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Study on transport of terrestrial organic matter into marginal sea inferred from biomarker and stable isotope analysis of sedimentary organic matter.

Research Project

Project/Area Number 11440164
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section一般
Research Field 地球化学
Research InstitutionHOKKAIDO UNIVERSITY

Principal Investigator

MINAGAWA Masao  Hokkaido University, Grad.Env.Earth.Sci, Prof., 大学院・地球環境科学研究科, 教授 (10250507)

Co-Investigator(Kenkyū-buntansha) MURAYAMA Masafumi  Kouchi University, Mar.Core Cent, Assoc.Prof., 海洋コア研究センター, 助教授 (50261350)
OBA Tadamichi  Hokkaido University, Grad.Env.Earth.Sci, Prof., 大学院・地球環境科学研究科, 教授 (60013588)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥15,300,000 (Direct Cost: ¥15,300,000)
Fiscal Year 2000: ¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1999: ¥11,900,000 (Direct Cost: ¥11,900,000)
KeywordsBiomarker / Carbon isotope / Nitrogen isotope / Sediment / Japan-sea / Paleoceanography / Lake Abashiri / Ice age / 窒素同位体 / アルケノン / ステロール / 炭化水素 / 15N / 13C
Research Abstract

The purpose of this project is to reveal historical changes of an interrelation between marine biological production and terrestrial organic matter flux in the North Pacific ocean and its adjacent seas.
Sediment core samples were collected from various basins such as Shatsky rise in the North Pacific, Lake Abashiri, and the estuary of Changjiang river etc. Geochemical proxies in sedimentary organic matter, such as carbon and nitrogen stable isotopes, n-alkane, alkenone and sterol were analyzed to reconstruct the temporal change of marine biological productivity and atmospheric precipitation of terrestrial biomarkers. We estimated the historical variation of sedimentary flux of marine planktonic components using alkenone as a planktonic molecular markers. The result showed ten times greater accumulation rate of terrestrial organic matter in the last glacial period, suggesting that aeolian dust flux might be increased in the ice age. We studied also a boring core sample from Lake Abashiri that located in east Hokkaido, and found temporal change of sedimentary organic matter in the last 10 k years, indicating that a unique excursion of nitrogen isotope ratio in sedimentary organic matter. The result indicates that δ^<15>N may be useful tool to figure out the climatic change of coastal environment in last 20 k years. The isotopic results of sediment samples from the sourth of Thailand coast indicated that organic carbon and nitrogen isotopic composition have already recorded evidence of recent anthropological activities, urbanization and eutrophication in watershed. A boring core from Changjian river mouth represented that ^<15>N might be enriched in recent soil perhaps due to nitrogen accumulation in the growth of human population. This work successfully indicated that sedimentary organic matters are useful to study temporal change of marine and lacustrine environment since the last glacial period.

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Minagawa M.: "δ15N of PON and nitrate as a clue to the origin and transformation of nitrogen in the subarctic North Pacific and its marginal sea."Journal of Oceanography. (印刷中). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kuramoto T.: "Stable carbon and nitrogen isotopic characterization of organic matter in a man-grove ecosystem on the southwestern coast of Thailand."Journal of Oceanography. (印刷中). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kerherve P.: "Stable isotopes (13C/12C and 15N/14N) in settling organic matter of the north-western Meditteranean sea : biogeochemical implications"oceanologica Acta. 24. S77-S85 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Minagawa, M., Ohashi, M., Kuramoto, T.and Noda, N.: "δ^<15>N of PON and nitrate as a clue to the origin and transformation of nitrogen in the subarctic North Pacific and its marginal sea"J.Oceanograph. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kuramoto, T., and Minagawa M.: "Stable carbon and nitrogen isotopic characterization of organic matter in a mangrove ecosystem on the sourthwestern coast of Thailand."J.Oceanograph. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kerherve, P., Minagawa, M.Heusner, and Monaco, A.: "Stable isotopes (^<13>C/^<12>C and ^<15>N/^<14>N) in settling organic matter of the northwestern Mediterranean sea : biological implications."Oceanologica Acta. 24. S77-S85 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Minagawa M.: "The d15N of PON and nitrate as a clue to study origin and transformation process of nitrogen in the subarctic North Pacific and its marginal sea."Journal of Oceanography. (In press). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Kuramoto T.: "Characterization of organic matters in a mangrove ecosystem at the sourthwestern coast of Thailand inferred from stable carbon and nitrogen isotopes."Journal of Oceanography. (In press). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Kerherve P.: "Stable isotopes (13C/12C and 15N/14N) in settling organic matter of the northwestern Meditteranean sea : biogeochemical implications"Oceanologica Acta.. 24. S77-S85 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 南川雅男: "現代海洋化学II"有機物同位体による古海洋化学環境の解読(印刷中).

    • Related Report
      2000 Annual Research Report
  • [Publications] 南川雅男: "海洋におけるN^<15>分布解釈の再評価"Radioisotopes. 48. 657-659 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Kerherve, P., Minagawa, M., Heussner S., and Monaco A.: "Stable isotopes (13C/12C and 15N/14N) in settling organic matter of the northwestern Mediterranean sea : biogeochemical implications"Oceanologica Acta. (in press).

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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