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IMPACT OF ENSO AND INDIAN OCEAN DIPOLE MODE (IODM) ON VARIABILITY OF THE OCEANOGRAPHIC PROCESSES IN THE EASTERN TROPICAL INDIAN OCEAN.

Research Project

Project/Area Number 15510011
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Environmental dynamic analysis
Research InstitutionTOKAI UNIVERSITY

Principal Investigator

OKADA Yoshihiro  TOKAI UNIVERSITY, SCHOOL OF MARINE SCIENCE AND TECHNOLOGY, PROFESSOR, 海洋学部, 教授 (70224037)

Project Period (FY) 2003 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2005: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2004: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2003: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsEastern Tropical Indian Ocean / Interannual variability / Indian Ocean Dipole Mode (IODM) / El Nino / Upwelling / Thermocline / Remote Sensing / Sea Surface Temperature (SST) / Ch1-a / Chl-a / 東インド洋熱帯域 / インド洋ダイポールモード / エルニーニョ・ラニーニャ / 人工衛星データ / 湧昇 / 経年変動 / 食物プランクトン / 物理-生物学的プロセス
Research Abstract

In 1999, Indian Ocean Dipole Mode (IODM) was discovered in the Indian Ocean. This phenomenon co-occurred with a strong El Nino event and transformed eastern half of the Indian Ocean equatorial region into an upwelling regime for several months. Such findings made the eastern tropical Indian Ocean region an area of major climatic importance. The purpose of this project is to understand the seasonal evolution and interannual variability of the upwelling phenomena in the eastern tropical Indian Ocean using multi-sensor remote sensing time series data i.e. sea-surface height (SSH), ocean surface winds, sea-surface temperature (SST) and phytoplankton pigment concentration (chlorophyll a) from September 1997 to December 2003. The focus of our research is to monitor impact of the IODM and ENSO on mesoscale physical-biological oceanographic processes in the region. Our results indicated that the eastern tropical Indian Ocean exhibits the largest SST variability, SSH anomaly and the strongest w … More inds during simultaneous occurrence of a strong El Nino and IODM events in 1997-98. Furthermore, there was a significant departure from the 7-year monthly chlorophyll climatology in both magnitude and timing of seasonal response to the SE monsoon. During the peak of the 1997-98 El Nino and IODM, anomalous easterly wind induced strong upwelling and lifted the thermocline to depths much shallower than the climatological mean along the coast of Java resulting higher chlorophyll a concentration and subsequently the high chlorophyll a area extended northwestward along the Sumatra coast. Sequential occurrence of anomalous ocean condition during late-1997, early-1998 and late-1999 was found to be consistent with the evolutionary pattern of the IODM reported earlier. Our results highlight usefulness of multi-sensor remote sensing data in providing significant insight into strong interplay between climatological events and biological oceanographic processes and contribute to furtherance of our understanding of biological production mechanism and pelagic fisheries in the region. Less

Report

(4 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (10 results)

All 2006 2005 2004

All Journal Article (10 results)

  • [Journal Article] Stock assessment of autumn cohort of neon flying squid (Ommastrephes bartramii) in the North Pacific based on past large-scale high seas driftnet fishery data2006

    • Author(s)
      T.Ichii, K.Mahapatra, H.Okamura, Y.Okada
    • Journal Title

      Fisheries Research 78

      Pages: 286-297

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Stock assessment of autumn cohort of neon flying squid (Ommastrephes bartramii) in the North Pacific based on past large-scale high seas driftnet fishery data2006

    • Author(s)
      T.Ichii, K.Mahapatra, H.Okamura, Y.Okada
    • Journal Title

      Fisheries Research Vol.78

      Pages: 286-397

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Remote sensing based observation of ocean conditions and their influence on the Sei Whale distribution in the western South Pacific.2005

    • Author(s)
      K.Kimura, K.Matsuoka, S.Hishiwaki, Y.Okada
    • Journal Title

      Journal of The School of Marine Science and Technology, Tokai University 3(3)

      Pages: 1-12

    • NAID

      110006155429

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Remote sensing based observation of ocean conditions and their influence on the Sei Whale distribution in the western South Pacific.2005

    • Author(s)
      K.Kimura, K.Matsuoka, S.Hishiwaki, Y.Okada
    • Journal Title

      Journal of The School of Marine Science and Technology (Tokai University) Vol.3, No.3

      Pages: 1-12

    • NAID

      110006155429

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Development of PISCES - A User-friendly Software for PC to produce Sea Surface Temperature Maps from High Resolution Satellite Data around Japan.2004

    • Author(s)
      Y.Okada, M.Moriwaki, K.Mahapatra
    • Journal Title

      Bulletin of Japan Society of Fishery Oceanography 68(2)

      Pages: 71-86

    • NAID

      10013145651

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Differing body size between the autumn and the winter-spring cohorts of neon flying squid (Ommastrephes bartramii) related to oceanographic regime in the North Pacific : a hypothesis.2004

    • Author(s)
      T.Ichii, K.Mahapatra, M.Sakai, D.Inagake, Y.Okada
    • Journal Title

      Fisheries Oceanography 13(5)

      Pages: 295-309

    • NAID

      10022590618

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Relationship between the saury fishing ground and sea surface oceanographic features determined from satellite data along the northeastern coast of Japan.2004

    • Author(s)
      N.Kimura, Y.Okada, K.Mahapatra
    • Journal Title

      Journal of The School of Marine Science and Technology, Tokai University 2(2)

      Pages: 1-12

    • NAID

      110006149789

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Development of PISCES - A User-friendly Software for PC to produce Sea Surface Temperature Maps from High Resolution Satellite Data around Japan.2004

    • Author(s)
      Y.Okada, M.Moriwaki, K.Mahapatra
    • Journal Title

      Bulletin of Japan Society of Fishery Oceanography Vol.68, No.2

      Pages: 71-86

    • NAID

      10013145651

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Differing body size between the autumn and the winter-spring cohorts of neon flying squid (Ommastrephes bartramii) related to oceanographic regime in the North Pacific : a hypothesis.2004

    • Author(s)
      T.Ichii, K.Mahapatra, M.Sakai, D.Inagake, Y.Okada
    • Journal Title

      Fisheries Oceanography Vol.13, No.5

      Pages: 295-309

    • NAID

      10022590618

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Relationship between the saury fishing ground and sea surface oceanographic features determined from satellite data along the northeastern coast of Japan.2004

    • Author(s)
      N.Kimura, Y.Okada, K.Mahapatra
    • Journal Title

      Journal of The School of Marine Science and Technology (Tokai University) Vol.2, No.2

      Pages: 1-12

    • NAID

      110006149789

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary

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Published: 2003-04-01   Modified: 2016-04-21  

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