Research activity information

• Paleovegetation changes from 9,500 to 3,200 years ago based on pollen analysis in Lake Harutori, eastern Hokkaido, Japan

  酒井恵祐, 中西利典, 七山太, 藤木利之, 大串健一

  Last, Mar. 2024, 汽水域研究, 31, 1 - 13, Japanese

  [Refereed]

  Scientific journal


• 有孔虫分析からみた北西太平洋の海洋貧酸素化–最終氷期から完新世にかけて–

  酒井恵祐, 大串健一

  Feb. 2022, 号外地球, 71, 112 - 117, Japanese

  In book


• Salinity, oxygen isotope, hydrogen isotope, and radiocarbon of coastal seawater of North Japan

  Kaoru Kubota, Keisuke Sakai, Ken’ichi Ohkushi, Tomihiko Higuchi, Kotaro Shirai, Masayo Minami

  2022, GEOCHEMICAL JOURNAL, 56(6) (6), 240 - 249, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Environmental change before and after the Kikai-Akahoya Tephra : Examination of the MIK Core analysis, Miyazaki Plain, southeastern Kyushu

  桒畑光博, 杉山真二, 中西利典, 足立達朗, 田尻義了, 下山正一, 山口龍彦, 大串健一, 七山 太

  May 2021, Chikyu monthly/special, (70) (70), 89 - 99

  In book


• Biotic response of benthic foraminifera to OMZ variations in the northwestern Pacific since the last deglaciation

  Keisuke Sakai, Ken’ichi Ohkushi, Akihiko Shibahara

  Mar. 2021, Geo-Marine Letters, 41(1) (1), English

  [Refereed]

  Scientific journal


• つるかぶと科学教室の実施報告

  新井敏夫, 大串健一

  Last, Sep. 2020, 神戸大学大学院人間発達環境学研究科研究紀要, 14(1) (1), 135 - 138

  Research institution

  Link to Kobe Univ. Repository (Kernel)


• RADIOCARBON AGE OFFSETS OF PLANTS AND BIOCLASTS IN THE HOLOCENE SEDIMENTS FROM THE MIYAZAKI PLAIN, SOUTHEAST COAST OF KYUSHU, SOUTHWEST JAPAN

  Toshimichi Nakanishi, Wan Hong, Mitsuhiro Kuwahata, Shinji Sugiyama, Shoichi Shimoyama, Ken’ichi Ohkushi, Tatsuhiko Yamaguchi, Jung-Hun Park, Gyujun Park, Futoshi Nanayama

  To investigate the relationship between paleoenvironmental changes and marine reservoir effects, the radiocarbon ages of marine bioclasts and terrestrial plants from the same horizons of a sediment core in the Holocene Epoch were measured. This core, with a length of approximately 9 m, was obtained from the southern part of the Miyazaki Plain southeast of Kyushu Island, which faces the Kuroshio warm current. This drilling site is located in an uplift area associated with the subduction of the Philippine Sea Plate. Based on analyses of lithology, molluscan and foraminifera assemblages, and radiocarbon dating, we interpreted four sedimentary units in order of age: tidal flat, inner bay, Kikai-Akahoya volcanic ash, and delta plain. These paleoenvironmental changes were mainly associated with the sea-level rise during the deglacial period. The reservoir ages of nine pairs from the tidal flat to inner bay facies were found to be from the time span of 7300–8200 cal BP. The chronological changes in the reservoir effect are correlated with those seen in Holocene sediments of the other coastal area in East Asia.

  Cambridge University Press (CUP), Dec. 2019, Radiocarbon, 61(6) (6), 1939 - 1950, English

  [Refereed]

  Scientific journal


• 古環境の色々

  大串健一

  Lead, Nov. 2019, 武庫川女子大学生活美学研究所紀要, (29) (29), 9 - 17

  [Invited]


• Response of deep-sea benthic foraminifera to paleoproductivity changes on the Shatsky Rise in the northwestern Pacific Ocean over the last 187 kyr

  OHKUSHI Ken'ichi, HATA Motoko, NEMOTO Naoki

  Oct. 2018, Paleontological Research, 22(4) (4), 326 - 351, English

  [Refereed]

  Scientific journal


• 2016年千種川一斉水温調査の水質分析結果 : 溶存イオン成分の特徴

  山本 雄大, 陀安 一郎, 藪崎 志穂, 申 基澈, 中野 孝教, 横山 正, 三橋 弘宗, 大串 健一, 伊藤 真之

  Kobe Univ., Sep. 2018, 神戸大学大学院人間発達環境学研究科紀要, 12(1) (1), 67 - 74, Japanese

  Research institution

  Link to Kobe Univ. Repository (Kernel)


• Radiocarbon age differences between benthic–planktonic foraminifera in sediment cores from the Shatsky Rise, central North Pacific

  OHKUSHI KEN-ICHI, Masao Uchida, Yasuyuki Shibata

  Benthic-planktonic foraminiferal radiocarbon age differences in deep-sea sediments are a useful paleo-proxy to estimate deep-water ventilation age from the last glacial maximum to the Holocene. However, it is very difficult to collect reasonable sediment cores for ventilation age reconstruction in the carbonate-corrosive Pacific Ocean. The Shatsky Rise, which is located in the central part of the North Pacific, is a peculiar spot in that carbonate sediments can be collected from abyssal depths. We analyzed benthic-planktonic foraminiferal radiocarbon age differences in two gravity core samples (Core NGC102 and Core NGC108) collected from the Shatsky Rise. The two cores consisted mostly of bioturbated calcareous ooze. Sedimentation rates were 1.4-5.3cm/ka in Core NGC102 (2,612m water depth) and 2.3-6.6cm/ka in Core NGC108 (3,390m water depth). Benthic-planktonic foraminiferal age differences showed large variances, from 7,010±90 to 180±130 years in Core NGC102 and from 2,730±80 to 580±110 years in Core NGC108. In Core NGC102, the age differences (6,440 years on average) in the mixed layer were approximately 4,700 years older than the modern North Pacific deep-water age, reflecting the upward mixing of old benthic foraminifera and low sedimentation rates. On the other hand, the age difference (2,470 years) at 14-16cm depth may be approximately similar to the past deep-water age at that time. The age differences (180±130 to 280±140 years) at 22-28cm depths (16-17 ka, corresponding to Heinrich stadial event 1) were remarkably smaller than the modern deep-water age. In Core NGC108, the benthic-planktonic age difference (990±200 years) at 15,700 cal BP was estimated to be 760 years younger than the modern deep-water age. This small age difference suggests an active ventilation event of Pacific deep waters during Heinrich stadial event 1; however, causes such as atmospheric ¹⁴C decrease and/or sediment mixing (e.g., bioturbation) cannot be excluded.

  日本堆積学会, Dec. 2017, Journal of the Sedimentological Society of Japan, 76(1) (1), 17 - 27, English

  [Refereed]

  Scientific journal


• Characteristics of stable isotopes in stream water at the Chikusa River, Hyogo Prefecture, in 2015

  Yudai YAMAMOTO, Ichiro TAYASU, Takanori NAKANO, Shiho YABUSAKI, Tadashi YOKOYAMA, Hiromune MITSUHASHI, Ken’ichi OHKUSHI, ITOH MASAYUKI, Kuniyoshi EBINA

  兵庫県西部を流れる千種川は清流として知られる一方, しばしば大雨による河川氾濫が発生している. 2016年まで, 災害防止の目的で河川整備工事が行われたが, 工事による河川環境の変化や河川生態系への影響が懸念されている. 本研究では千種川の水循環や人為改変の環境影響評価の研究に必要な基礎データを得ることを目的として, 2015年8月9日に採取された河川水試料83点について, 水の水素・酸素同位体比を分析した．分析の結果は地理情報システム（GIS）により流域地図にマッピングした. 結果として, 千種川流域では, 水素・酸素同位体比ともに上流部で低い値を示し, 主要支流の佐用川や, 千種川下流に流入する支流では高い値を示した. また, 上流～中流では高度効果の影響を受けた降水の寄与がみられており, 千種川流域全体で蒸発の影響が大きいことが推測される.

  神戸大学大学院人間発達環境学研究科, Sep. 2017, 神戸大学大学院人間発達環境学研究科紀要, 11(1) (1), 105 - 109, Japanese

  [Refereed]

  Research institution

  Link to Kobe Univ. Repository (Kernel)


• Preliminary report of collaborative research project for water environment in the Chikusa river

  OHKUSHI KEN-ICHI, Takanori NAKANO, Ichiro TAYASU, Tadashi YOKOYAMA, Hiromune MITSUHASHI, Yudai YAMAMOTO, Masayuki ITOH, Kuniyoshi EBINA

  Graduate School of Human Development and Environment, Kobe University, Mar. 2017, Bulletin of Graduate School of Human Development and Environment, Kobe University, 10(2) (2), 165 - 173, Japanese

  Research institution

  Link to Kobe Univ. Repository (Kernel)


• Lithostratigraphy and paleoceanography in the Chukchi Rise of the western Arctic Ocean since the last glacial period

  Kwangkyu Park, Ken'ichi Ohkushi, Hyen Goo Cho, Boo-Keun Khim

  Mar. 2017, POLAR SCIENCE, 11, 42 - 53, English

  [Refereed]

  Scientific journal


• Quantitative reconstruction of temperature at a Jomon site in the Incipient Jomon Period in northern Japan and its implications for the production of early pottery and stone arrowheads

  Hodaka Kawahata, Yui Ishizaki, Azumi Kuroyanagi, Atsushi Suzuki, Ken-ichi Ohkushi

  Feb. 2017, QUATERNARY SCIENCE REVIEWS, 157, 66 - 79, English

  [Refereed]

  Scientific journal


• Intensification of North Pacific intermediate water ventilation during the Younger Dryas

  OHKUSHI KEN-ICHI, Naoki Hara, Minoru Ikehara, Masao Uchida, Naokazu Ahagon

  Apr. 2016, Geo-Marine Letters, 1 - 8, English

  [Refereed]

  Scientific journal


• Centennial- to millennial-scale change of Holocene shallow marine environments recorded in ostracode fauna, northeast Japan

  Toshiaki Irizuki, Miki Kobe, Ken'ichi Ohkushi, Hodaka Kawahata, Katsunori Kimoto

  Nov. 2015, QUATERNARY RESEARCH, 84(3) (3), 467 - 480, English

  Scientific journal


• 東北地方太平洋沖地震津波により岩手県久慈市に形成された津波堆積物

  Nanami Seo, OHKUSHI KEN-ICHI

  神戸大学大学院人間発達環境学研究科, Sep. 2014, 神戸大学大学院人間発達環境学研究科研究紀要, 8(1) (1), 97 - 102, Japanese

  [Refereed]

  Research institution

  Link to Kobe Univ. Repository (Kernel)


• Vertical oxygen minimum zone oscillations since 20 ka in Santa Barbara Basin: A benthic foraminiferal community perspective

  Sarah E. Moffitt, Tessa M. Hill, Kenichi Ohkushi, James P. Kennett, Richard J. Behl

  Jan. 2014, PALEOCEANOGRAPHY, 29(1) (1), 44 - 57, English

  [Refereed]

  Scientific journal


• A new local marine reservoir correction for the last deglacial period in the Sanriku region, northwestern North Pacific, based on radiocarbon dates from the Towada-Hachinohe (To-H) tephra

  Ken Ikehara, OHKUSHI KEN-ICHI, Atsushi Noda, Toru Danhara, Toru Yamashita

  Tephra is a geologically synchronous key bed that can be used to connect depositional environments ranging from terrestrial, through coastal, shallow, and deep marine, to trench. Therefore, tephra represents a uniquely important link between the geological records of terrestrial and marine settings. An understanding of the local marine reservoir effect (ΔR) is important when calibrating radiocarbon dates obtained from marine materials with calendar dates, and when correlating geological and paleoenviron-mental events across different locations. Comparison of radiocarbon dates obtained from a tephra layer deposited on marine (planktonic foraminifera) and terrestrial (buried tree trunks) materials indicates that a local marine reservoir correction of around 830 y must be applied to dates obtained for the last deglacial period from the offshore area near Sanriku, in the western NW Pacific.

  日本第四紀学会, Aug. 2013, The Quaternary Research, 52(4) (4), 127 - 137, English

  [Refereed]

  Scientific journal


• Rapid pulses of uplift, subsidence, and subduction erosion offshore Central America: Implications for building the rock record of convergent margins

  Paola Vannucchi, Peter B. Sak, Jason, P. Morgan, OHKUSHI KEN-ICHI, Kohtaro Ujiie, the IODP Expeditio, Shipboard Scientists

  Jul. 2013, Geology, 41(9) (9), 995 - 998, English

  [Refereed]

  Scientific journal


• IODP expedition 334: An investigation of the sedimentary record, fluid flow and state of stress on top of the seismogenic zone of an erosive subduction margin

  Paola Vannucchi, Kohtaro Ujiie, Nicole Stroncik, Alberto Malinverno, Ivonne Arroyo, Udo Barckhausen, Marianne J. Conin, Susan Murr Foley, Michael J. Formolo, Robert N. Harris, Arnauld Heuret, Gary J Huftile, Jun Kameda, Gil Young Kim, Steffen O. Kutterolf, Amanda J. Martino, Gillian A. McCay, Marianne Nuzzo, Ken'ichi Ohkushi, Saneatsu Saito, Peter B. Sak, Evan A. Solomon, Michael Stipp, Marta E. Torres, Akito Tsutsumi, Masaoki Uno, Yoichi Usui, Yatheesh Vadakkeyakath, Yuzuru Yamamoto, Xixi Zhao, Junjiang Zhu, Jenifer Saltman

  2013, Scientific Drilling, 15(15) (15), 23 - 30, English

  [Refereed]

  Scientific journal


• Quantified intermediate water oxygenation history of the NE Pacific: A new benthic foraminiferal record from Santa Barbara basin

  K. Ohkushi, J. P. Kennett, C. M. Zeleski, S. E. Moffitt, T. M. Hill, C. Robert, L. Beaufort, R. J. Behl

  AGU, 2013, Paleoceanography, 28(3) (3), 453 - 467, English

  [Refereed]

  Scientific journal


• Changes in chemical compositions of sea-salt particles collected at Mt. Rokko, Kobe, Japan

  Shohei Mukai, OHKUSHI KEN-ICHI

  Meteorological Research Institute, Jan. 2013, TECHNICAL REPORTS OF THE METEOROLOGICAL RESEARCH INSTITUTE, 68, 53-54, English

  Symposium


• Individual particle analysis of aerosol particles in eastern Kobe city by SEM-EDS

  向井 将平, 大串 健一

  神戸大学大学院人間発達環境学研究科, Sep. 2012, 神戸大学大学院人間発達環境学研究科研究紀要, 6・1/47ー52(1) (1), 47 - 52, Japanese

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Abrupt changes of intermediate water properties on the northeastern slope of the Bering Sea during the last glacial and deglacial period

  Stephan F. Rella, Ryuji Tada, Kana Nagashima, Minoru Ikehara, Takuya Itaki, Ken'ichi Ohkushi, Tatsuhiko Sakamoto, Naomi Harada, Masao Uchida

  Jul. 2012, PALEOCEANOGRAPHY, 27, English

  [Refereed]

  Scientific journal


• 岩手県普代川河口域に遡上した津波堆積物の予察的調査報告

  Nanami Seo, Kenichi Ohkushi

  Mar. 2012, 神戸大学大学院人間発達環境学研究科研究紀要, 5(2), Japanese

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Paleoceanographic control on a large marine reservoir effect offshore of Tokai, south of Japan, NW Pacific, during the last glacial maximum-deglaciation

  Ken Ikehara, Tohru Danhara, Tohru Yamashita, Manabu Tanahashi, Sumito Morita, Ken'ichi Ohkushi

  Dec. 2011, QUATERNARY INTERNATIONAL, 246, 213 - 221, English

  [Refereed]

  Scientific journal


• Costa Rica Seismogenesis Project (CRISP), Sampling and quantifying input to the seismogenic zone and fluid output

  Vannucchi, P, 番目にOhkushi, K, 大串 健一

  2011, Integrated Ocean Drilling Program (IODP) Expedition 334 Preliminary Report, 334, doi:10.2204/iodp.pr.334.2, English

  Scientific journal


• 5.1. Sediment core sampling

  大串 健一, Konno, S

  2010, R/V Mirai Cruise Report, MR09-03, Arctic Ocean, Bering Sea, and North Pacific Ocean,28th August to 25th October, 2009, Japan Agency for Marine-Earth Science and Technology, 118-153, English

  Scientific journal


• Changes of environments and human activity at the Sannai-Maruyama ruins in Japan during the mid-Holocene Hypsithermal climatic interval

  Hodaka Kawahata, Hisashi Yamamoto, Ken'ichi Ohkushi, Yusuke Yokoyama, Katsunori Kimoto, Hideki Ohshima, Hiroyuki Matsuzaki

  May 2009, QUATERNARY SCIENCE REVIEWS, 28(9-10) (9-10), 964 - 974, English

  [Refereed]

  Scientific journal


• Abrupt changes of intermediate-water oxygen in the northwestern Pacific during the last 27 kyr

  Yui Ishizaki, Ken'ichi Ohkushi, Takashi Ito, Hodaka Kawahata

  Apr. 2009, GEO-MARINE LETTERS, 29(2) (2), 125 - 131, English

  [Refereed]

  Scientific journal


• High-resolution paleoproductivity change in the central region of the Bering Sea since the last glaciation

  Khim, S, Kim, B.-K, Shin, H, Uchida, M, Itaki, T, 大串 健一

  2009, The Sea, Journal of the Korean Society of Oceanography, vol. 14, no. 3, 134-144

  [Refereed]

  Scientific journal


• 底生有孔虫骨格の微量元素による最終氷期以降の北西太平洋の変遷-下北半島沖MR01-K03 PC4コアの例-

  木元 克典, 阿波根 直一, 大串 健一, 内田 昌男

  海洋出版, 2008, 月刊地球, 345, 182-188(4) (4), 182 - 188, Japanese

  Scientific journal


• 最終退氷期の北太平洋における貧酸素イベント ー底生有孔虫群集の解析ー

  大串 健一, 芝原 暁彦

  2008, 月刊地球, 344, 119-125, Japanese

  Scientific journal


• 最終退氷期における北西太平洋中深層水循環変動と大気CO2変動

  内田 昌男, 阿波根 直一, 大串 健一

  海洋出版, 2008, 月刊地球, 345, 159-170(4) (4), 159 - 170, Japanese

  Scientific journal


• Late Quaternary changes in intermediate water oxygenation and oxygen minimum zone, northern Japan: A benthic foraminiferal perspective

  Akihiko Shibahara, Ken'ichi Ohkushi, James P. Kennett, Ken Ikehara

  Aug. 2007, PALEOCEANOGRAPHY, 22(3) (3), English

  [Refereed]

  Scientific journal


• Radiocarbon marine reservoir in the subarctic region off north Japan during the last deglacial period

  Ohkushi, K, Uchida, M, Aoki, K, Yoneda, M, Ikehara, K, Minoshima, K, Kawahata. H, Tada, R, Murayama, M, Shibata, Y

  2007, Radiocarbon, 49, 963 - 968


• Radiocarbon marine reservoir ages in the northwestern Pacific off Hokkaido Island, Japan, during the last deglacial period

  Ken'ichi Ohkushi, Masao Uchida, Kaori Aoki, Minoru Yoneda, Ken Ikehara, Kayo Minoshima, Hodaka Kawahata, Ryuji Tada, Masafumi Murayama, Yasuyuki Shibata

  2007, RADIOCARBON, 49(2) (2), 963 - 968, English

  Scientific journal


• Radiocarbon marine reservoir ages in the northwestern Pacific off Hokkaido Island, Japan, during the last deglacial period

  Ken'ichi Ohkushi, Masao Uchida, Kaori Aoki, Minoru Yoneda, Ken Ikehara, Kayo Minoshima, Hodaka Kawahata, Ryuji Tada, Masafumi Murayama, Yasuyuki Shibata

  2007, RADIOCARBON, 49(2) (2), 963 - 968, English

  [Refereed]

  Scientific journal


• Radiocarbon-based carbon source quantification of anomalous isotopic foraminifera in glacial sediments in the western North Pacific

  Masao Uchida, Kenichi Ohkushi, Katsunori Kimoto, Fumio Inagaki, Toyoho Ishimura, Urumu Tsunogai, Takumi TuZino, Yasuyuki Shibata

  2007, Geochemistry, Geophysics, Geosystems(G-cubed), in press, English

  [Refereed]

  Scientific journal


• Foraminiferal oxygen and carbon isotopes during the last 34 kyr off northern Japan, northwestern Pacific

  Mayumi Hoshiba, Naokazu Ahagon, Ken'ichi Ohkushi, Masao Uchida, Isao Motoyama, Akira Nishimura

  Dec. 2006, MARINE MICROPALEONTOLOGY, 61(4) (4), 196 - 208, English

  [Refereed]

  Scientific journal


• Change of bottom water conditions at intermediate depths of the Oyashio region, NW Pacific over the past 20,000 yrs

  Ken Ikehara, Ken'ichi Ohkushi, Akihiko Shibahara, Mayumi Hoshiba

  Aug. 2006, GLOBAL AND PLANETARY CHANGE, 53(1-2) (1-2), 78 - 91, English

  Scientific journal


• Reconstruction of paleoenvironmental changes based on the planktonic foraminiferal assemblages off Shimokita (Japan) in the northwestern North Pacific

  Kuroyanagi Azumi, Kawahata Hodaka, Narita Hisashi, Ohkushi Ken'ichi, Aramaki Takafumi

  Aug. 2006, GLOBAL AND PLANETARY CHANGE, 53(1-2) (1-2), 92 - 107

  [Refereed]


• Nigorikawa Tephra Recognized in the Sediment Core MD01-2409 Collected off the Shimokita Peninsula

  AOKI K., OHKUSHI K.

  Japan Association for Quaternary Research, Jun. 2006, The Quat. Res., 45(3) (3), 257 - 260, Japanese


• 西太平洋におけるIMAGESコアを用いた高時間解像度の環境復元 浮遊性有孔虫群集と表層水塊の関係に基づく過去2万7千年間の下北沖の古環境変動復元

  黒柳あずみ, 川幡穂高, 大串健一

  Planktonic foraminiferal assemblage provides the information about water mass properties. We investigate the fossil foraminiferal fauna using factor analysis to reconstruct the changes in water masses and the outflow/inflow timing of the Oyashio and Tsugaru currents across the Tsugaru Strait off Shimokita (41°33.9'N, 141°52.1'E) in the northwestern North Pacific over the last 26,900 years. In the study area, the Oyashio Current affected both surface and subsurface (below the pycnocline) waters during 26.9-15.7 thousand calendar years before present (cal. kyr BP). Vertical mixing and subsurface warming resulted from the flow of the Oyashio Current into the Japan Sea around 15.7-10.6 cal. kyr BP. The Tsugaru Current started to enter into the Pacific about 11.2-10.6 cal. kyr BP and formed two water masses condition of the surface layer under the influence of the Tsugaru and the subsurface layers of the Oyashio Current during 10.6-9.0 cal. kyr BP. The increasing of inflow of the Tsushima/Tsugaru Current enforced surface layer warming and the stratification of water column. Finally, the subsurface layer started to warm at 6.2 cal. kyr BP. The timings of outflow/inflow of the Oyashio and Tsugaru currents in this study are compatible with the results at the Japan Sea sites.

  Palaeontological Society of Japan, Mar. 2006, 化石, 79(79) (79), 33 - 42, Japanese


• Reconstruction of paleoceanographic changes based on the relationship between planktonic foraminiferal assemblages and water masses off Shimokita over the last 27,000 years

  Kuroyanagi A, Kawahata H, Ohkushi K

  Mar. 2006, Fossils, (79) (79), 33 - 42

  [Refereed]


• Deglacial dysoxic events on 100 to 200 years cycle revealed by high resolution analysis of benthic foraminiferal assemblages in core MD01-2409 collected from off Shimokita Peninsula

  Shibahara Akihiko, Arayama Eri, Ohkushi Kenichi, Aoki Kaori, Ito Takashi

  Benthic foraminiferal (BF) assemblages in core MD01-2409 collected from a water depth of 975m off Shimokita Peninsula were investigated to reconstruct bottom water oxygenation changes around north Japan during the last deglaciation. Abundance changes in dominant taxa indicate centennial changes in dissolved oxygen condition on the seafloor. The BF assemblages were classified into three groups : oxic, suboxic, and dysoxic taxa. The deglacial BF assemblages show dysoxic events on 100-200 year cycle.

  The Geological Society of Japan, Feb. 2006, Journal of the Geological Society of Japan, 112(2) (2), 166 - 169, Japanese


• O-141 Changes in OMZ in the North Pacific during the last Glacial based on foraminifera

  Ohkushi Kenichi, Shibahara Akihiko, Kennett James P., Hill Tessa, Ikehara Ken

  The Geological Society of Japan, 2006, Annual Meeting of the Geological Society of Japan, 2006, 113 - 113, Japanese


• P-46 Deglacial mid-depth circulation changes inferred from foraminiferal radiocarbon ages in sediment cores PC4/PC5 collected off Shimokita Peninsula in northern Japan

  Ahagon N., Ohkushi K., Hoshiba M., Uchida M., Shibata Y.

  The Geological Society of Japan, 2006, Annual Meeting of the Geological Society of Japan, 2006, 191 - 191, Japanese


• Age discrepancy between molecular biomarkers and calcareous foraminifera isolated from the same horizons of Northwest Pacific sediments

  M Uchida, Y Shibata, K Ohkushi, M Yoneda, K Kawamura, M Morita

  May 2005, CHEMICAL GEOLOGY, 218(1-2) (1-2), 73 - 89, English

  [Refereed]

  Scientific journal


• Foraminiferal isotope anomalies from northwestern Pacific marginal sediments

  Ken'Ichi Ohkushi, Naokazu Ahagon, Masao Uchida, Yasuyuki Shibata

  Apr. 2005, Geochemistry, Geophysics, Geosystems, 6(4) (4), English

  [Refereed]

  Scientific journal


• Foraminiferal isotope anomalies in a sediment core collected from off Tokachi

  Ohkushi Ken'ichi, Uchida Masao, Ahagon Naokazu, Shibata Yasuyuki

  本研究では，ガスハイドレート層の存在が推定されている十勝沖において採取した海底コアの有孔虫殻酸素・炭素同位体比分析を行い，メタン放出の有無を明らかにすることを目的とした．分析したコアの有孔虫の炭素同位体比は，最終氷期の層準で浮遊性・底生ともに通常の保存状態では考えられない-10‰？-2‰の大きな負のスパイクを数層準で記録した．酸素同位体比についても，最終氷期の多くの層準で0.5‰程度の正のスパイクを記録した．

  GEOCHEMICAL SOCIETY OF JAPAN, 2005, Abstracts of Annual Meeting of the Geochemical Society of Japan, 52, 252 - 252


• Landslides during early April 2005, in Tsugaru district, Aomori Prefecture(Photo)

  NEMOTO Naoki, SHIBA Masatoshi, SASAKI Minoru, OKAWARA Niina, UCHIDA Tomoko, OHGUSHI Ken'ichi, UCHIDA Rio, ANADA Tomonori

  The Association for the Geological Collaboration in Japan, 2005, Earth Science (Chikyu Kagaku), 59(5) (5), 285 - 286, Japanese


• Deep-sea benthic foraminifera : A window into ocean history

  Ohkushi Kenichi, Shibahara Akihiko

  Palaeontological Society of Japan, 2005, Fossils, 78, 69 - 75, Japanese


• Apportioning carbon sources of authigenic carbonate of ^<13>C-depleted foraminifera from off-Tokachi sediments using dual isotopic mass balance approach

  Uchida Masao, Ohkushi Ken'ichi, Ahagon Naokazu, Kimoto Katsunori, Inagaki Fumio, Shibata Yasuyuki

  The Geological Society of Japan, 2005, Annual Meeting of the Geological Society of Japan, 2005, 231 - 231, English


• Dysoxic events on 100 to 200 years cycle during the last deglaciation revealed by high resolution analysis of benthic foraminiferal assemblages in core MD10-2409 collected from off Shimokita Peninsula

  Shibahara Akihiko, Arayama Eri, Ohkushi Kenichi, Ito Takashi

  The Geological Society of Japan, 2005, Annual Meeting of the Geological Society of Japan, 2005, 143 - 143, Japanese


• Benthic foraminiferal assemblages in the Santa Barbara Basin during the last 30,000 years

  Ohkushi Kenichi

  The Geological Society of Japan, 2005, Annual Meeting of the Geological Society of Japan, 2005, 144 - 144, Japanese


• Episodic methane release events from Last Glacial marginal sediments in the western North Pacific

  Masao Uchida, Yasuyuki Shibata, Ken'Ichi Ohkushi, Naokazu Ahagon, Mayumi Hoshiba

  Aug. 2004, Geochemistry, Geophysics, Geosystems, 5(8) (8), English

  [Refereed]

  Scientific journal


• Glacial intermediate water ventilation in the Northwestern Pacific based on AMS radiocarbon dating

  Ken'ichi Ohkushi, Masao Uchida, Naokazu Ahagon, Toshiaki Mishima, Toshiya Kanematsu

  Aug. 2004, Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 223-224, 460 - 465, English

  [Refereed]

  International conference proceedings


• P-74 Episodic methane release event from the western North Pacific margin during the Last Glacial period

  Uchida Masao, Shibata Yasuyuki, Ohkushi Ken'ichi, Ahagon Naokazu, Hoshiba Mayumi

  The Geological Society of Japan, 2004, Annual Meeting of the Geological Society of Japan, 2004, 196 - 196, English


• Mid-depth circulation in the northwest Pacific during the last deglaciation: Evidence from foraminiferal radiocarbon ages

  Naokazu Ahagon, Ken'ichi Ohkushi, Masao Uchida, Toshiaki Mishima

  American Geophysical Union, Nov. 2003, Geophysical Research Letters, 30(21) (21), English

  [Refereed]

  Scientific journal


• Last Glacial-Holocene change in intermediate-water ventilation in the Northwestern Pacific

  Ken'ichi Ohkushi, Takuya Itaki, Naoki Nemoto

  Jun. 2003, Quaternary Science Reviews, 22(14) (14), 1477 - 1484

  Scientific journal


• Benthic foraminiferal and paleoceanographic fluctuations on the Shatsky Rise during the last 183kyr

  Hata Motoko, Nemoto Naoki, Ohkushi Kenichi

  The Geological Society of Japan, 2003, Annual Meeting of the Geological Society of Japan, 2003, 215 - 215, Japanese


• Glacial-interglacial deep-water changes in the NW Pacific inferred from single foraminiferal δ18O and δ13C

  Ken'ichi Ohkushi, Atsushi Suzuki, Hodaka Kawahata, Lallan P. Gupta

  Elsevier B.V., 2003, Marine Micropaleontology, 48(3-4) (3-4), 281 - 290, English

  [Refereed]

  Scientific journal


• Report from Field Trip of the 2000 Fall Meeting of the Sedimentological Society of Japan

  Ohkushi Ken'ichi

  The Sedimentological Society of Japan, 2001, Journal of the Sedimentological Society of Japan, 53(53) (53), 163 - 166


• Compound-specific radiocarbon ages of fatty acids in marine sediments from the western North Pacific

  Uchida M, Shibata Y, Kawamura K, Kumamoto Y, Yoneda M, Ohkushi K, Harada N, Hirota M, Mukai H, Tanaka A, Kusakabe M, Morita M

  2001, Radiocarbon, 43(2B) (2B), 949 - 956

  [Refereed]


• P-27 Last glacial northwestern Pacific paleoenvironments estimated from individual benthic foraminiferal δ^<18>O and δ^<13>C

  Ohkushi K., Suzuki A., Kawahata H., Gupta Lallan P.

  The Geological Society of Japan, 2000, Annual Meeting of the Geological Society of Japan, 2000, 221 - 221, Japanese


• Comparative Late Pleistocene paleoceanographic changes in the mid latitude Boreal and austral western Pacific

  Hodaka Kawahata, Ken-Ichi Ohkushi, Yasufusa Hatakeyama

  Dec. 1999, Journal of Oceanography, 55(6) (6), 747 - 761, English

  [Refereed]

  Scientific journal


• Abyssal benthic foraminifera from the northwestern Pacific (Shatsky Rise) during the last 298 kyr

  Ken'Ichi Ohkushi, Ellen Thomas, Hodaka Kawahata

  Jan. 1999, Marine Micropaleontology, 38(2) (2), 119 - 147, English

  [Refereed]

  Scientific journal


• Comparison of the fluctuations of primary productivity and biogenic sedimentations in the boreal and austral middle latitudes of the western Pacific during the late Pleistocene

  KAWAHATA Hodaka, OHKUSHI Ken-ichi, HATAKEYAMA Yasufusa

  The Geological Society of Japan, 1998, Annual Meeting of the Geological Society of Japan, 1998, 190 - 190, Japanese


• 254 Paleoceanography of the Oyashio area: record of bathyal benthic foraminifera since the last glacial period

  OHKUSHI Ken'ichi, NEMOTO Naoki

  The Geological Society of Japan, 1996, Annual Meeting of the Geological Society of Japan, 1996, 215 - 215, Japanese


• 8. Foraminifers of the Daishaka Formation in northeastern margine of Tsugaru Basin,Aomori Prefecture,Northeast Japan

  NEMOTO Naoki, KAMEMARU Ayahide, OKUSHI Kenichi

  The Geological Society of Japan, 1994, Annual Meeting of the Geological Society of Japan, 1994, 43 - 43, Japanese

• Research project for varve sediment cores collected from Lake Harutori, Kushiro City, eastern Hokkaido: primary research results and future prospects

  七山太, 香月興太, 松野佑香, 中西利典, 福與直人, 酒井恵祐, 深津恵太, 石井正之, 重野聖之, 大串健一, 古川竜太, 小田啓邦

  2023, 日本地球惑星科学連合大会予稿集(Web), 2023


• Pollen analysis of the Jomon transgression using sediments from Lake Harutori, eastern Hokkaido, Northeast Japan

  酒井恵祐, 中西利典, 藤木利之, 七山太, 大串健一

  2022, 日本第四紀学会講演要旨集, 52 (Web)


• The preliminary study about vegetation change associated during the Jomon transgression based on a pollen analysis of a Lake Harutori sediment core, eastern Hokkaido

  酒井恵祐, 中西利典, 藤木利之, 七山太, 大串健一

  2022, 日本地球惑星科学連合大会予稿集(Web), 2022


• 最終退氷期以降の北西太平洋における底生有孔虫のOMZ変動に対する生物応答

  酒井恵祐, 大串健一, 芝原暁彦

  2020, 日本第四紀学会講演要旨集, 50 (CD-ROM)


• Contrasting seasonal dynamics of nitrate and sulfate in Chikusa River watershed, Hyogo, Japan

  藤吉麗, 陀安一郎, 藪崎志穂, 原口岳, 由水千景, 大串健一, 古川文美子, 伊藤真之, 山本雄大, 横山正, 三橋弘宗

  2020, 日本生態学会大会講演要旨(Web), 67th


• いろいろな元素からみえる千種川水系の姿

  藤吉 麗, 陀安 一郎, 藪崎 志穂, 原口 岳, 由水 千景, 大串健一, 古川文美子, 伊藤真之, 山本雄大, 横山 正

  Mar. 2019, 共生のひろば 14号, (4) (4), 115, Japanese

  Meeting report


• 安定同位体比を用いた兵庫県千種川流域における硫酸,硝酸イオンの起源と動態研究

  藤吉麗, 陀安一郎, 薮崎志穂, 原口岳, 由水千景, 大串健一, 古川文美子, 伊藤真之, 山本雄大, 横山正, 三橋弘宗

  2019, 日本生態学会大会講演要旨(Web), 66th


• 安定同位体比を用いた兵庫県千種川流域における硫酸イオンおよび硝酸イオンの起源と動態の研究

  藤吉麗, 陀安一郎, 藪崎志穂, 原口岳, 由水千景, 大串健一, 古川文美子, 伊藤真之, 山本雄大, 横山正, 三橋弘宗

  2018, 日本陸水学会大会講演要旨集, 83rd


• 硫酸イオンの硫黄安定同位体比および硝酸イオンの窒素・酸素安定同位体比を用いた兵庫県千種川流域における溶存イオンの動態研究

  藤吉麗, 大串健一, 山本雄大, 陀安一郎, 横山正, 三橋弘宗, 古川文美子, 伊藤真之

  2018, 日本地球惑星科学連合大会予稿集(Web), 2018


• 千種川流域の環境教育に寄与する水環境マップ作成の試み

  大串健一, 伊藤真之, 山本雄大, 陀安一郎, 藪崎志穂, 藤吉麗, 横山正, 三橋弘宗

  2017, 全国地学教育研究大会・日本地学教育学会全国大会講演予稿集, 2017-71st


• 兵庫県千種川の水質に関する地球化学的研究

  山本雄大, 陀安一郎, 中野孝教, 角皆潤, 中川書子, 横山正, 三橋弘宗, SHIN Ki-Cheol, 藪崎志穂, 太田民久, 大串健一

  2017, 日本地球惑星科学連合大会予稿集(Web), 2017


• 芝原暁彦「様々な化石の特徴、発掘方法、新しい調べ方がわかる 化石観察入門」成文堂新光社

  OHKUSHI KEN-ICHI

  Nov. 2014, 地学教育, 67(3) (3), 124, Japanese

  Book review


• 有孔虫から海洋環境の変遷をさぐる

  根本 直樹, 大河原 にい菜, 大串 健一

  The Association for the Geological Collaboration in Japan, 2008, 地学団体研究会, 地球科学, 62巻 6号,(409頁～414頁)(6) (6), 409 - 414, Japanese

  [Refereed]

  Introduction scientific journal


• Geology and foraminiferal fossils in Magonai district, Aomori City, Aomori Prefecture, Northeast Japan

  Ohkushi Ken'ichi, Nemoto Naoki

  Hirosaki University, Aug. 2006, Bulletin of the Faculty of Science and Technology Hirosaki University, 9(1) (1), 41 - 55, Japanese


• High-resolution paleo-environmental changes in the Northwestern Pacific during the late Quaternary

  Y Ishizaki, H Kawahata, K Ohkushi

  Sep. 2003, GEOCHIMICA ET COSMOCHIMICA ACTA, 67(18) (18), A175 - A175, English

  Summary international conference


• Paleoenvironmental change of the northwestern North Pacific based on the assemblages of planktonic foraminifera

  Kuroyanagi Azumi, Kawahata Hodaka, Ohkushi Kenichi, Narita Hisashi, Minami Hideki, Hoshiba Mayumi

  The Geological Society of Japan, 2003, Annual Meeting of the Geological Society of Japan, 2003(0) (0), 49 - 49, Japanese


• Radiocarbon ages of benthic foraminifera and planktic foraminifera in deep-sea sediments of the Shatsky Rise

  Ohkushi Kenichi, Shibata Yasuyuki, Yoneda Minoru

  国立環境研究所, 2002, Annual report of NIES-TERRA, 3, 34 - 41, English


• 北西部北太平洋表層堆積物中有機分子(アルケノン,脂肪酸,炭化水素)の分子レベル放射性炭素年代決定

  内田昌男, 柴田康行, 河村公隆, 熊本雄一郎, 米田穣, 大串健一, 向井人史, 原田尚美, 森田昌敏

  2001, 日本地球化学会年会講演要旨集, 2001


• 北西部北太平洋表層堆積物中有機分子(アルケノン,脂肪酸,炭化水素)の分子レベル放射性炭素年代決定

  内田昌男, 原田尚美, 熊本雄一郎, 阿波根直一, 木元克典, 柴田康行, 米田穣, 大串健一, 河村公隆

  2001, みらいシンポジウム予稿集, 5th


• Paleoceanography of the Oyashio Area during the Last 20,000 Years Based on Benthic Foraminifera

  OHKUSHI Ken'ichi, NEMOTO Naoki, MURAYAMA Masafumi, NAKAMURA Toshio, TSUKAWAKI Shinji

  Benthic foraminifera in two cores, ST-5 and ST-21, collected from the Oyashio area show paleoenvironmental changes during the last 20, 000 years. Benthic foraminif eral fauna from both cores exhibit large changes during the last glacial-Holocene transition. Glacial fauna of core ST-5 closely resemble modern fauna living around a depth of 2, 000m under the confluence zone between the Kuroshio and Oyashio currents. This indicates that glacial paleoenvironments off Erimo Cape were similar to recent deep-water conditions under the confluence zone. However, Holocene fauna of core ST-5 show that carbonate dissolution has intensified in depths near 2, 000m. Glacial fauna of core ST-21 demonstrate that intermediate waters that originated from the northern North Pacific had intensified around a depth of 1, 000m. Middle and late Holocene fauna of core ST-21 reflect a low-oxygen condition similar to intermediate waters in the recent Oyashio area, although the area's oxygen level temporarily increased during the middle Holocene.

  日本第四紀学会, 01 Oct. 2000, The Quaternary Research (Daiyonki-Kenkyu), 39(5) (5), 427 - 438, Japanese


• 北西部北太平洋表層堆積物中脂肪酸分子の個別放射性炭素年代決定

  内田昌男, 柴田康行, 河村公隆, 熊本雄一郎, 米田穣, 大串健一, 広田正史, 日下部正志, 森田昌敏

  2000, 日本地球化学会年会講演要旨集, 2000

• キーワード 人間と発達

  大串 健一

  Joint work, 大学教育出版, 2006, Japanese

  Scholarly book

• 有孔虫の酸素同位体比に基づく過去10,000 年間の下北半島東方沖の古環境推定

  酒井恵祐, 大串健一, 池原実, 木元克典, 内田昌男

  令和５年度 高知大学 海洋コア国際研究所 共同利用・共同研究 成果発表会 2024年2月29日, Feb. 2024

  Oral presentation


• 北海道春採湖における完新世前期～中期の高時間分解能に基づく古植生復元

  酒井恵祐, 中西利典, 藤木利之, 七山 太, 大串健一

  日本第四紀学会2023年大会, Sep. 2023


• Salinity, oxygen isotope, hydrogen isotope, and radiocarbon of coastal seawater of North Japan

  窪田 薫, 酒井 恵祐, 大串 健一, 樋口 富彦, 白井 厚太朗, 南 雅代

  日本地球惑星科学連合2023年大会, May 2023

  Oral presentation


• 釧路市春採湖から採取された年縞堆積物コアの解析計画：１次的な研究成果と今後の展望

  七山 太, 香月 興太, 松野 佑香, 中西 利典, 福與 直人, 酒井 恵祐, 深津 恵太, 石井 正之, 重野 聖之, 大串 健一, 古川 竜太, 小田 啓邦

  日本地球惑星科学連合2023年大会, May 2023


• 花粉分析に基づく北海道春採湖における過去8,500年間の植生変遷

  酒井 恵祐, 中西 利典, 藤木 利之, 七山 太, 大串 健一

  日本地球惑星科学連合2023年大会, May 2023

  Oral presentation


• 北海道釧路市春採湖における縄文海進期の植生変遷

  酒井恵祐, 中西利典, 藤木利之, 七山 太, 大串健一

  国際火山噴火史情報研究集会2022–2, Mar. 2023


• 北海道東部，春採湖で得られた堆積物を用いた縄文海進期の花粉分析

  酒井恵祐, 中西利典, 藤木利之, 七山 太, 大串健一

  日本第四紀学会2022年大会, Aug. 2022


• 北海道東部，春採湖湖底堆積物の花粉分析による縄文海進期の植生変遷についての予察的研究

  酒井恵祐, 中西利典, 藤木利之, 七山太, 大串健一

  日本地球惑星科学連合2022年大会, May 2022


• 完新世の底生有孔虫群集による北西太平洋のOMZの変動記録および将来予測に向けた研究

  酒井恵祐, 大串健一, 芝原暁彦

  日本古生物学会2021年年会, Jul. 2021, Japanese

  Poster presentation


• 太平洋の溶存酸素極小層の時空間変動モデル構築に向けた予察的研究

  酒井恵祐, 大串健一, 芝原暁彦

  国際火山噴火史情報研究集会, Apr. 2021


• 最終退氷期以降の北西太平洋における底生有孔虫のOMZ変動に対する生物応答

  酒井恵祐, 大串健一, 芝原暁彦

  日本第四紀学会2020年大会, Dec. 2020

  Poster presentation


• 苫小牧沖における最終退氷期以降の底生有孔虫群集と溶存酸素極小層(OMZ)の変動

  酒井恵祐, 大串健一, 芝原暁彦

  日本地球化学会第67回年会, Nov. 2020

  Poster presentation


• Analysis from Benthic foraminifera populations of expansion and intensify of the northwestern Pacific oxygen minimum zone during the last deglaciation

  Keisuke Sakai, Ken'ichi Ohkushi, Akihiko Shibahara

  JpGU - AGU Joint Meeting 2020, May 2020

  Poster presentation


• 兵庫県千種川流域における硝酸イオンおよび硫酸イオンの季節的動態の比較

  藤吉 麗、陀安 一郎、藪崎 志穂、 原口 岳、由水 千景、大串 健一、古川 文美子、伊藤 真之、山本 雄大、横山 正、三橋 弘宗

  第67回日本生態学会大会, Mar. 2020

  Oral presentation


• 有孔虫分析により明らかになった最終退氷期における北 西太平洋の溶存酸素極小層(OMZ)の拡大

  酒井恵祐・大串健一・芝原暁彦

  日本古生物学会 第169回例会, Feb. 2020

  Poster presentation


• クック諸島ラロトンガ島カレカレ湿原の 海成堆積物から得られた巻貝と有孔虫化石についての予察的研究

  酒井恵祐・大串健一・藤木利之・奥野充・ 森脇広・河合渓・中村俊夫

  国際火山噴火史情報研究集会 EHAI 2019-, Jan. 2020

  Oral presentation


• 北海道苫小牧沖海底堆積物の底生有孔虫群集から明らかになった Bølling / Ållerød温暖期の急激な海底貧酸素化

  酒井恵祐・大串健一・芝原暁彦

  国際火山噴火史情報研究集会 EHAI 2019-2, Jan. 2020

  Oral presentation


• 兵庫県千種川流域における 硝酸イオンおよび硫酸イオンの 季節的動態の比較

  藤吉 麗、陀安 一郎、藪崎 志穂、 原口 岳、由水 千景、大串 健一、古川 文美子、伊藤 真之、山本 雄大、横山 正、三橋 弘宗

  第10回同位体環境学シンポジウム, Dec. 2019

  Poster presentation


• 兵庫県千種川河川水および流域の降水の酸素･水素安定同位体比の特徴

  八杉和輝, 陀安一郎,藪崎志穂,大串健一,横山正,三橋弘宗,藤吉麗,古川文美子,伊藤真之

  第9回 同位体環境学シンポジウム, Dec. 2019

  Poster presentation


• Dynamics of sulfate and nitrate inferred from stable isotope techniquesin Chikusa river watershed, Hyogo Prefecture

  Lei Fujiyoshi, Ichiro Tayasu, Shiho Yabusaki, Takashi F. Haraguchi, Chikage Yoshimizu ,Kenichi Ohkushi, Fumiko Furukawa, Masayuki Itoh, Yudai Yamamoto, Tadashi Yokoyama, Hiromune Mitsuhashi

  日本地球惑星科学連合2019年大会, May 2019

  Oral presentation


• The hydrogen and oxygen isotopic compositions of water in the Chikusa River

  Ken'ichi Ohkushi, Shiho Yabusaki, Ichiro Tayasu, Lei Fujiyoshi, Takanori Nakano, Ki-Cheol Shin, Tadashi Yokoyama, Hiromune Mitsuhashi, Masayuki Itoh, Kazuki Yasugi

  JpGU Meeting 2019, May 2019

  Oral presentation


• 安定同位体比を用いた兵庫県千種川流域における 硫酸、硝酸イオンの起源と動態研究

  FUJIYOSHI REI, TAYASU ICHIRO, YABUSAKI SHIHO, 原口 岳, 由水 千景, OHKUSHI KEN-ICHI, FURUKAWA FUMIKO, ITOH MASAYUKI, 山本 雄大, 横山 正, 三橋 弘宗

  第66回日本生態学会大会, Mar. 2019, Japanese, 神戸国際会議場, Domestic conference

  Poster presentation


• いろいろな元素からみえる千種川水系の姿

  藤吉 麗, 陀安 一郎, 藪崎 志穂, 原口 岳, 由水 千景, 大串健一, 古川文美子, 伊藤真之, 山本雄大, 横山 正

  第14回共生のひろば, Feb. 2019, Japanese, 三田, Domestic conference

  Poster presentation


• 千種川の水素・酸素同位体比の特徴

  大串健一, 陀安一郎, 藪崎 志穂, 藤吉 麗, 申 基澈, 横山 正, 三橋弘宗, 八杉 和輝, 古川 文美子, 伊藤 真之

  第8回同位体環境学シンポジウム, Dec. 2018, Japanese, 京都, Domestic conference

  Poster presentation


• Dynamics of sulfate and nitrate inferred from stable isotope techniques in Chikusa river watershed, Hyogo Prefecture

  藤吉 麗, 陀安 一郎, 藪崎 志穂, 原口 岳, 由水 千景, OHKUSHI KEN-ICHI, FURUKAWA FUMIKO, 山本 雄大, ITOH MASAYUKI, 横山 正, 三橋 弘宗

  同位体環境学シンポジウム, Dec. 2018, Japanese, 総合地球環境学研究所（京都）, Domestic conference

  Poster presentation


• 安定同位体比を用いた兵庫県千種川流域における硫酸イオンおよび 硝酸イオンの起源と動態の研究

  藤吉 麗, 陀安 一郎, 薮崎 志穂, 原口 岳, 由水 千景, OHKUSHI KEN-ICHI, FURUKAWA FUMIKO, ITOH MASAYUKI, 山本 雄大, 横山 正, 三橋 弘宗

  日本陸水学会第83回大会, Oct. 2018, Japanese, 岡山大学, Domestic conference

  Poster presentation


• 硫酸イオンの硫黄安定同位体比および 硝酸イオンの窒素・酸素安定同位体比を用いた 兵庫県千種川流域における溶存イオンの動態研究

  藤吉 麗, OHKUSHI KEN-ICHI, 山本 雄大, 陀安 一郎, 横山 正, 三橋 弘宗, FURUKAWA FUMIKO, ITOH MASAYUKI

  日本地球惑星科学連合2018年大会, May 2018, Japanese, 幕張メッセ, Domestic conference

  Oral presentation


• 兵庫県千種川における水安定同位体比の特徴

  大串健一, 陀安一郎, 藪崎 志穂, 藤吉 麗, 山本雄大, 中野 孝教, 申 基澈, 横山 正, 三橋弘宗, 伊藤真之

  日本地球惑星科学連合2018年大会, May 2018, Japanese, 幕張, Domestic conference

  Poster presentation


• 千種川流域における溶存イオンの起源と動態

  藤吉 麗, 大串健一, 山本雄大, 陀安一郎, 横山 正, 三橋弘宗, 古川文美子, 伊藤真之

  第１３回共生のひろば, Feb. 2018, Japanese, 三田, Domestic conference

  Poster presentation


• Spatial variation of stable sulfur isotope ratios of sulfate in Chikusa River

  藤吉 麗, OHKUSHI KEN-ICHI, 山本雄大, 陀安一郎, 横山 正, 三橋 弘宗, FURUKAWA FUMIKO, ITOH MASAYUKI

  同位体環境学シンポジウム, Dec. 2017, Japanese, 総合地球環境学研究所（京都）, Domestic conference

  Poster presentation


• 兵庫県千種川における硫酸イオンの硫黄安定同位体比の空間分布

  藤吉 麗, 大串健一, 陀安一郎, 横山 正, 三橋弘宗, 古川文美子, 伊藤真之

  第7回同位体環境学シンポジウム, Dec. 2017, Japanese, 京都, Domestic conference

  Poster presentation


• 千種川の水素・酸素同位体比 ー2017年8月の結果

  大串健一, 陀安一郎, 藪崎志穂, 藤吉 麗, 申 基澈, 横山 正, 三橋弘宗, 古川文美子, 伊藤真之

  第7回同位体環境学シンポジウム, Dec. 2017, Japanese, 京都, Domestic conference

  Poster presentation


• 兵庫県千種川流域の環境教育に寄与する水環境マップ作成の試み

  大串健一, 伊藤真之, 山本雄大, 陀安一郎, 藪崎志穂, 藤吉 麗, 横山 正, 三橋弘宗

  日本地学教育学会第71回全国大会, Sep. 2017, Japanese, 神戸, Domestic conference

  Poster presentation


• 兵庫県千種川の水質に関する地球化学的研究

  山本雄大, 陀安一郎, 中野孝教, 角皆潤, 中川書子, 横山 正, 三橋弘宗, SHIN Ki-Cheol, 藪崎志穂, 太田民久, 大串健一

  JpGU-AGU Joint Meeting 2017, May 2017, Japanese, 幕張, Domestic conference

  Poster presentation


• 兵庫県千種川の水質に関する地球化学的研究

  山本雄大, 陀安一郎, 中野孝教, 横山 正, 申 基澈, 藪崎志穂, 太田民久, 三橋弘宗, OHKUSHI KEN-ICHI, 藤澤未雪, 伊藤 真之, 蛯名 邦禎

  同位体環境学シンポジウム, Dec. 2016, Japanese, 京都, Domestic conference

  Poster presentation


• The geochemical and stable isotope characteristics of the Chikusa River in Hyogo Prefecture

  OHKUSHI KEN-ICHI, 中野孝教, 陀安一郎, 横山 正, 太田民久, 草野由貴子, 三橋弘宗, 伊藤真之, 蛯名邦禎

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

  Poster presentation


• 兵庫県千種川流域圏における水環境マップ作成（予報）

  OHKUSHI KEN-ICHI, 中野 孝教, 陀安 一郎, 横山 正, 三橋 弘宗, 草野 由貴子, 太田 民久, 野村 麻衣, 伊藤 真之, 蛯名 邦禎

  第5回 同位体環境学シンポジウム, Dec. 2015, Japanese, 京都, Domestic conference

  Poster presentation


• 北海道苫小牧沖における過去16000 年間の古海洋環境変遷に関する研究

  Hara Naoki, Setoguchi Takashi, OHKUSHI KEN-ICHI, Ikehara Minoru, Ahagon Naokazu

  2014年度古海洋シンポジウム, Jan. 2015, Japanese, Domestic conference

  Poster presentation


• 北海道苫小牧沖で得られたコアの有孔虫酸素同位体比に基づく古海洋環境変遷

  Naoki Hara, Takashi Setoguchi, OHKUSHI KEN-ICHI, Minoru Ikehara, Naokazu Ahagon

  日本古生物学会第 164 回例会, Jan. 2015, Japanese, 愛知県, Domestic conference

  Oral presentation


• ２０１１年東北地方太平洋沖地震による津波堆積物中の有孔 虫・粒度組成―久慈市、東松島市・石巻市の事例

  瀬尾菜々美, OHKUSHI KEN-ICHI

  日本古生物学会例会, Jan. 2014, Japanese, 兵庫県立人と自然の博物館, Domestic conference

  Poster presentation


• 有孔虫酸素同位体比に基づ く最終氷期以降の北海道沖の海洋環境変遷

  瀬戸口貴志, OHKUSHI KEN-ICHI, 池原 実, 内田昌男, 阿波根直一

  日本古生物学会例会, Jan. 2014, Japanese, 兵庫県立人と自然の博物館, Domestic conference

  Poster presentation


• 最終退氷期の北太平洋 における溶存酸素極小層の発達 -底生有孔虫群集の解析-

  OHKUSHI KEN-ICHI, 岩本綾音, 竜田泰行, 野村慎也, 阿波 根直一, 内田昌男, 本山 功

  日本古生物学会2013年年会, Jun. 2013, Japanese, 熊本大学, Domestic conference

  Oral presentation


• 有孔虫解析に基づくコスタリカ沖東太平洋の第四紀海洋環境変動

  OHKUSHI KEN-ICHI, 大音香織, 岩永朋子, 池原 実

  日本古生物学会, Jan. 2013, Japanese, 横浜国立大学, Domestic conference

  Oral presentation


• 北極海チュクチライズ海底堆積物コアの磁気層序

  TOBI Marina, OKUSHI Kenichi, SUGISAKI Saiko, HYODO Masayuki

  地球電磁気・地球惑星圏学会第132回総会・講演会, Oct. 2012, Japanese, 地球電磁気・地球惑星圏学会, 札幌コンベンションセンター, Domestic conference

  Poster presentation


• IODP-CRISPプロジェクトによりコスタリカ沖東太平洋から採取された掘削コアの古海洋学研究

  OHKUSHI KEN-ICHI, 大音香織, 岩永朋子, Vannucchi Paola, 氏家恒太郎, IODP Expeditio, Scientific Party

  日本地質学会, Sep. 2012, Japanese, 大阪府立大学, Domestic conference

  Oral presentation


• 北極海チュクチライズ海底堆積物コアの磁気層序に関する予察的研究

  TOBI Marina, OKUSHI Kenichi, SUGISAKI Saiko, HYODO Masayuki

  日本地球惑星科学連合2012年大会, May 2012, Japanese, 日本地球惑星科学連合, 幕張メッセ, Domestic conference

  Poster presentation


• Preliminary results of paleoceanographic study of IODP Expedition 334

  OHKUSHI KEN-ICHI, Paola Vannucchi, Kohtaro UJIIE, IODP Expeditio, Scientific Party

  日本地球惑星科学連合大会, May 2012, Japanese, 幕張メッセ, Domestic conference

  Poster presentation


• Changes in chemical compositions of sea-salt collected at Mt. Rokko

  Shohei Mukai, 大串 健一

  International symposium on aerosol studies explored by electron microscopy, Feb. 2012, English, Meteorological Research Institute, International conference

  Poster presentation


• 六甲山における海塩粒子における化学組成変化

  向井 将平, 大串 健一

  ２０１１年度大気環境学会近畿支部研究発表会, Jan. 2012, Japanese, Domestic conference

  Oral presentation


• 夏季の六甲山におけるエアロゾルの個別粒子分析

  向井 将平, 大串 健一

  神戸大学若手フロンティア研究会, Dec. 2011, Japanese, 神戸大学, Domestic conference

  Poster presentation


• 夏季と冬季に六甲山で採取したエアロゾルの個別粒子分析

  向井 将平, 大串 健一

  第28 回エアロゾル科学・技術研究討論会, Aug. 2011, Japanese, 大阪府立大学, Domestic conference

  Poster presentation


• Spatial scaling of deglacial hypoxia in the Santa Barbara Basin: Using rank-abundance curves and kurtosis to understand paleoecological community stress

  Myhre, S, Hill, T M, 大串 健一, Kennett JP, Behl, R J

  AGU Fall Meteting, 2011, English, San Francisco, International conference

  Poster presentation


• Paleoceanographic changes in the subarctic Northwest Pacific during the last deglaciation

  Boo-Keun Khim, Ikehara, K, Sagawa, T, 大串 健一, Shibahara, A, Yamamoto, M

  Kochi International Symposium on Paleoceanography and Paleoenvironment in East Asia, 2011, English, 高知大学, International conference

  Poster presentation


• Accelerated subduction erosion opposite the Cocos Ridge: Implications for the initiation of ridge subduction

  Sak, P.B, Vannucchi, P, 大串 健一, Ujiie, K, IOD, Scientific Party

  AGU Fall Meeting, 2011, English, San Francisco, International conference

  Poster presentation


• Constraining the vertical movement of OMZ waters in Santa Barbara Basin for the past 15 ky

  Myhre, S, Hill, T. M, Kennett, J.P, Behl, R.J, 大串 健一

  AGU Fall Meeting 2010, Dec. 2010, English, San Fransicso, International conference

  Poster presentation


• 2009年北極海における海氷および生物地理学における植物プランクトン群集およびサイズ変化について

  今野 進, 大串 健一, 西野 茂人, Jordan R

  Blue Earth’10, Mar. 2010, Japanese, 東京海洋大学, Domestic conference

  Poster presentation


• 最終氷期から完新世にかけての北海道南東沖の海洋環境変動

  大串 健一, 池原 実, 内田 昌男, 阿波根 直一, 木元 克典

  平成21年度高知大学海洋コア総合研究センター大学全国共同利用研究成果発表会, Jan. 2010, Japanese, 東京大学, Domestic conference

  Oral presentation


• , Investigating a transect of anoxic waters in the Santa Barbara Basin during the past 15 ka

  Myhre, S, Hill, T. M, Kennett, J.P, Behl, R.J, 大串 健一

  AGU Fall Meeting 2009, Dec. 2009, English, San Francisco, International conference

  Poster presentation


• 苫小牧沖海底コアの解析に基づく最終氷期以降の環境変動

  大串 健一, 池原 実, 内田 昌男, 阿波根 直一, 木元 克典

  平成20年度高知大学海洋コア総合研究センター全国共同利用研究成果発表会, Jan. 2009, Japanese, 東京大学, Domestic conference

  Oral presentation


• 有孔虫からみた大阪湾の環境変遷

  大串 健一

  六甲山・大阪湾周辺の地域環境を考える, Mar. 2008, Japanese, 神戸大学, 神戸, Domestic conference

  Oral presentation


• 後期更新世のベーリング海グリーンベルトにおける生物地球化学サイクル:

  板木 拓也, 内田 昌男, KHIM Boo-Keun, KIM Sunghan, Shin Hyeson, 香月 香太, 大串 健一, 多田 隆治

  Blue Earth '08, Mar. 2008, Japanese, 海洋研究開発機構, 横浜, Domestic conference

  Oral presentation


• ベーリング海大陸棚南部における完新世の海洋環境変動と大気循環との相互関係 -MR06-04 航海

  香月 興太, KHIM Boo-KeunO, 板木 拓也, 原田 尚美, 大串 健一, 酒井 英夫, 池田 知将

  Blue Earth '08, Mar. 2008, Japanese, 海洋研究開発機構, 横浜, Domestic conference

  Poster presentation


• Geochemical evidence for millenial-scale variation of intermediate water intensity in the Bering Sea during the last glacial-interglacial cycles-.

  Rella, S, Tada, R, Nagashima, K, Uchida, M, Itaki, T, 大串 健一, Harada, N

  第11回みらいシンポジウム, 2008, English, 横浜, Domestic conference

  Poster presentation


• 最終退氷期の苫小牧沖における海洋変動― 有孔虫同位体比に基づく解析 ―

  大串 健一, 池原 実, 内田 昌男, 木元 克典, 芝原 暁彦, 本山 功

  海洋コア総合研究センター全国共同利用研究成果発表会, Jan. 2008, Japanese, 海洋コア総合研究センター, 高知, Domestic conference

  Oral presentation


• Millennial-Scale Variation of Intermediate Water Intensity in the Bering Sea During the Last Glacial-Interglacial Cycle

  RELLA StephanO, TADA RyujiO, UCHIDA MasaoO, NAGASHIMA KanaO, ITAKI TakuyaO, OOKUSHI Kenichi

  Fall Meeting, Dec. 2007, English, American Geophysical Union, San Francisco, CA, USA, International conference

  Oral presentation


• Linkage between human activity and environments during the mid-Holocene Hypsithermal climatic interval - Changes in human activity at the Sannai-Maruyama ruins in Japan -

  KAWAHATA HodakaO, YAMAMOTO HisashiO, OOKUSHI Kenichi, YOKOYAMA YusukeO, KIMOTO KatsunoriO, YAMAOKA KyokoO

  2007 Fall Meeting, Dec. 2007, English, American Geophysical Union, San Francisco, CA, USA, International conference

  Poster presentation


• Anti-phase variability of North Pacific ventilation and Atlantic overturning circulation during the last deglaciation

  UCHIDA MasaoO, OOKUSHI Kenichi, KENNETT JamesO, EGLINTON TimO, KIMOTO KatsunoriO

  Fall Meeting, Dec. 2007, English, American Geophysical Union, San Francisco, CA, USA, International conference

  Oral presentation


• High-resolution radiolarian analysis for

  ITAKI TakuyaO, KHIM Boo-KeunO, KIM SunghanO, UCHIDA MasaoO, KATSUKI KotaO, OOKUSHI Kenichi, NAGASHIMA KanaO, RELLA StephanO, TADA Ryuji O

  International Symposium on Quaternary Environmental, Nov. 2007, English, 日本第四紀学会, Tsukuba, Japan, International conference

  Oral presentation


• Climate – ocean linkage of Holocene on the

  KATSUKI KotaO, KHIM Boo-KeunO, ITAKI TakuyaO, HARADA NaomiO, OOKUSHI Kenichi, SAKAI HideoO, IKEDA TomoyukiO

  International Symposium on Quaternary Environmental, Nov. 2007, English, 日本第四紀学会, Tsukuba, Japan, International conference

  Poster presentation


• Multi-centuries Scales Sea Surface Environmental Change

  KATSUKI KotaO, KHIM Boo-KeunO, ITAKI TakuyaO, HARADA NaomiO, OOKUSHI Kenichi, SAKAI HideoO, IKEDA TomoshiO

  9th International Conference on Paleoceanography, Sep. 2007, English, Tongji University, Shanghai, China, International conference

  Poster presentation


• サンタバーバラ海盆における過去3万年間の溶存酸素極小層の変遷ー底生有孔虫群集の解析ー

  大串 健一

  日本第四紀学会, Aug. 2007, Japanese, 神戸, Domestic conference

  Poster presentation


• Mid to deep-depth ocean circulation in the western North Pacific during the last glacial maximum- deglacial transition period: evidence from foraminiferal radiocarbon age

  UCHIDA Masao, OOKUSHI Kenichi, KIMOTO Katsunori

  EGU General Assembly, Apr. 2007, English, European Geosciences Union, Vienna, Austria, International conference

  Poster presentation


• 最終氷期以降の北太平洋における溶存酸素極小層の変遷ー底生有孔虫群集の解析ー

  Kenichi Ohkushi, Akihiko Shibahara, James P, kennett, Tessa Hill, Ken Ikehara

  日本地質学会, Sep. 2006, Japanese, 高知, Domestic conference

  Oral presentation


• Millennial-scale paleoceanographic changes off Shimokita Peninsula since the Last Glacial Maximum

  Kenichi Ohkushi, Masao Uchida, Akihiko Shibahara, Mayumi Hoshiba, Ken Ikehara, 米田 穣, Yasuyuki Shibata

  Japan Geoscience Union Meeting, May 2006, Japanese, 幕張, Domestic conference

  Oral presentation


• 放射性炭素年代測定に基づく深海堆積物の堆積年代−−堆積物粒子の攪拌の影響について−−

  Kenichi Ohkushi, Masao Uchida, Ken Ikehara, Minoru Yoneda, Yasuyuki Shibata

  日本堆積学会例会, Mar. 2006, Japanese, 大阪, Domestic conference

  Oral presentation

• 日本第四紀学会


• American Geophysical Union


• 日本堆積学会


• 日本古生物学会


• 日本地質学会

• Study of the response of deep-sea organisms to rapid warming: analysis of benthic foraminifera in the Bering Sea.

  Ohkushi Ken'ichi

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Kobe University, 01 Apr. 2019 - 31 Mar. 2022

  Benthic foraminifera had been studied in the Bering Sea, located in the northern North Pacific Ocean. Especially a response of benthic foraminiferal assemblages to climate change was investigated over the past 60,000 years from marine sediments. The subarctic North Pacific climate from 60,000 to 20,000 years ago was cold, unlike the present warm environment, and was the last glacial period when huge ice sheets grew and collapsed repeatedly in North America. Benthic foraminifera has inhabited the seafloor around a depth of 1000m, where they were under the influence of cold mid-depth water with a temperature of 4°C or lower. Although this depth is currently covered with a minimum dissolved oxygen layer, it is clear that oxygen-depletion events during the last glacial period were repeated with interstadial events on a scale of several millennia.


• 最終氷期最盛期以降の北太平洋中・深層環境の高精度復元

  大串 健一

  学術研究助成基金助成金／基盤研究(C), Apr. 2014 - Mar. 2018, Principal investigator

  Competitive research funding


• Growth History of Oxygen Minimum Zone in Pacific Ocean throughCenozoic

  ITO Takashi, KOMURO Kosei, OHKUSHI Kenーichi, USUI Akira

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Ibaraki University, 2008 - 2010

  In the pelagic sediments, which collected by IODP PEAT cruises, there are no well-laminated and organic rich sediments. This suggests that the lower limit of oxygen minimum zone (OMZ) was shallower than 2700m through the Cenozoic period in the area of the east equator Pacific Ocean. Based on the Os isotope ratios of the Neogene manganese oxides from Tohoku district, the OMZ in the Northwestern Pacific may have developed more than several m.y. through Neogene.


• 北極海の定量的環境復元とグローバルな気候変動との関連性解明に関する研究

  大串 健一

  科学研究費補助金／基盤研究(B), 2008, Principal investigator

  Competitive research funding


• 最終氷期の北西太平洋における環境変動の解明

  大串 健一

  日本学術振興会, 科学研究費助成事業, 奨励研究(A), 筑波大学, 2000 - 2001

  親潮域における最終氷期以降の環境変動を明らかにするために北海道南方沖の漸深海帯から採取されたピストンコア中の底生有孔虫群集を研究した.本研究で使用したコアは,東京大学の研究船淡青丸のKT90-9次航海で採取されたST-21コアである. 最終氷期から完新世にかけて4つの底生有孔虫群集が確認されている.最終氷期の底生有孔虫群集は,Epistominella pacificaの産出により特徴づけられる.この種は日本より北方の寒流系中層水域の特徴種といえる.したがって,この種の産出は,北方起源の中層水が最終氷期に強化されたことを反映している可能性がある.完新世前期の群集は,現在の親潮中層水域の群集と類似する.したがって,この時期に現在のような中層環境の成立が始まったものと推定される.現在の親潮域では,溶存酸素極小層が水深500〜1,800m付近に位置している.さらに,この群集は,貧酸素指標種を多く含んでいる.したがって,この期間は過去16,400年間で溶存酸素量が最も低かったと推定される.完新世中期になると,E.batialeのみが80%近くを占める単純な群集へと変化している.この群集の特徴から推定される海底環境は,現在の親潮域の水深2,000m付近の海底環境に近い可能性がある.完新世後期の群集は,現在の釧路沖の中層水域の現世群集と類似する.したがって,完新世後期には再び低酸素を特徴とする親潮中層水環境が存在したと推定される.