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2002 Fiscal Year Final Research Report Summary

Calcareous nannoflora and carbonate flux variations associatd with the dynamic change of the Western Pacific Warm Pool

Research Project

Project/Area Number 11304032
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

OKADA Hisatake  Hokkaido Univ., Div. Earth and Planetary Sciences, Professor, 大学院・理学研究科, 教授 (80111334)

Co-Investigator(Kenkyū-buntansha) JORDAN Richard  Yamagata Univ., Dept. Earth Environement Associate Professor, 理学部, 助教授 (90260455)
Project Period (FY) 1999 – 2002
Keywordswestern Pacific Warm Pool / Calcareous nannoplankton / Coccolith / Carbonate Flux / Watermass / ENSO
Research Abstract

We have studied the three dimensional distribution of calcareous nannoplankton in the Western equatorial Pacific and have identified, 1) the flora differs across the thermocline in the high-temperature water, warm eutrophic water and warm oligotrophic water regimes, but 2) no floral difference can be seen in the temperate mixed-water regime. By analyzing 485 tropical and subtropical Pacific surface-water samples including 351 samples collected by the Lamont-Doherty Earth Observatory, we have identified seven different floras correlating to different surface trophic levels. The distribution pattern of these floras clearly correspond to the longitudinal gradient in the surface nutrient level, and was the first observation of the longitudinal distribution in nannoplankton flora in a pelagic environment. We have also reported unusual concentration of very small placoliths in a tropical upwelling waters and have indicated paleoceanographic usefulness of these very small taxa.
For the multi-year study of seasonal variations of calcareous nannoplankton in the tropical Pacific using the sediment-trap samples, we have obtained continuously the transition from La Nina to El Nino phases. Although the last batch of samples were just recovered and the analysis is continuing, we are now sure that the Molfino and Mclntyre (1991) Model that is widely used for paleoceanographic reconstructions does not work in the tropical Pacific where the nutricline is quite deep. A new methodology was proposed for a quantitative study of nannofossils in sediment samples, and by using this new technique we have analyzed several Quatemary cores for hgih-resolution paleoceanography.

  • Research Products

    (35 results)

All Other

All Publications (35 results)

  • [Publications] Aizawa, C., Komuro, C., Katsurada, Y., Jordan, R.W.: "Some observations on small, marine centric diatoms, particularly Minidisucus spp. From the Indian Ocean and North Pacific"Diatom Research. (in press). (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tanimoto, M., Aizawa, C., Jordan, R.W.: "Assemblages of living microplankton from the North Pacific Ocean and Bering Sea during July-August 1999"Courier Forschungsinstitut Senckenberg. (in press). (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kleijne, A., Jordan, R.W., Heimdal, B.R., Samtleben, C., Chamberlain, A.H.L., Cros, L.: "Five new species of the coccolithophorid genus Alisphaera (Haptophyta), with notes on their distribution, coccolith structure and taxonomy"Phycologia. 40. 583-601 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hagino, K., Okada, H.: "Morphological observations of living Gephyrocapsa crassipons"Journal of Nannoplankton Research. 23(1). 37 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takahashi, K., Okada, H.: "Paleoceanography for the last 195,000 years in the Solomon Sea (ODP Site 1109) by means of calcareous nannofossils"Marine Micoropaleontology. 42. 45-59 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ishiwatari, R., Houtatsu, M., Okada, H.: "Alkenone-sea surface temperature in the Japan Sea over the past 36 kyr : warm temperatures at the last glacial maximum"Organic Geochemistry. 32. 57-67 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takayama, H., Tada, R., Matsui, T., Iturralde-Vinent, M.A., Oji, T., Tajika, E., Kiyokawa, S., Garcia, D., Okada, H., Hasegawa, T., Toyoda, K.: "Origin of the Penalver Formation in northwestern Cuba and its relation to K/T boundary impact event"Sedimentary Geology. 135. 295-320 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Okada, H.: "An improved filtering technique for calculation of calcareous nannofossil accumulation rates"Journal of Nannoplankton Research. 22(3). 203-204 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hagino, K., Okada, H., Matsuoka, H.: "Spatial dynamics of coccolithophore assemblage in the Equatorial Western-Central Pacific Ocean"Marine Micropaleontology. 39. 53-72 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takahashi, K., Okada, H.: "Environmental control on the biogeography of modern coccolithophores in the southeastern Indian Ocean off the coast of western Australia"Marine Micropaleontology. 39. 73-86 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Okada, H: "Neogene and Quaternary calcareous nannofossils from the Blake Ridge, Sites 994,995 and 997"Proceedings of the ODP, Science Results. 164. 331-341 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nishi, H., Norris, R.D., Okada, H.: "Paleoceanographic changes in the dynamics of subtropical Atlantic surface conditions at Site 997A"Proceedings of the ODP, Science Results. 164. 343-363 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Oba, T., Shikama, A., Okada, H.: "Data Report : oxygen isotopic record of the last 0.8 m.y. at the Blake Ridge, Hole 994C"Proceedings of the ODP, Science Results. 164. 173-175 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ikeda, A., Okada, H., Koizumi, I.: "Data Report : Late Miocene to Pleistocene diatom from the Blake Ridge, Site 997"Proceedings of the ODP, Science Results. 164. 365-376 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Jordan, R.W., Broerse, S., Hagino, K., Kinkel, H., Sprengel, C., Takahashi, K., Young, J.R.: "Taxon lists for studies of modern nannoplankton"Marine Micropaleontology. 39. 309-314 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Jordan, R.W., Winter, A.: "Assemblages of coccolithophorids and other living microplankton off the coast of Puerto Rico during January-May 1995"Marine Micropaleontology. 39. 113-130 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ohkouchi, N., Kawamura, K., Kawahata, H., Okada, H.: "Alkenones in surface sediments from the Central Pacific Ocean"Global Biogechem.Cycles. 13. 695-704 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Siesser, W.G., Jordan, R.W.: "Calcareous Nannofossils"Columbia University Press(in press). (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Aizawa, C., Komuro, C., Katsurada, Y., Jordan, R. W.: "Some observations on small, marine centric diatoms, particularly Minidiscus spp. From the Indian Ocean and North Pacific"Diatom Research. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tanimoto, M., Aizawa, C., Jordan, R. W.: "Assemblages of living microplankton from the North Pacific Ocean and Bering Sea during July-August 1999"Courier Forschungsinstitut Senckenberg. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kleijne, A,. Jordan, R. W., Heimdal, B. R., Samtleben, C., Chamberlain, A. H. L., Cros, L.: "Five new species of the coccolithophorid genus Alisphaera (Haptophyta), whith notes on their distribution coccolith structure and taxonomy"Phycologia. 40. 583-601 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hagino, K., Okada, H.: "Morphological observations of living Gephyrocapsa crassipons"Journal of Nannoplankton Research. 23(1). 37 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takahashi, K., Okada, H.: "Paleoceanography for the last 195,000 years in the Solomon Sea (ODP Site 1109) by means of calcareous nannofossils"Marine Micoropaleontology. 42. 45-59 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ishiwatari, R., Houtatsu, M., Okada, H.: "Alkenone-sea surface temperature in the Japan Sea over the past 36 kyr warm temperatures at the last glacial maximum"Organic Geochemistry. 32. 57-67 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takayama, H., Tada, R., Matsui, T., Iturralde-Vinent, M. A., Oji, T., Tajika, E., Kiyokawa, S., Garcia, D., Okada, H., Hasegawa, T., Toyoda, K.: "Origin of the Penalver Formation in northwestern Cuba and its relation to K/T boundary impact event"Sedimentary Geology. 135. 295-320 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Okada, H.: "An improved filtering technique for calculation of calcareous nannofossil accumulation rates"Journal of Nannoplankton Research. 22(3). 203-204 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hagino, K., Okada, H., Matsuoka, H.: "Spatial dynamics of coccolithophore assemblage in the Equatorial Western-Central Pacific Ocean"Marine Micropaleontology. 39. 53-72 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takahashi, K., Okada, H.: "Environmental control on the biogeography of modern coccolithophores in the southeastern Indian Ocean off the coast of western Australia"Marine Micropaleontology. 39. 73-86 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Okada, H.: "Neogene and Quaternary calcareous nannofossils from the Blake Ridge, Sites 994, 995 and 997"Proceedings of the ODP, Science Results. 164. 331-341 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nishi, H., Norris, R. D., Okada, H.: "Paleoceanographic changes in the dynamics of subtropical Atlantic surface conditions at Site 997A"Proceedings of the ODP, Science Results. 164. 343-363 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Oba, T., Shikama, A., and Okada, H.: "Data Report : Oxygen isotopic record of the last 0.8 m.y. at the Blake Ridge, Hole 994C"Proceedings of the ODP, Science Results. 164. 173-175 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ikeda, A., Okada, H., Koizumi, I.: "Data Report : Late Miocene to Pleistocene diatom from the Blake Ridge, Site 997"Proceedings of the ODP, Science Results. 164. 365-376 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Jordan, R. W., Broerse, S., Hagino, K., Kinkel, H., Sprengel, C., Takahashi, K. & Young, J. R.: "Taxon lists for studies of modem Nannoplankton"Marine Micropaleontology. 39. 309-314 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Jordan, R. W. & Winter, A.: "Assemblages of coccolithophorids and other living microplankton off the coast of Puerto Rico during Janurary-May 1995"Marine Micropaleontology. 39. 113-130 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ohkouchi, N., Kawamura, K., Kawahata, H., Okada, H.: "Alkenones in surface sediments from the Central Pacific Ocean"Global Biogechem. Cycles. 13. 695-704 (1999)

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

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Published: 2004-04-14   Modified: 2021-04-07  

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