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THE KUROSHIO MOVEMENT AND OCEANIC ENVIRONMENTAL CHANGE FOR THE LAST 150,000 YEARS

Research Project

Project/Area Number 07404028
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Stratigraphy/Paleontology
Research InstitutionHOKKAIDO UNIVERSITY

Principal Investigator

OBA Tadamichi  Hokkaido Univ., Graduate School of Environmental Earth Science, Professor, 大学院・地球環境科学研究科, 教授 (60013588)

Co-Investigator(Kenkyū-buntansha) ODA Motoyoshi  Kumamoto Univ.Fac.of Science, Professor, 理学部, 教授 (60108454)
KOIZUMI Itaru  Hokkaido Univ., Graduate School of Science, Professor, 大学院・理学研究科, 教授 (20029721)
MURAYAMA Masafumi  Hokkaido Univ., Graduate School of Environmental Earth Science, Assistant Profes, 大学院・地球環境化学研究科, 助手 (50261350)
HASEGAWA Shiro  Hokkaido Univ., Graduate School of Environmental Earth Science, Associate Profes, 大学院・地球環境科学研究科, 助教授 (90142918)
MINAGAWA Masao  Hokkaido Univ., Graduate School of Environmental Earth Science, Professor, 大学院・地球環境科学研究科, 教授 (10250507)
Project Period (FY) 1995 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥35,500,000 (Direct Cost: ¥35,500,000)
Fiscal Year 1997: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1996: ¥11,400,000 (Direct Cost: ¥11,400,000)
Fiscal Year 1995: ¥20,600,000 (Direct Cost: ¥20,600,000)
KeywordsKuroshio movement / Oceanic environmental change / Mineral assemblage / Microfossil assemblage / oxygen isotope / Carbon isotope / Nitrogen isotope / Surrounding Japan / 鉱物組織 / 有孔虫 / X線回折 / 群集組成 / 酵素同位体比
Research Abstract

In order to reconstruct the paleoenvironmental changes related to the Kuroshio movement around the Japanese Islands since the last 150,000 years, we have carried out multidisciplinary analysis on about 15 marine sediment cores collected from the surrounding sea areas of Japan. The new results obtained are summarized as follows : 1) From the relative abundance of warm-water planktonic foraminifera in a core off Sanriku district, it has been inferred that the effect of the Kuroshio Current was strong during the oxygen isotopic stages 5._1 and 1, nearly absent during the stages 4 and 2, and sometime observed during the stage 3.2) From faunal and oxygen isotopic analysis of planktonic foraminifera in a core off Kashimanada, it has been revealed that the sea surface temperature(SST)decreased by several to nearly ten degrees Celsius at the last glacial maximum. 3) Compared to the Holocene SST,a decrease of 2-3゚C in SST during the last glacial period is revealed by the UK37-index analyzes in several cores off the southern coast of Japan. The accumulation rates of eolian dust (Quartz, Feldspar, Illite), as well as organic carbon content, increased during the last glacial period than in the Holocene. 4) Nannofossil assemblage in one of the southernmost core (30゚N) off the southern coast of Japan show fluctuations in accordance with the global climatic change since the last 130,000 years. The biological productivity in this core site, however, does not change so much. This suggests that the influence of the Kuroshio Current did not reach as far north as 30゚N during the last 130,000 years. 5) In a core from the Okinawa Trough, the organic carbon and nitrogen isotopic ratios has remained relatively constant since the last 40,000 years. This suggests that the Kuroshio Current has been convected into the Okinawa Trough for the last 40,000 years.

Report

(4 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • 1995 Annual Research Report
  • Research Products

    (30 results)

All Other

All Publications (30 results)

  • [Publications] Oba, T.: "Pleistocene deposit of the Japan Sea" Geology and Geophysics of the Japan Sea Edited by Isezaki.N.et ae. 1. 283-293 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Hyun, S.etal.5 persons: "Geo chemical evidence for spatial paleoproductivity vaniations in the Northwest Paufic(Shikoku Basin)during the last glacial moximum." Journal of Korean Soc. Oceanography. 31.4. 207-216 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Wahyudi and Minagawa.M.: "Response of benthic foramimifera to organic carbon accamulation rates in the Okinawa Trough." Journal of Oceano graphy. 53. 411-420 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 奥村 智 ほか3名: "日本海秋田沖の2本の海底コアの酸素・炭素・窒素同位体比に基づく古環境解析" 第四紀研究. 35.5. 349-358 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Koizumi, I. and Ikeda, A.: "The Plio-Pleistocene diaton record from ODP site 797 of the Japan Sea" Proc.30th Inte. Congr.11. 213-230 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Takemoto, A. and Oda, M.: "New planktonic foraniuniferal transfer functions for the Kuroshio-Oyashio region off Japan" Paleontolyical Research. 1.4. 291-310 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Sawada, K: "Long-chain alkenones and alkyl alkenoates in the castal and Pelagic sediments of the northwest North Pacific with special reference to the reconstruction of Emiliania huxleyi and Gephycocapsa oceanica ratios." Org.Geochem.24. 751-764 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Oba, T.: "Plesitocene deposits of the Japan Sea" In "Geology and Geophysics of the Japan Sea" Eds.Isezaki, N., Bersenev, I.I., Tamaki, K., Karp, B.Ya.And Lelikov, E.P., Terra Scientific Publishing Co.Yokyo. 283-293 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Hyun, S., Ahagon, N., Saito, S., Ikehara, M., Oba, T.and Taira, A.: "Geochemical evidence for spatial paleoproductivity variations in the northwest Pacific (Shikoku Basin) during the last glacial maximum" J.Korean Soc.Oceanogr.31(4). 207-216 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Wahyudi and Minagawa, T.: "Response of benthic foraminifera to organic carbon accumulation rates in the Okinawa Trough" J Oceangr.53. 411-420 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Okumura, S., Minagawa, M., Oba, T.and Ikehara, K.: "Paleoenvironmental analysis of two sediment cores off Akita city in the Japan Sea based on oxygen, carbon and nitrogen isotopes" The Quaternary Research. 35(5). 349-358 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Koizumi, I.and Ikeda, A.: "The Plio-Pleistocene diatom record from ODP Site 797 of the Japan Sea" in W.Naiwen and J.Remane (eds.), Proc.30th Int'l. Congr.VSP,International Science Publishers, Zeist. 11. 213-230 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Takemoto, A.And Oda, M.: "New planktonic foraminiferal transfer functions for the Kuroshio-Oyashio Current region off Japan" Paleontological Res.1(4). 291-310 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Sawada, K., Handa, N., Shiraiwa, Y., Danbara, A.and Montani, S.: "Long-chain alkenones and alkyl alkenoates in the coastal and pelagic sediments of the northwest North Pacific with special reference to the reconstruction of Emiliania huxleyi and Gephyrocapsa oceanica ratios" Org.Geochem.24. 751-764 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Oba,T: "Pleistocene depcsites of the Japan Sea" Gesiogy and Geophysics of the Japan Sea Edited by Isezaki N.et al.1. 283-293 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] Hyan,S.et al.5persons: "Geochemical evidence for spatial paleoproductivity vanations in the Northwest pacific (Shikoku Basin) during the last glacial maximum." Journal of Korean Soc.Oceanography. 31・4. 207-216 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] Wahyudi and Minagawa,M.: "Response of benthic foraminifera to organic carbon accunulation rates in the Okinawa Trough" Journal of Oceanography. 53. 411-420 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 奥村智ほか3名: "日本海秋田沖の2本の海底コアの酸素・炭素・窒素同位体比に基づく古環境解析" 第四紀研究. 35・5. 349-358 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] Tada,R., IrinoT. and Koizumi,I.: "Possible Danagrad-Oeschger oscillation signal eecorded in the Japan Sea sediments" Proceedings of 1994 Sapporo IGBP Symposium Edited by Tsunogai S.et al.517-522 (1995)

    • Related Report
      1997 Annual Research Report
  • [Publications] Takemoto,A. and Oda,M.: "New planktonic foraminiferal transfer functions for the Kuroshio-Oyashio Current region off Japan" Paleontological Research. 1・4. 291-310 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Harada, N. et al., 6 persons: "Age determination of marine sediments in the Western North Pacific by Aopartic and chronology" Journal of Oceanography. 53. 1-7 (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] Oba,T.: "Pleistocene deposits of the Japan Sea" Geology and Geophysisc of the Japan Sea ads. by Isezaki,N. et al.283-293 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 奥村智 ほか3名: "日本海秋田沖の2本の海底コアの酸素・炭素・窒素同位体比に基づく古環境解析" 第四紀研究. 35・5. 349-358 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Harada,N et. al.,5persons: "chronology of marine sediments by the racemization reaction of aspartic acid in planktonic foraminitera" Organic Geochemistry. 24・8/9. 921-930 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Nozaki,Y and Oba,T: "Dissolution of calcareous tests in the ocean and atmospheric carbon dioxide" Biogeochemical Process and Ocean Flux in the Western Pacific.eds.by Sakai,H.and Nozaki,Y.83-92 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Nakasuka,T.et al.,7 persons: "Glacial-interglacial migration of an upwelling field in the western equatorial Pacific recorded by sediment 15N/14N." Geophysical Research Letters. 22. 2525-2528 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 大場忠道ほか3名: "日本海隠岐堆コアの加速器質量分析(AMS)法による^<14>C年代" 第四紀研究. 34. 289-296 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 渡邊剛・大場忠道: "石垣島産現生シャコガイ殻の酸素・炭素同位体比" 月刊地球. 17. 728-730 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 大場忠道ほか7名: "西赤道太平洋の深海底コアKH-92-1、station3と5の基礎的情報" 月刊海洋. 27. 441-446 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 玄相民ほか5名: "西七島海嶺域の古生物生産と堆積物中のバリウムの挙動" 月刊海洋. 27. 466-473 (1995)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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