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2003 Fiscal Year Final Research Report Summary

Carbon and Oxygen isotope equilibrium between foraminifera test and sea water, its implications for paleoceanography

Research Project

Project/Area Number 13440155
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Stratigraphy/Paleontology
Research InstitutionKochi University

Principal Investigator

MURAYAMA Masafumi  Kochi University, Advanced Marine Core Research Center, Associate Professor, 海洋コア総合研究センター, 助教授 (50261350)

Co-Investigator(Kenkyū-buntansha) OBA Tadamichi  Hokkaido Univ., Graduate School of Environmental Earth Science, Professor, 地球環境科学研究科, 教授 (60013588)
IKEHARA Minoru  Kochi University, Advanced Marine Core Research Center, Assistant Professor, 海洋コア総合研究センター, 助手 (90335919)
YASUDA Hisato  Kochi University, Advanced Marine Core Research Center, Professor, 海洋コア総合研究センター, 教授 (90175646)
Project Period (FY) 2001 – 2003
KeywordsForaminifera / Seawater / Sediment Core / Isotope equilibrium / fractionation / Paleoceanography
Research Abstract

1)We made a high vacuum line to extract the CO2 gas efficiently from seawater. We adopt an efficient extraction method using an ultrasonic bath after 100% phosphoric acid added to seawater. This method can extract rapidly the CO2 gas from seawater only for 6 minutes. The isotope composition of the extraction CO2 gas in each shows same value respectively.
2)We participated the 11 research cruises to collect the seawater, planktonic and benthic foraminifera tests, sediments in the world wide area(around Japan, Indian Ocean, western and eastern Pacific Ocean and so on). These sample sets are closely examined for possible use as a reconstruction of isotope equilibrium between the seawater and foraminifera tests in the past.
3)The seawater and its dwelling depths of three dominant spices of planktonic foraminifera(G.ruber, G.sacculifer, N.dutertrei) were measured carbon and oxygen isotope ratios using a mass spectrometry. As tentative results, the oxygen isotope ratios of the G.ruber, G.sacculifer, N.dutertrei tests are 0.45‰、0.37‰、0.12‰ lighter than that of seawater at the same depths, respectively. Furthermore, oxygen isotope ratios of the G.ruber and G.sacculifer which dwell at the same depth have same difference from that of seawater. Thus, we will be going to measure the isotope ratio between seawater and foraminifera tests at surface and bottom environments. The empirical relations between isotopic disequilibria in carbon(∂^<13>C_<foraminifera>-∂^<13>C_<DIC>) and oxygen isotopes (∂^<18>C_<foraminifera>-∂^<18>C_<DIC>) in the tests and the seawater d18O and d13C of dissolved inorganic carbon(DIC), respectively, will be induced.

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] T.Oba, M.Murayama: "Sea surface temperature and salinity changes in the northwest Pacific since the last glacial maximum?"Journal of Quaternary Science. 19. 335-346 (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Seki, O., M.Ikehara, ほか: "Reconstruction of plaeoproductivity in the Sea of Okhotsk over the last 30 kyrs"Paleoceanography. 19. (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Igarashi, M.Murayama, ほか: "History of Larix forest in Hokkaido and Sakhalin, northeast Asia since the last glacial."Acta Paleontologica Sinica. 41. 524-533 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Narita, M.Sato, S.Tsunogai, M.Murayama, M.Ikehara, ほか: "Opal indicating less productive northwestern North Pacific during the deglacial ages."Geophysical Research Letters. 29. 22-26 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 村山雅史, 安田尚登: "四国沖、大陸斜面堆積物の古環境変動解析と炭素循環へのアプローチ"月刊地球. 号外No.32. 50-55 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 安田尚登ほか(共著): "海と環境"講談社サイエンティッフィク. 244 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Oba, M.Murayama: "Sea surface temperature and salinity changes in the northwest Pacific since the last glacial maximum"Journal of Quaternary Science. 19(4). 335-346 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Seki, O., K.Kawamura, M.Ikehara, T.Nakatsuka, T.Oba: "Variation of alkenone sea surface temperature in the Sea of Okhotsk over the last 85 kyrs"Organic Geochemistry. 35. 347-354 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Seki, O., M.Ikehara K.Kawamura, et al.: "Reconstruction of plaeoproductivity in the Sea of Okhotsk over the last 30 kyrs"Paleoceanography. Vol.19. doi:10.1029-2002PA000808 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Igarashi, M.Murayama, et al.: "History of Larix forest in Hokkaido and Sakhalin, northeast Asia since the last glacial."Acta Paleontologica Sinica. 41. 524-533 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Koizumi, I., Shigg, K., Irino, T., Ikehara, M.: "Diatopm records of the late Holocene in the Okhotsk Sea"Marine Mcropaleontology. 49. 139-156 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kimoto, K., Takaoka, H., Oda, M., Ikehara, M., Matsuoka, H., Oba, T., Taira A.: "Carbonate dissolution and planktonic foraminiferal assemblages observed in three piston cores collected above the lysocline in the western equatorial Pacific"Marine Micropaleontology. 47. 227-251 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Narita, M.Sato, S.Tsunogai, M.Murayama, M.Ikehara, et al.: "Opal indicating less productive northwestern North Pacific during the deglacial ages."Geophysical Research Letters. 29. 22-26 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Harada, T.Kondo, K.Fukuma, M.Uchida, T.Nakamura, M.Iwai, M.Murayama, et al.: "Is amino acid chronology applicable to the estimation of the geological age of siliceous sediments?"Earth Planet.Sci.Lett.. 198. 257-266 (2002)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2005-04-19  

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