazuyo Yamaji, Satoru Chatani, Yugo Kanaya

  2019年度 大気環境学会近畿支部研究発表会, Dec. 2019, Japanese

  Oral presentation


• 大気質モデルの現状と課題

  Kazuyo Yamaji

  2019年度 大気環境学会近畿支部研究発表会, Dec. 2019, Japanese

  [Invited]

  Invited oral presentation


• Mutual comparison of source sensitivities and apportionments obtained by BFM, DDM, and ISAM on PM2.5 and ozone concentrations over Japan

  Satoru Chatani, Hikari Shimadera, Syuichi Itahashi, Kazuyo Yamaji

  2019 CMAS Conference, Oct. 2019, English


• 中国の農業残渣焼却が与える大気汚染への影響分析

  呂曉萍, Sachiko Hayashida, Kazuyo Yamaji

  第24回大気化学討論会, Oct. 2019, Japanese


• 乾季の東部インド洋における大気汚染物質の変動

  川本雄大, 田内萌絵, 山地一代, 岩本洋子, 竹谷文一, 金谷有剛, 関谷高志, 野口真希, 中山智喜

  第24回大気化学討論会, Oct. 2019, Japanese


• 大気二次汚染物質を対象とした大気質モデル間相互比較

  山地一代, 茶谷聡, 板橋秀一, 嶋寺光, 滝川雅之, 櫻井達也, 速水洋

  第24回大気化学討論会, Oct. 2019, Japanese


• 中国からのブラックカーボン排出量急減：長崎県福江島における10年間観測からの証拠

  金谷有剛, 山地一代, 宮川拓真, 竹谷文一, 朱春茂, Yongjoo Choi, 池田恒平, 近藤豊

  第24回大気化学討論会, Oct. 2019, Japanese


• Atmospheric deposition flux of inorganic nitrogen into the Eastern Indian Ocean during boreal autumn

  Iwamoto Yoko, Kawamoto Katsuhiro, Taketani Fumikazu, Kanaya Yugo, Noguchi―Aita Maki, Sekiya Takashi, Yamaji Kazuyo

  Abstracts of Annual Meeting of the Geochemical Society of Japan, Sep. 2019, Japanese, GEOCHEMICAL SOCIETY OF JAPAN,


• 大気質モデルの現状と課題〜J-STREAM の結果より

  Kazuyo Yamaji

  第60回 大気環境学会年会 大気環境モデリング分科会, Sep. 2019, Japanese


• Recent trends in atmospheric pollution over Fukue, a western island of Japan

  Kazuyo yamaji, Tomoki Hirayama, Yugo Kanaya

  The Workshop on Air Quality and Climate Research Across Scales, Jul. 2019, English


• Influence of Deposition of Atmospheric Inorganic Nitrogen Compounds to Marine Ecosystem at Bay of Bengal

  Fumikazu TAKETANI, Maki AIDA, Kazuyo YAMAJI, Takashi SEKITA, Kohei IKEDA, HASHIMOTO, Taketo HASHIOKA, Makio HONDA, Kazuhiko MATSUMOTO, Yugo KANAYA

  Japan Geoscience Union Meeting 2019, May 2019, English

  Poster presentation


• 大気質モデルによるオゾンの濃度分布推定

  Kazuyo Yamaji

  大気環境学会近畿支部3部会合同講演会「オキシダントの大気環境動態と植物影響」, May 2019, Japanese

  [Invited]

  Invited oral presentation


• J-stream: Model inter-comparison study for urbanized area in Japan

  Kazuyo YAMAJI

  10th International Workshop on Atmospheric Modeling Research in East Asia, Mar. 2019, English, Jinhua, China, International conference

  Oral presentation


• 練習船深江丸で観測された瀬戸内海周辺地域におけるPM2.5の空間的・時間的変化

  Katsuhiro KAWAMOTO, Kazuyo YAMAJI, Mitsuru HAYASHI, Ryohei NAKATSUBO, Yasuyuki ITANO, Katsuhiko YAMAMOTO, Masashi WADA

  日本エアロゾル学会「大気-海洋境界層における大気物質の役割-現場観測の視点から-」, Jan. 2019, Japanese, 東京理科大学, Domestic conference

  Poster presentation


• 数値計算を利用したアジア大陸から高緯度へのブラックカーボン長距離輸送：みらい北極航海（MR1503航海）時の解析

  Kazuyo YAMAJI, Fumikazu TAKETANI, 田渕 将司, Masayuki TAKIGAWA, Satoshi CHATANI

  日本エアロゾル学会「大気-海洋境界層における大気物質の役割-現場観測の視点から-」, Jan. 2019, Japanese, 東京理科大学, Domestic conference

  Poster presentation


• アジア域地表O3濃度過大評価における洋上消失過程の有用性の検討

  Souma SHINTANI, Kazuyo YAMAJI, Satoshi CHATANI, Hikari SHIMADERA

  日本エアロゾル学会「大気-海洋境界層における大気物質の役割-現場観測の視点から-」, Jan. 2019, Japanese, 東京理科大学, Domestic conference

  Poster presentation


• 福江・辺戸におけるNO2鉛直カラム濃度の長期変動傾向

  Tomoki HIRAYAMA, Yugo KANAYA, Kazuyo YAMAJI

  2018年度大気環境学会近畿支部第7回研究発表会, Dec. 2018, Japanese, 大阪府立大学なんばセンター, Domestic conference

  Oral presentation


• 深江丸による海上観測と常時監視測定局データの比較による瀬戸内地域のPM2.5汚染解析

  Katsuhiro KAWAMOTO, Kazuyo YAMAJI, Ryohei NAKATSUBO, Yasuyuki ITANO, Katsuhiko YAMAMOTO, 和田 匡司, Mitsuru HAYASHI

  第4回海洋環境研究集会, Dec. 2018, Japanese, Kobe University, Domestic conference

  Oral presentation


• アジア域地表O3濃度過大評価における洋上消失過程の有用性の検討

  Soma SHINTANI, Kazuyo YAMAJI, Satoshi CHATANI, Hikari SHIMADERA

  大気環境学会近畿支部第7回研究発表会, Dec. 2018, Japanese, 大阪府立大学なんばセンター, Domestic conference

  Oral presentation


• 2017年5月の黄砂飛来時における粒子物質のモデル再現性の評価

  Miho SAKAGUCHI, Kazuyo YAMAJI, Satoru CHATANI

  大気環境学会近畿支部第7回研究発表会, Dec. 2018, Japanese, 大阪府立大学なんばセンター, Domestic conference

  Oral presentation


• 中国の農業残渣焼却が与える大気汚染への影響分析

  Xiaoping RO, Sachiko HAYASHIDA, Kazuyo YAMAJI

  日本気象学会秋季大会, Oct. 2018, Japanese, Sendai International Center (Miyagi), Domestic conference

  Oral presentation


• Model inter-comparison study for urban scale secondary atomospheric pollutants in Japan.

  Kazuyo YAMAJI, Satoru CHATANI, Kyo KITAYAMA, Syuichi ITAHASHI, Hiroshi HAYAMI, Tatsuya SAKURAI, Hikari SHIMADERA, Masayuki TAKIGAWA

  17th Annual Community Modeling and Analysis System(CMAS) Conference, Oct. 2018, English, North Carolina(USA), International conference

  Oral presentation


• 固定発生源の業種別・施設種別・燃料種別汚染物質排出インベントリの構築

  Satoshi CHATANI, Penwadee CHEEWAPHONGPHAN, Shinji KOBAYASHI, Kiyoshi TANABE, Kazuyo YAMAJI, Akinori TAKAMI

  第59回大気環境学会, Sep. 2018, Japanese, Kyushu University Chikushi Campus(Fukuoka・Kasuga), Domestic conference

  Oral presentation


• 揮発性有機化合物排出インベントリの空間分布および未把握発生源の検討

  Satoshi CHATANI, Kazuyo YAMAJI

  第59回大気環境学会, Sep. 2018, Japanese, Kyushu University Chikushi Campus(Fukuoka・Kasuga), Domestic conference

  Oral presentation


• 関西・関東都市域におけるPM2.5濃度再現性向上のための感度解析～粒子状物質の雲底下洗浄過程～

  Shunsuke MATSUI, Hikari SHIMADERA, Kazuyo YAMAJI, Satoru CHATANI, Hitoshi MATSUO, Akira KONDO

  第59回大気環境学会, Sep. 2018, Japanese, Kyushu University Chikushi Campus(Fukuoka・Kasuga), Domestic conference

  Oral presentation


• モデル再現性評価～測定値をモデル再現性の評価に使う際に考えるべきこと～

  Kazuyo YAMAJI, Tatsuya NAGASHIMA, Satoru CHATANI

  The 59th Annual Meeting of Japan Society for Atomospherie Environment, Sep. 2018, Japanese, Kyushu University Chikushi Campus（Kasuga City), Domestic conference

  Oral presentation


• Spatial and temporal changes of atmospheric PM2.5 over the Seto Inland Sea observed on board the training ship Fukaemaru.

  Katsuhiro KAWAMOTO, Kazuyo YAMAJI, Mitsuru HAYASHI, Ryohei NAKATSUBO, Yasuyuki ITANO, Katsuhiro YAMAMOTO, Masashi WADA

  2018 Joint 14th iCACGP Quadrennial Symposium and 15th IGAC Science Conference, Sep. 2018, English, Takamatsu(Kagawa), International conference

  Oral presentation


• Recent trend of atmospheric emissions due to open crop residue burning in the central east China.

  Kazuyo YAMAJI, Xiaoping LU, Sachiko HAYASHIDA

  2018 Joint 14th iCACGP Quadrennial Symposium and 15th IGAC Science Conference, Sep. 2018, English, Takamatsu(Kagawa), International conference

  Oral presentation


• 2016年12月に観測されたPM2.5濃度上昇のモデル再現性について

  Kazuyo YAMAJI, Satoshi CHATANI, Kyo KITAYAMA, Shuichi ITAHASHI, Masahiko SAITO, Masayuki TAKIGAWA, Tazuko MORIKAWA, Isao KANDA, Shigeru WATANABE, Tatsuya SAKURAI, Hikari SHIMADERA, Katsushige URANISHI, Yuzuru FUJIWARA, Seiji SUGATA, Yusuke KIRIYAMA, Hiroo HATA, Shinji SAITO, Makiko YAMAGAMI, Fumikazu IKEMORI, Kunihiro HISATSUNE, Kazuo OSADA, Hiroshi HAYAMI

  第59回大気環境学会, Sep. 2018, Japanese, Kyushu University Chikushi Campus （Fukuoka・Kasuga), Domestic conference

  Oral presentation


• 西部北太平洋域での東アジア由来大気窒素化合物沈着による海洋低次生態系への寄与

  Fumikazu TAKETANI, Maki AITA, Kazuyo YAMAJI, Takashi SEKIYA, Kohei IKEDA, Kosei SASAOKA, Taketo HASHIOKA, Makio HONDA, Kazuhiko MATSUMOTO, Yugo KANAYA

  Japan Geoscience Union 2018, May 2018, Japanese, Makuhari Messe(Chiba), International conference

  Oral presentation


• Sensitivity analysis on factors influencing simulated ambient ozone concentrations over Japan in J-STREAM

  Satoru CHATANI, Hikari SHIMADERA, Kyo KITAYAMA, Kazuyo YAMAJI

  Joint International Conference on the Air Benefit and Cost and Attainment Assessment (ABaCUS) and the Community Modeling and Analysis System (CMAS), May 2018, English, Beijing, China, International conference

  Oral presentation


• Model analysis of long-range transport of black carbon from Asian continent into the high-latitude regions during MIRAI Arctic research cruise

  Kazuyo YAMAJI, Fumikazu TAKETANI, Masashi TABUCHI, Masayuki TAKIGAWA, Satoshi CHATANI

  Japan Geoscience Union 2018, May 2018, English, Makuhari Messe(Chiba), International conference

  Poster presentation


• Inter-comparison of model performance on ambient ozone concentrations over Japan in J-STREAM

  Kyo KITAYAMA, Satoru CHATANI, YAMAJI KAZUYO, Syuichi ITAHASHI, Masahiko SAITO, Masayuki TAKIGAWA, Tazuko MORIKAWA, Isamu KANDA, Yukako MIYA, Hiroaki KOMATSU, Tatsuya SAKURAI, Yu MORINO, Hikari SHIMADERA, Yuzuru FUJIWARA, Hiroshi HAYAMI

  Joint International Conference on the Air Benefit and Cost and Attainment Assessment (ABaCUS) and the Community Modeling and Analysis System (CMAS), May 2018, English, Beijing(China), International conference

  Oral presentation


• Inter-comparison of model performance for PM2.5 and its components over Japan in J-STREAM

  Kazuyo YAMAJI, Satoru CHATANI, Kyo KITAYAMA, Syuichi ITAHASHI, Masahiko SAITO, Masayuki TAKIGAWA, Tazuko MORIKAWA, Isamu KANDA, Yukako MIYA, Hiroaki KOMATSU, Tatsuya SAKURAI, Yu MORINO, Hikari SHIMADERA, Katsushige URANISHI, Yuzuru FUJIWARA, Hiroshi HAYAMI

  Joint International Conference on the Air Benefit and Cost and Attainment Assessment (ABaCUS) and the Community Modeling and Analysis System (CMAS), May 2018, English, Beijing (China), International conference

  Oral presentation


• Response of Marine Ecosystem at North Western Pacific Ocean by Deposition of Atmospheric Inorganic Nitrogen Compounds Produced at East Asia

  Fumikazu TAKETANI, Maki AITA NOGUCHI, Kazuyo YAMAJI, Takashi SEKIYA, Kohei IKEDA, Kosei SASAOKA, Makio C. HONDA, Kazuhiko MATSUMOTO, Yugo KANAYA

  2018 Ocean Sciences Meeting, Feb. 2018, English, Portland, Oregon, USA, International conference

  Poster presentation


• Modelling impacts of riverine and atmospheric nitrogen inputs on marine biogeochemistry

  Maki NOGUCHI AITA, Michio WATANABE, Tomohiro HAJIMA, Fumikazu TAKETANI, Takashi SEKIYA, Kazuyo YAMAJI, Taketo HASHIOKA, Naomi HARADA

  2018 Ocean Sciences Meeting, Feb. 2018, English, Portland, Oregon, USA, International conference

  Poster presentation


• 北半球中緯度から高緯度域へ輸送されるブラックカーボンのモデル解析

  Masashi TABUCHI, Kazuyo YAMAJI, Fumikazu TAKETANI, Masayuki TAKIGAWA, Satoru CHATANI

  日本エアロゾル学会「海洋大気エアロゾル研究会」「大気－海洋境界層における大気物質の役割－数値計算の視点から」, Jan. 2018, Japanese, 東京理科大学, Domestic conference

  Poster presentation


• 西部北太平洋域での大気窒素化合物沈着による海洋低次生態系への寄与

  Fumikazu TAKETANI, Maki Aita NOGUCHI, Kohei IKEDA, Kazuyo YAMAJI, Takashi SEKIYA, Kosei SASAOKA, Kazuhiko MATSUMOTO, Makio C. HONDA, Yugo KANAYA

  日本エアロゾル学会「海洋大気エアロゾル研究会」「大気－海洋境界層における大気物質の役割－数値計算の視点から」, Jan. 2018, Japanese, 東京理科大学, Domestic conference

  Poster presentation


• 春季深江丸研究航海にて観測された瀬戸内海海上PM2.5の濃度変化について

  Katsuhiro KAWAMOTO, Ryotaro KAKIHANA, Kazuyo YAMAJI, Mitsuru HAYASHI, Ryohei NAKATSUBO, Yasuyuki ITANO, Katsuhiko YAMAMOTO, Tadashi WADA

  日本エアロゾル学会「海洋大気エアロゾル研究会」「大気－海洋境界層における大気物質の役割－数値計算の視点から」, Jan. 2018, Japanese, 東京理科大学, Domestic conference

  Poster presentation


• 北半球中緯度から高緯度域へ輸送されるブラックカーボンのモデル解析

  Masashi TABUCHI, Kazuyo YAMAJI, Fumikazu TAKETANI, Masayuki TAKIGAWA, Satoshi CHATANI

  2017年度大気環境学会近畿支部第6回研究発表会, Dec. 2017, Japanese, 大阪府立大学なんばセンター(大阪市), Domestic conference

  Oral presentation


• 深江丸による瀬戸内海海上観測と常時監視測定局データとの比較による瀬戸内地域のPM2.5汚染解析

  Katsuhiro KAWAMOTO, Ryotaro KAKIHANA, Kazuyo YAMAJI, Mitsuru HAYASHI, Ryohei NAKATSUBO, Yasuyuki ITANO, Katsuhiko YAMAMOTO, Masashi WADA

  2017年度大気環境学会近畿支部第6回研究発表会, Dec. 2017, Japanese, 大阪府立大学なんばセンター(大阪市), Domestic conference

  Oral presentation


• 夏季の大阪におけるNOｘ･VOC排出削減によるオゾン濃度に与える影響

  Ryotaro KAKIHANA, Kazuyo YAMAJI, Satoshi CHATANI

  2017年度大気環境学会近畿支部第6回研究発表会, Dec. 2017, Japanese, 大阪府立大学なんばセンター(大阪市), Domestic conference

  Oral presentation


• モデル間相互比較(J-stream)における粒子状物質の再現性について

  Kazuyo YAMAJI

  第3回アジア域の化学輸送モデルの現状と今後の展開に関する研究集会, Dec. 2017, Japanese, RIAM Kyushu University(Kasuga City), Domestic conference

  Oral presentation


• 長崎県福江島および沖縄県辺戸岬におけるNO2カラム濃度変動について

  Tomoki HIRAYAMA, Yugo KANAYA, Kazuyo YAMAJI

  第23回大気化学討論会, Oct. 2017, Japanese, サンポートホール高松(高松市）, Domestic conference

  Poster presentation


• 春季深江丸研究航海にて観測された瀬戸内海海上PM2.5の濃度変化について

  Katsuhiro KAWAMOTO, Ryotaro KAKIHANA, Kazuyo YAMAJI, Mitsuru HAYASHI, Ryohei NAKATUBO, Yasuyuki ITANO, katsuhiko YAMAMOTO, Tadashi WADA

  第23回大気化学討論会, Oct. 2017, Japanese, サンポートホール高松（高松市）, Domestic conference

  Poster presentation


• Effects of interactions between meteorology and ambient pollutants on simulated air quality over metropolitan regions in Japan

  Satoru CHATANI, Masayuki TAKIGAWA, Kyo KITAYAMA, Kazuyo YAMAJI

  Community Modeling and Analysis System, Oct. 2017, English, University of North Carolina at Chapel Hill, USA, International conference

  Oral presentation


• 練習船深江丸による瀬戸内海におけるPM2.5の洋上観測

  Katsuhiro KAWAMOTO, Ryotaro KAKIHANA, Kazuyo YAMAJI, Mitsuru HAYASHI, Ryohei NAKATSUBO, Yasuyuki ITANO, Katsuhiko YAMAMOTO, Tadashi WADA

  第58回大気環境学会年会, Sep. 2017, Japanese, 兵庫医療大学(神戸市）, Domestic conference

  Poster presentation


• 物質輸送シミュレーションとMAX-DOAS法による東シナ海のNO2カラム濃度長期変動解析

  Tomoki HIRAYAMA, Yugo KANAYA, Kazuyo YAMAJI

  第58回大気環境学会年会, Sep. 2017, Japanese, 兵庫医療大学(神戸市), Domestic conference

  Oral presentation


• 大気質モデル間相互比較研究J-STREAMの現状と課題

  Kazuyo YAMAJI

  第58回大気環境学会年会, Sep. 2017, Japanese, 兵庫医療大学(神戸市), Domestic conference

  Oral presentation


• 大気質モデル間相互比較研究J-STREAMの概要

  Satoshi CHATANI, Seiji SUGATA, Tatsuya NAGASHIMA, Yu YORINO, Kazuyo YAMAJI, Hiroshi HAYAMI, Shuichi ITAHASHI

  第58回大気環境学会年会, Sep. 2017, Japanese, 兵庫医療大学(神戸市), Domestic conference

  Oral presentation


• 大気モデル化学反応メカニズムの違いによるO3濃度差の評価

  Hibiki KITAYAMA, Yu MORINO, Kazuyo YAMAJI, Satoshi CHATANI

  第58回大気環境学会年会, Sep. 2017, Japanese, 兵庫医療大学(神戸市), Domestic conference

  Oral presentation


• 高解像度植生・植物起源VOC排出インベントリデータベースの構築と気象・大気質シミュレーションへの影響

  Satoshi CHATANI, Tomonori OKUMURA, Hikari SHIMADERA, Kazuyo YAMAJI, Hibiki KITAYAMA, Soh MATSUNAGA

  第58回大気環境学会年会, Sep. 2017, Japanese, 兵庫医療大学(神戸市), Domestic conference

  Oral presentation


• 2013年度関西・関東都市域におけるPM2.5とその成分に対する大気質モデルの再現性評価

  Shunsuke MATSUI, Hikari SHIMADERA, Kazuyo YAMAJI, Satoshi CHATANI, Tomohito MATSUO, Akira KONDOH

  第58回大気環境学会年会, Sep. 2017, Japanese, 兵庫医療大学(神戸市), Domestic conference

  Oral presentation


• 西部北太平洋域での大気窒素化合物沈着による海洋低次生態系への寄与評価

  Fumikazu TAKETANI, Maki AITA, Kohei IKEDA, YAMAJI KAZUYO, Kosei SASAOKA, Kazuhiko MATSUMOTO, Makio HONDA, Yugo KANAYA

  JpGU-AGU Joint Meeting 2017, May 2017, Japanese, 幕張メッセ(千葉市）, International conference

  Poster presentation


• Preliminary results of O3 comparison in J-STREAM project

  Kazuyo YAMAJI

  8th International Workshop on Atmospheric Modeling Research in East Asia, Mar. 2017, English, Laxenburg（Austria）, International conference

  Oral presentation


• モデル間相互比較J-STREAMの紹介とお誘い

  Kazuyo YAMAJI

  アジア域の化学輸送モデルの現状と今後の展開に関する研究集会, Dec. 2016, Japanese, Fukuoka/Kasuga, Domestic conference

  Oral presentation


• WRF‐CMAQによる関西都市域のPM2.5とその成分の再現性について

  Shunsuke MATSUI, Kazuyo YAMAJI, Satoru CHATANI

  大気環境学会近畿支部第５回支部研究発表会, Dec. 2016, Japanese, Osaka, Domestic conference

  Oral presentation


• 中国上空におけるオゾンの増加：モデルシミュレーションと衛星観測の比較

  Mizuo KAJINO, Sachiko HAYASHIDA, Kazuyo YAMAJI, Makoto DEUSHI, Tsuyoshi SEKIYAMA, Takashi MAKI

  第22回大気化学討論会, Oct. 2016, Japanese, Sapporo, Domestic conference

  Oral presentation


• 都市域を対象とした大気質モデルによる二次大気汚染物質の再現性の評価

  Kazuyo YAMAJI, Hirokazu UEDE, Satoru CHATANI, Hiroshi HAYAMI, Hikari SHIMADERA

  第57回大気環境学会年会, Sep. 2016, Japanese, Sapporo, Domestic conference

  Oral presentation


• Satellite measurement of the lower tropospheric ozone enhancement over East Asia – elimination of the effect from the upper troposphere and lower stratosphere

  Sachiko HAYASHIDA, Makoto DEUSHI, Kazuyo YAMAJI, Mizuo KAJINO, Tsuyoshi Thomas SEKIYAMA, Takashi MAKI, Xiong LIU

  2016 International Global Atmospheric Chemistry(IGAC) Science Conference, Sep. 2016, English, Breckenridge（USA）, International conference

  Poster presentation


• Evaluation of performance of simulated secondary pollutants by using air quality models for urban areas in Japan 2016

  Kazuyo YAMAJI, Hirokazu UEDE, Satoru CHATANI, Hiroshi HAYAMI, Hikari SHIMADERA

  2016 International Global Atmospheric Chemistry Science Conference, Sep. 2016, English, Breckenridge(USA), International conference

  Poster presentation


• 東アジアにおける下部対流圏オゾンの衛星観測とモデルシミュレーションの比較

  Sachiko HAYASHIDA, Makoto DEUSHI, Mizuo KAJINO, Kazuyo YAMAJI, Tsuyoshi SEKIYAMA, Takashi MAKI

  Japan Geoscience Union Meeting 2016, May 2016, Japanese, Chiba, International conference

  Oral presentation


• 中国中東部におけるオゾン増加:衛星観測とモデルシミュレーションの比較

  Sachiko HAYASHIDA, Makoto DEUSHI, Kazuyo YAMAJI, Mizuo KAJINO, Tsuyoshi SEKIYAMA, Takashi MAKI

  日本気象学会2016年度春季大会, May 2016, Japanese, Tokyo, Domestic conference

  Poster presentation


• 2011年夏季関東地域を対象とした大気質モデルによる二次大気汚染物質の再現性の評価

  Kazuyo YAMAJI, Hirokazu UEDE, Satoru CHATANI, Hiroshi HAYAMI, Hikari SHIMADERA

  Japan Geoscience Union Meeting 2016, May 2016, Japanese, Chiba, International conference

  Oral presentation


• 光化学オキシダント影響評価に向けた数値モデル研究

  Kazuyo YAMAJI

  大気環境学会近畿支部人体影響部会2015年度セミナー「光化学オキシダントの実態と健康影響」, Mar. 2016, Japanese, Osaka, Domestic conference

  Oral presentation


• 近年の東アジアにおける黄砂現象の年々変動とその要因に関する研究

  Hiromi UEDA, Kazuyo YAMAJI

  大気環境学会近畿支部第４回支部研究発表会, Dec. 2015, Japanese, Osaka, Domestic conference

  Oral presentation


• Ozone Enhancement in the Lower Troposphere over Central and Eastern China as Observed from the space

  Sachiko HAYASHIDA, Akiko ONO, Satoko KAYABA, Mizuo KAJINO, Makoto DEUSHI, Takashi MAKI, Tsuyoshi Thomas SEKIYAMA, Kazuyo YAMAJI, Xiong LIU

  American Geophysical Union FALL MEETING, Dec. 2015, English, San Francisco(USA), International conference

  Poster presentation


• Study on factors of overestimated summertime ozone concentration by a regional chemical transport model over Southwestern seas of Japan.

  Kazuyo YAMAJI, Yugo KANAYA, Masayuki TAKIGAWA, Golam SARWAR, Kengo SUDO

  The 13 th International Conference on Atmospheric Sciences and Applications to Air Quality, Nov. 2015, English, Kobe, International conference

  Poster presentation


• 東アジアにおける大気微量成分の衛星観測結果とモデルシミュレーションの比較

  Satoko KAYABA, Sachiko HAYASHIDA, Akiko ONO, Makoto DEUSHI, Mizuo KAJINO, Tsuyoshi SEKIYAMA, Takashi MAKI, Kazuyo YAMAJI

  日本気象学会2015年度秋季大会, Oct. 2015, Japanese, Kyoto, Domestic conference

  Poster presentation


• 東アジアにおける大気微量成分の衛星観測結果とモデルシミュレーションの比較

  Satoko KAYABA, Sachiko HAYASHIDA, Akiko ONO, Makoto DEUSHI, Mizuo KAJINO, Tsuyoshi SEKIYAMA, Takashi MAKI, Kazuyo YAMAJI

  第21回大気化学討論会, Oct. 2015, Japanese, Tokyo, Domestic conference

  Oral presentation


• Ozone Enhancement in the Lower Troposphere over Central and Eastern China Observed from OMI: Comparison with Emission Inventries, Ground-based Measurements, and Model simulations

  Sachiko HAYASHIDA, Akiko ONO, Satoko KAYABA, Mizuo KAJINO, Makoto DEUSHI, Takashi MAKI, Tsuyoshi SEKIYAMA, Kazuyo YAMAJI, Xiong. Liu, K. Chance

  The 6th GEMS Science Team Meeting, Oct. 2015, English, Busan（Korea）, International conference

  Oral presentation


• Synthesis of observations of atmospheric black carbon, organics and PM2.5 aerosols over Japan, Korea, and China with numerical simulations to better constrain their emission rates and origins

  Yugo KANAYA, Fumikazu TAKETANI, Xiaole PAN, Yuichi KOMAZAKI, Takuma MIYAKAWA, Hitoshi MATSUI, Kazuyo YAMAJI, Zifa WANG, Limseok CHANG, Daeil KANG, Akinori TAKAMI, Kohei IKEDA, Hiroshi TANIMOTO, Yutaka KONDO

  AOGS 12th Annual Meeting, Aug. 2015, English, Singapore, International conference

  Oral presentation


• 八方尾根におけるオゾンおよびCO、CO2、CH4の観測と化学輸送モデルによる起源推定

  Sachiko OKAMOTO, Hiroshi TANIMOTO, Hideki NARA, Kohei IKEDA, Kazuyo YAMAJI

  Japan Geoscience Union Meeting 2015, May 2015, Japanese, Chiba, International conference

  Oral presentation


• 排出インベントリの概要及び化学輸送モデルへの活用について

  Kazuyo YAMAJI

  講演会「全環研酸性雨データの活用例と排出インベントリを活用した大気質予測について」, Feb. 2015, Japanese, Toba・Mie, Domestic conference

  Oral presentation


• 日中韓広域大気汚染集中観測における有機エアロゾル・PM2.5濃度のモデル再現性評価：VBSアプローチによる改善

  Yugo KANAYA, Hitoshi MATSUI, Fumikazu TAKETANI, Yuichi KOMAZAKI, Xiole Pan, Kazuyo YAMAJI, Kohei IKEDA, Akinori TAKAMI, Hiroshi TANIMOTO, Yutaka KONDO, Zifa WANG, Daeil KANG, Limseok CHANG

  第20回大気化学討論会, Oct. 2014, Japanese, Fuchu(Tokyo), Domestic conference

  Poster presentation


• 日本のPM2.5質量濃度に対する発生源地域別の寄与

  Kohei IKEDA, Kazuyo YAMAJI, Yugo KANAYA, Fumikazu TAKETANI, Pan Xiaole, Yuichi KOMAZAKI, Jun-ichi KUROKAWA, Toshimasa OHARA

  2014年度日本地球化学会第61回年会, Sep. 2014, Japanese, Toyama City, Domestic conference

  Oral presentation


• 化学輸送モデルにおける日本南西海域での夏季オゾン過大評価傾向の要因について

  Kazuyo YAMAJI, Yugo KANAYA, Masayuki TAKIGAWA

  第56回大気環境学会年会, Sep. 2014, Japanese, Tokyo, Domestic conference

  Oral presentation


• Mass concentrations of organic aerosol and PM2.5 in East Asia reproduced by using volatility base-set approach in the WRF-Chem model

  Yugo KANAYA, Hitoshi MATSUI, Fumikazu TAKETANI, Xiaole PAN, Yuichi KOMAZAKI, Kazuyo YAMAJI, Zifa WANG, Kohei IKEDA, Limseok CHANG, Daeil KANG, Akinori TAKAMI, Hiroshi TANIMOTO, Yutaka KONDO

  13th Quadrennial ICACGP Symposium & 13th IGAC Science Conference on Atmospheric Chemistry, Sep. 2014, English, Natal(Brazil), International conference

  Poster presentation


• Emissions of nonmethane volatile organic compounds from open crop residue burning in the Yangtze River Delta region, China.

  Shinji KUDO, Hiroshi TANIMOTO, Satoshi INOMATA, Shinji SAITO, Xiaole PAN, Yugo KANAYA, Fumikazu TAKETANI, Zifa WANG, Hongyan CHEN, Huabin DONG, Meigen ZHANG, Kazuyo YAMAJI

  13th Quadrennial IGACGP Symposium, 13th IGAC Science Conference on Atomospheric Chemistry, Sep. 2014, English, Natal(Brazil), International conference

  Oral presentation


• Comprehensive sensitivity analyses on air quality model performance for PM2.5 simulation

  Hikari SHIMADERA, Hiroshi HAYAMI, Satoru CHATANI, Tazuko MORIKAWA, Yu MORINO, Toshimasa OHARA, Yasuaki MORI, Kazuyo YAMAJI, Seiji NAKATSUKA

  16th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, Sep. 2014, English, Verna(Bulgaria), International conference

  Poster presentation


• 2009-2013年の福江島におけるPM2.5とオゾンの変動解析

  Kazuyo YAMAJI, Kohei IKEDA, Yugo KANAYA, Fumikazu TAKETANI, Hiroshi TANIMOTO

  第55回大気環境学会年会, Sep. 2014, Japanese, Ehime・Matsuyama, Domestic conference

  Oral presentation


• An evaluation of the CMAQ reproducibility of satellite tropospheric NO2 column observations at different local times over East Asia

  Hitoshi IRIE, Kazuyo YAMAJI, Kohei IKEDA, Uno ITSUSHI, Shuichi ITAHASHI, Toshimasa OHARA, Jun-ichi KUROKAWA

  2013 AGU Fall Meeting, Dec. 2013, English, San Francisco(USA), International conference

  Poster presentation


• 大気物質輸送シミュレーションによる船舶起源排ガスの大気質影響評価

  Kazuyo YAMAJI

  日本航海学会第129回講演会, Nov. 2013, Japanese, Kobe, Domestic conference

  Oral presentation


• GOME-2, SCIAMACHY, OMI の対流圏 NO2 カラム衛星データを複合利用した CMAQ モデルの評価

  Hitoshi IRIE, Kazuyo YAMAJI, Kohei IKEDA, Itsushi UNO, Shuichi ITAHASHI, Toshimasa Ohara, Junichi KUROKAWA

  日本気象学会, Nov. 2013, Japanese, Sendai, Domestic conference

  Oral presentation


• GOME-2, SCIAMACHY, OMI の対流圏 NO2 カラム衛星データを複合利用した CMAQ モデルの評価

  Hitoshi IRIE, Kazuyo YAMAJI, Kohei IKEDA, Itsushi UNO, Shuichi ITAHASHI, Toshimasa OHARA, Junichi KUROKAWA

  大気化学討論会, Nov. 2013, Japanese, Ishikawa Prefecture, Nanao City,, Domestic conference

  Oral presentation


• Models reproducibility of ozone concentrations over Japan in warm season.

  Kazuyo YAMAJI, Masayuki TAKIGAWA, Kohei IKEDA

  12th Annual CMAS Conference, Oct. 2013, English, North Carolina(USA), International conference

  Oral presentation


• An evaluation of the CMAQ reproducibility of satellite tropospheric NO2 column observations at different local times over East Asia

  Hitoshi IRIE, Kazuyo YAMAJI, Kohei IKEDA, Itsushi UNO, Shuichi ITAHASHI, Toshimasa OHARA, Junichi KUROKAWA

  GEMS workshop, Oct. 2013, English, Seoul(KOREA), International conference

  Oral presentation


• 福江島における暖候期オゾン濃度のモデル再現性に関する研究

  Kazuyo YAMAJI, Masayuki TAKIGAWA, Kohei IKEDA, Yugo KANAYA, Xiaole PAN, Hiroshi TANIMOTO

  第54回大気環境学会年会, Sep. 2013, Japanese, Niigata, Domestic conference

  Oral presentation


• 日本のPM2.5質量濃度に対する発生源地域の感度解析

  Kohei IKEDA, Kazuyo YAMAJI, Yugo KANAYA, Fumikazu TAKETANI, Pan Xiaole, Yuichi KOMAZAKI, Jun-ichi KUROKAWA, Toshimasa Ohara

  第54回大気環境学会年会, Sep. 2013, Japanese, Niigata, Domestic conference

  Oral presentation


• 大気質モデルによるPM2.5主要成分の再現性向上のための感度解析

  Hikari SHIMADERA, Hiroshi HAYAMI, Satoru CHATANI, Tazuko MORIKAWA, Yu MORINO, Toshimasa OHARA, Yasuaki MORI, Kazuyo YAMAJI, Seiji NAKATSUKA

  第30回エアロゾル科学・技術研究討論会, Aug. 2013, Japanese, Kyoto, Domestic conference

  Oral presentation


• An evaluation of the CMAQ reproducibility of satellite tropospheric NO2 column observations at different local times over East Asia

  Hitoshi IRIE, Kazuyo YAMAJI, Kohei IKEDA, Itsushi UNO, Shuichi ITAHASHI, Toshimasa Ohara, Junichi KUROKAWA

  The 6th International DOAS workshop, Aug. 2013, English, Boulder(USA), International conference

  Oral presentation


• 長崎県福江島におけるPM2.5のモデル解析

  Kazuyo YAMAJI

  2013 年度海洋気象学会第1回例会, Jul. 2013, Japanese, Kobe, Domestic conference

  Oral presentation


• 東アジア域大気汚染物質の発生源感度評価のためのモデル間相互比較

  Kazuyo YAMAJI, Kohei IKEDA, Masayuki TAKIGAWA, Tatsuya NAGASHIMA

  日本地球惑星科学連合2013年大会, Jun. 2013, Japanese, 幕張・千葉, Domestic conference

  Poster presentation


• Regional-scale transport of PM2.5 in East Asia: Implications to air quality over Japan

  Kohei IKEDA, Kazuyo YAMAJI, Yugo KANAYA, Fumikazu TAKETANI, Xiaole PAN, Yuichi KOMAZAKI, Jun-ichi KUROKAWA, Toshimasa OHARA

  12th International Conference on Atmospheric Sciences and Applications to Air Quality, Jun. 2013, English, Seoul(KOREA), International conference

  Poster presentation


• Model inter-comparison for evaluation on source sensitivities of ozone and PM2.5 over East Asia. The 12 th International Conference on Atmospheric Sciences and Applications to Air Quality

  Kazuyo YAMAJI, Kohei IKEDA, Masayuki TAKIGAWA, Yugo KANAYA, Tatsuya NAGASHIMA

  The 12 th International Conference on Atmospheric Sciences and Applications to Air Quality, Jun. 2013, English, Seoul・Korea, International conference

  Poster presentation


• 東アジアにおける対流圏 NO2 カラム衛星データの CMAQ による再現性の評価:日変化の観点から

  Hitoshi IRIE, Kazuyo YAMAJI, Kohei IKEDA, Itsushi UNO, Shuichi ITAHASHI, Toshimasa Ohara, Junichi KUROKAWA

  日本地球惑星科学連合大会, May 2013, Japanese, Chiba City, International conference

  Oral presentation


• Model analysis of seasonal variation of PM2.5 across Japan and its regional-scale transport in East Asia

  Kohei IKEDA, Kazuyo YAMAJI, Yugo KANAYA, Fumikazu TAKETANI, Xiaole PAN, Yuichi KOMAZAKI, Jun-ichi KUROKAWA, Toshimasa OHARA

  European Geosciences Union General Assembly 2013, Apr. 2013, English, Vienna(Austria), International conference

  Poster presentation


• GOME-2, SCIAMACHY, OMIの対流圏NO_2カラム衛星データを複合利用したCMAQモデルの評価

  入江 仁士, 山地 一代, 池田 恒平, 鵜野 伊津志, 板橋 秀一, 大原 利眞, 黒川 純一

  大会講演予講集, 2013, Japanese, 日本気象学会


• 球形粒子の光学的スケールハイトを利用した化学輸送モデルとライダー観測におけるエアロゾル鉛直分布比較

  清水 厚, 山地 一代

  大会講演予講集, 2013, Japanese, 日本気象学会


• SCIAMACHY,OMI,GOME-2の対流圏NO2カラム濃度を複合利用したCMAQモデルの評価

  入江 仁士, 山地 一代, 池田 恒平, 鵜野 伊津志, 板橋 秀一, 大原 利眞, 黒川 純一

  大会講演予講集, 2012, Japanese, 日本気象学会


• Year-round model analysis of ozone, pm2.5, and their precursors observed at Fukue Island

  YAMAJI Kazuyo, IKEDA Kohei, KANAYA Yugo, KOMAZAKI Yuichi, PAN Xiaole, UNO Itsushi, KUROKAWA Junichi, OHARA Toshimasa, TANIMOTO Hiroshi, YOKOUCHI Yoko, Li Jie, IRIE Hitoshi, TAKASHIMA Hisahiro

  大気環境学会年会講演要旨集, 2012, Japanese, 大気環境学会


• Sensitivity analysis of source regions on PM2.5 concentration at Fukue Island in 2010

  IKEDA Kohei, YAMAJI Kazuyo, KANAYA Yugo, TAKETANI Fumikazu, Pan Xiaole, KOMAZAKI Yuichi, KUROKAWA Junichi, OHARA Toshimasa

  大気環境学会年会講演要旨集, 2012, Japanese, 大気環境学会


• Sensitivity analysis of air quality models to improve performance for PM2.5 nitrate simulation

  SHIMADERA Hikari, HAYAMI Hiroshi, CHATANI Satoru, MORINO Yu, MORI Yasuaki, MORIKAWA Tazuko, YAMAJI Kazuyo, OHARA Toshimasa

  大気環境学会年会講演要旨集, 2012, Japanese, 大気環境学会


• Source apportionment of carbonaceous aerosols in Beijing

  MORINO Yu, OHARA Toshimasa, HASEGAWA Shuichi, FUSHIMI Akihiro, KONDO Miyuki, TANABE Kiyoshi, YAMAJI Kazuyo, Zhao B., Xu J., Hao J.

  大気環境学会年会講演要旨集, 2012, Japanese, 大気環境学会


• Model performance for PM2.5 concentration and components at Fukue Island in autumn 2011

  IKEDA Kohei, TAKETANI Fumikazu, YAMAJI Kazuyo, KANAYA Yugo, KUROKAWA Junichi, OHARA Toshimasa

  大気環境学会年会講演要旨集, 2012, Japanese, 大気環境学会


• 黄海・東シナ海のSST解像度が春季の大気汚染物質の輸送・沈着に与える影響

  池田 恒平, 山地 一代, 滝川 雅之, 竹谷 文一, 金谷 有剛

  大会講演予講集, 2012, Japanese, 日本気象学会


• 領域気象モデルWRFにおける日本域の降水の再現性検証

  池田 恒平, 山地 一代, 滝川 雅之

  大会講演予講集, 2011, Japanese, 日本気象学会


• 大気汚染の最新の状況「広域大気における光化学オキシダント濃度の増加とアジア諸国の現状および越境大気汚染」

  Kazuyo YAMAJI

  日本機械学会講習会教材, Jun. 2010, Japanese

  [Invited]


• 領域物質輸送モデルを用いた長崎県福江島における大気汚染解析

  山地 一代, Jie Li, 鵜野 伊津志, 金谷 有剛, 竹谷 文一, 谷本 浩志, 猪俣 敏, 福江島観測チーム

  大会講演予講集, 2010, Japanese, 日本気象学会


• 領域物質輸送モデルを用いたCentral East China域における大気汚染物質の変動解析

  山地 一代, Li Jie, 鵜野 伊津志, 滝川 雅之, 金谷 有剛, 駒崎 雄一, 大原 利眞, 秋元 肇

  大会講演予講集, 2009, Japanese, 日本気象学会


• Impact of biomass burning in the North China Plain on air quality

  YAMAJI Kazuyo, UNO Itsushi, KANAYA Yugo, KOMAZAKI Yuichi, OHARA Toshimasa, AKIMOTO Hajime

  大気環境学会年会講演要旨集, 2009, Japanese, 大気環境学会


• 東アジアにおけるオゾン前駆物質排出量の経年変化と将来予測

  大原 利眞, 黒川 純一, 秋元 肇, 山地 一代, 堀井 伸浩, 早坂 忠裕

  日本農業気象学会大会講演要旨, 2008, Japanese, 日本農業気象学会


• Estimation and future projectons of impact on rice yields by surface ozone in China

  KURIBAYASHI Masatoshi, OHARA Toshimasa, YAMAJI Kazuyo

  大気環境学会年会講演要旨集, 2008, Japanese, 大気環境学会


• 東アジアにおける対流圏オゾン濃度の将来予測

  山地 一代, 大原 利眞, 鵜野 伊津志, 堀井 伸浩, 黒川 純一, 秋元 肇

  大会講演予講集, Apr. 2006, Japanese, 日本気象学会


• 都市スケール化学天気予報システムの開発(2)

  滝川 雅之, 山地 一代, 秋元 肇, 高橋 正明

  大会講演予講集, 2006, Japanese, 日本気象学会


• Study of CH4 and N2O emission from domestic livestock in Asia

  Yamaji Kazuyo, Ohara Toshimasa, Akimoto Hajime

  大気環境学会年会講演要旨集, 2002, Japanese, 大気環境学会


• Study of CH4 emission from domestic livestock in Asia

  Yamaji K., Ohara T., Yan X., Akimoto H.

  大気環境学会年会講演要旨集, 2001, Japanese, 大気環境学会


• Development of emission inventories for atmospheric trace constituents in Asia (1)

  Ohara T., Akimoto H., Yamaji K., Kurokawa J., Streets David

  大気環境学会年会講演要旨集, 2001, Japanese, 大気環境学会

• American Geophysical Union


• Japan Geoscience Union


• Japan Society of Atmospheric Chemistry


• Meteorological Society of Japan


• Japan Society for Atmospheric Environment

• 領域化学輸送モデル間の相互比較に基づく大気質改善予測の信頼性向上

  茶谷 聡, 櫻井 達也, 板橋 秀一, 嶋寺 光, 山地 一代

  日本学術振興会, 科学研究費助成事業 基盤研究(B), 基盤研究(B), 国立研究開発法人国立環境研究所, 01 Apr. 2022 - 31 Mar. 2025


• 燃焼起源SLCFの東アジア国別排出量の迅速把握と方法論構築

  独立行政法人環境再生保全機構, 環境総合推進費, 国立環境研究所, Apr. 2022 - Mar. 2025, Coinvestigator


• An Interdisciplinary Study toward Clean Air, Public Health and Sustainable Agriculture: The Case of Crop Residue Burning in North India

  Research Institute for Humanity and Nature, Research Project, Research Institute for Humanity and Nature, Oct. 2018 - Mar. 2025, Coinvestigator


• Influence of deposition of atmospheric nitrogen compounds to the marine ecosystem at the northeastern Indian Ocean

  TAKETANI Fumikazu

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Japan Agency for Marine-Earth Science and Technology, 01 Apr. 2018 - 31 Mar. 2021

  We conducted a comprehensive study for influence of atmospheric nitrogen compounds to the marine ecosystem in the northeastern Indian Ocean by ship observation, satellite analysis, and numerical model calculation. In November 2018, the dry and wet deposition flux of atmospheric nitrogen compounds to the ocean was estimated during the R/V Hakuho-Maru cruise. The dry deposition flux was high in the northern hemisphere and low in the southern hemisphere. The origin was estimated using numerical model calculations, suggesting the industrial activity. We compared the primary productivity of the ocean surface estimated from field/satellite observations with the productivity estimated from the supply amount of atmospheric nitrogen compounds and the Redfield ratio, indicating that atmospheric nitrogen compounds deposition may have a significant impact on the ocean surface productivity in the northeastern Indian Ocean.


• Constructing the Arctic International Legal Order: Science, Environment, Ocean, and Institution

  Shibata Akiho

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Kobe University, Apr. 2016 - Mar. 2021

  “Arctic International Law” has now been firmly recognized as a distinct and important research topic of international law in Japanese international law academia through the publication of two books (Japanese and English) under this project. The successful publication of a special issue of the world-renowned journal “Polar Record” on Arctic resource development with 10 articles providing the state-of-the-art analysis of the topic has demonstrated the high quality of the academic achievement. The special issue was co-edited by the principal investigator of this project with an early-career scholar from Belgium. This project convened annually international symposia with Arctic legal and policy stakeholders providing opportunities for in-depth dialogue, some of those results being published as easy-to-read Briefing Paper Series.

  Competitive research funding


• Evaluation of air pollution over Asis and effects of trannsboundary pollution: Comparison of satellite measurements and ACTM simulations

  Hayashida Sachiko

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Nara Women's University, 01 Apr. 2016 - 31 Mar. 2019

  We analyzed the ozone profile product (PROFOZ) derived from Ozone Monitoring Instrument (OMI) ultraviolet spectra to reveal spatial and temporal variations in lower tropospheric ozone distributions over China (Hayashida et al., 2015). In this JSPS study, we developed a scheme to eliminate the artificial effect of ozone variability near the tropopause on the lower tropospheric ozone retrieval (Hayashida et al., 2018a). After applying the developed screening scheme, we tracked the ozone enhancement under polluted conditions by using a cluster analysis. We distinguished the areas in which outstanding ozone enhancement with clear seasonality over the North China Plain and Sichuan basin (Hayashida et al., 2018b). Comparison with simulations by the regional atmospheric chemical transport model developed in Meteorological Research Institute (MRI) proved the possibility of ozone-change detection expected from reduction of ozone precursors according to environmental policies.


• Enhancement of secondary organic aerosols simulation to improve prediction of atmospheric PM2.5 concentration

  Kazuyo Yamaji

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), Kobe University, Apr. 2014 - Mar. 2017, Principal investigator

  Reproducibility of PM2.5 concentration due to implementations of updated anthropogenic and biogenic emissions and a new aerosol mechanism including the volatility basis set were evaluated for improving the prediction of atmospheric PM2.5 concentration. Concentration levels of organic aerosol have been improved and that slightly affected on PM2.5 concentration levels. However, reproducibility of the other species (ex. sulfate) was not necessarily improved.

  Competitive research funding


• 大気中の二次汚染物質に対する発生源寄与推計と対策立案に資する規範的モデルの確立-モデル間相互比較に基づく発生源寄与割合の総合的・統合的評価手法の開発に関する研究-

  山地 一代

  国立研究開発法人国立環境研究所, 平成29年度環境省環境研究総合推進費, 2017, Principal investigator

  Competitive research funding


• 北極気候に関わる大気物質

  山地 一代

  北極域研究推進プロジェクト（ArCSプロジェクト）, 2016, Principal investigator

  Competitive research funding


• Introduction of data assimilation method for chemicaltransport modeling over East Asia and its new development

  UNO Itsushi, TAKEMURA Toshihiko, HIROSE Naoki, YAMAJI Kazuyo, YUMIMOTO Keiya, OHARA Toshimasa

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Grant-in-Aid for Scientific Research (A), Kyushu University, 2009 - 2012

  Chemical transport models (CTMs) of CMAQ and GEOS-CHEM wre used to study the source-receptor analysis based on Higher Direct-Decouple Method-3D (HDDM) and modeled green function optimization method to optimize the emission strength and initial condition of CTM. Source-receptor analysis and emissioninversion based on satellite trace gas observation and HDDM was used to study the impact of Chinese air pollutant emission to downwind countries. MOPITTO CO observation and green function optimization was used to estimate the year-by-year variation ofChinese CO emission intensity.


• Understanding uncertainties of anthropogenic emission estimation over East Asia

  YAMAJI Kazuyo

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Grant-in-Aid for Young Scientists (B), Japan Agency for Marine-Earth Science and Technology, 2007 - 2009

  中国における野焼き起源の排出量に着目し、daily agricultural burning emission inventoryを作成した。このemission inventoryを物質化学輸送モデルに取り込み、東アジア域の大気物質濃度のモデルによる再現性の向上に成功した。さらに、野焼きによる大気物質濃度への影響を定量的に評価した。その結果、中国の野焼きの影響は、6月前半に集中する事が判明した。さらに、人為起源のBCとCOの排出量が、2倍程度過小であることを指摘した。