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Study on Seasonal and Interannual Variations of Surface Circulation in the Sea of Okhotsk using Satellite Observations

Research Project

Project/Area Number 15340152
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionHokkaido University

Principal Investigator

EBUCHI Naoto  Hokkaido Univ., Inst.Low Temp.Sci., Prof., 低温科学研究所, 教授 (10203655)

Project Period (FY) 2003 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥15,900,000 (Direct Cost: ¥15,900,000)
Fiscal Year 2005: ¥4,700,000 (Direct Cost: ¥4,700,000)
Fiscal Year 2004: ¥4,400,000 (Direct Cost: ¥4,400,000)
Fiscal Year 2003: ¥6,800,000 (Direct Cost: ¥6,800,000)
KeywordsSea of Okhotsk / Ocean Surface Circulation / Remote Sensing / East Sakhalin Current / Soya Warm Current / Radar Altimeter / Microwave Scatterometer / High Frequency Ocean Radar
Research Abstract

Seasonal and interannual variations in the surface circulation of the Sea of Okhotsk including the East Sakhalin Current (ESC) are investigated using ten-year records of the sea level anomaly (SLA) observed by the TOPEX/POSEIDON (T/P) altimeter. The T/P SLA clearly documents seasonal and interannual variations in the ESC along the east coast of Sakhalin Island, although sea ice masks the region from January to April. Estimates of surface current velocity anomaly derived from T/P SLA are in good agreement with drifting buoy observations. The ESC is strong in winter, with a typical current velocity of 30-40 cm/s in December, and almost disappears in summer. Southward flow of the ESC is confined to the shelf and slope region and consists of two velocity cores. These features of the ESC are consistent with short-term observations reported in previous studies. Analysis of the ten-year records of T/P SLA confirms that the structure of the ESC is maintained each winter and the seasonal cycle is repeated every year, although the strength of the ESC shows large interannual variations. Seasonal and interannual variations in the ESC are discussed in relation to wind-driven circulation in the Sea of Okhotsk, using wind stress and wind stress curl fields derived from European Centre for Medium Range Weather Forecasts (ECMWF) reanalysis data and a scatterometer-derived wind product. Seasonal and interannual variations of the anticyclonic eddy in the Kuril Basin are also revealed using T/P SLA. Combining the observations by ground-based High frequency (HF) ocean radar, satellite altimetry, coastal tide gauge stations, and a bottom-mounted acoustic Doppler current meter (ADCP), seasonal and interannual variations of the Soya Warm Current is also revealed.

Report

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

    (6 results)

All 2006 2004

All Journal Article (6 results)

  • [Journal Article] Observation of the Soya Warm Current using HF ocean radar2006

    • Author(s)
      Naoto Ebuchi 他7名
    • Journal Title

      Journal of Oceanography 62(1)

      Pages: 47-61

    • NAID

      10017168472

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Seasonal and interannual variations in the East Sakhalin Current revealed by the TOPEX/POSEIDON altimeter data2006

    • Author(s)
      Naoto Ebuchi
    • Journal Title

      Journal of Oceanography 62(2)

      Pages: 171-183

    • NAID

      10017311405

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Observation of the Soya Warm Current using HF ocean radar2006

    • Author(s)
      Ebuchi, N., Y.Fukamachi, K.I.Ohshima, K.Shirasawa, M.Ishikawa, T.Takatsuka, T.Daibo, M.Wakatsuchi
    • Journal Title

      Journal of Oceanography vol.62, no.1

      Pages: 47-61

    • NAID

      10017168472

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Seasonal and interannual variations in the East Sakhalin Current revealed by the TOPEX/POSEIDON altimeter data.2006

    • Author(s)
      Ebuchi, N.
    • Journal Title

      Journal of Oceanography vol.62, no.2

      Pages: 171-183

    • NAID

      10017311405

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Observation of the Soya Warm Current using HF ocean radar2004

    • Author(s)
      N.Ebuchiほか7名
    • Journal Title

      Proceedings of IGARSS 2004 (CD-ROM)

      Pages: 4-4

    • NAID

      10017168472

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Seasonal variation of the Soya Warm Current observed by HF ocean radars2004

    • Author(s)
      N.Ebuchiほか7名
    • Journal Title

      Proceedings of International Symposium on Remote Sensing 2004 (CD-ROM)

      Pages: 4-4

    • Related Report
      2004 Annual Research Report

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

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