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Basic study on baroclinic variations of the Kuroshio estimated from IES data

Research Project

Project/Area Number 15340158
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

IMAWAKI Shiro  Kyushu University, Research Institute for Applied Mechanics, Professor, 応用力学研究所, 教授 (40025474)

Co-Investigator(Kenkyū-buntansha) ICHIKAWA Kaoru  Kyushu University, Associate professor, 応用力学研究所, 助教授 (40263959)
UMATANI Shin-ichiro  Kyushu University, Research Associate, 応用力学研究所, 助手 (30112353)
NAKAMURA Hirohiko  Kagoshima University, Faculty of Fisheries, Associate Professor, 水産学部, 助教授 (50284914)
Project Period (FY) 2003 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥11,500,000 (Direct Cost: ¥11,500,000)
Fiscal Year 2005: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2004: ¥4,100,000 (Direct Cost: ¥4,100,000)
Fiscal Year 2003: ¥3,900,000 (Direct Cost: ¥3,900,000)
KeywordsIES (inverted echo sounder) / Kuroshio / Sea-surface dynamic height / Satellite altimeter / Baroclinic transport / 淡青丸航海 / 傾圧密度場 / 黒潮流軸 / 傾圧流速場 / 沿岸水位 / GEM(gravest empirical mode) / 音波往復時間 / 傾圧場
Research Abstract

Vertical profiles of temperature and salinity are estimated by the GEM (gravest empirical mode) method from the IESs (inverted echo sounders) data deployed on coastal and offshore sites off cape Ashizuri, and then sea-surface dynamic height (SSDH) are calculated from those profiles. From difference of these SSDHs, a time series of baroclinic transport of the Kuroshio between these two stations are obtained. The IES-derived SSDH is compared with CTD-derived one ; the rms (root-mean-square) difference is 3.2 cm on the coastal site and 2.5 cm on the offshore site. Meanwhile, comparison between the SSDH anomaly derived from the CTD data and that obtained from the satellite altimetry data results in 3.6 cm and 2.9 cm rms differences on the coastal and offshore sites, respectively. These results confirm that the SSDH determined from the CTD data is closer to that of the IES data than that of the altimetry data. In addition, the steric height component confined in the surface-layer is estimated from the CTD vertical temperature profile as 5 cm in the altimetry but only 2 cm for the IES data.
We also continued to add description on variations of the Kuroshio and to prepare dataset being compared with the IES data. In particular, hydrographic data along the ASUKA observational line off Shikoku are acquired by KT05-23 cruise on R/V Tanseimaru, and the period of the time series is expanded for variations of the Kuroshio axis position estimated from the surface velocity field obtained by combining the altimetry data and surface drifter data. Especially, the latter reveals that variations of the baroclinic transport of the Kuroshio obtained by the IES data are strongly influenced by variations of the Kuroshio axis position.
We made a summary report on our achievements during this 3-year period.

Report

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

    (17 results)

All 2006 2005 2004 Other

All Journal Article (14 results) Publications (3 results)

  • [Journal Article] IESによる四国沖黒潮域における海面力学高度の推定と精度評価2006

    • Author(s)
      柿木康児
    • Journal Title

      九州大学応用力学研究所所報 130

      Pages: 11-20

    • 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] Sea-surface dynamic height of the Kuroshio south of Japan estimated from inverted echo sounders and its error estimation2006

    • Author(s)
      Koji Kakinoki
    • Journal Title

      Rep.Res.Inst.for Applied Mechanics, Kyushu Univ. 130

      Pages: 11-20

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Detecting the Kuroshio axes south of Japan by using altimeter and drifter data2005

    • Author(s)
      Daisuke Ambe
    • Journal Title

      2005 IEEE International Geoscience and Remote Sensing Symposium Proceedings ISBN 0-7803-905 1-2

      Pages: 5424-5427

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Effects of the Kuroshio on coastal sea level south of Japan2005

    • Author(s)
      Zhongzhe Zhang
    • Journal Title

      2005 IEEE International Geoscience and Remote Sensing Symposium Proceedings ISBN 0-7803-905 1-2

      Pages: 5428-5431

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Detecting the Kuroshio axes south of Japan by using altimeter and drifter data2005

    • Author(s)
      Daisuke Ambe
    • Journal Title

      2005 IEEE International Geoscience and Remote Sensing Symposium Proceedings, ISBN 0-7803-9051-2

      Pages: 5424-5427

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Effects of the Kuroshio on coastal sea level south of Japan2005

    • Author(s)
      Zhongzhe Zhang
    • Journal Title

      2005 IEEE International Geoscience and Remote Sensing Symposium Proceedings, ISBN 0-7803-9051-2

      Pages: 5428-5431

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Detecting the Kuroshio axes south of Japan by using altimeter and drifter data2005

    • Author(s)
      Daisuke Ambe
    • Journal Title

      2005 IEEE International Geoscience and Remote Sensing Symposium Proceedings ISBN 0-7803-9051-2

      Pages: 5424-5427

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Effects of the Kuroshio on coastal sea level south of Japan2005

    • Author(s)
      Zhongzhe Zhang
    • Journal Title

      2005 IEEE International Geoscience and Remote Sensing Symposium Proceedings ISBN 0-7803-9051-2

      Pages: 5428-5431

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Influence of the Kuroshio fluctuations on sea level variations along the south coast of Japan2005

    • Author(s)
      Z.Zhang, K.Ichikawa
    • Journal Title

      Journal of Oceanography 60巻(in press)

    • NAID

      40006831463

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Monitoring surface velocity from repeated ADCP observations and satellite altimetry2004

    • Author(s)
      K.Ichikawa, N.Gohda, M.Arai, A.Kaneko
    • Journal Title

      Journal of Oceanography 60巻2号

      Pages: 365-374

    • NAID

      10012724755

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Estimating the Kuroshio axis south of Japan using combination of satellite altimetry and drifting buoys2004

    • Author(s)
      D.Ambe, S.Imawaki, H.Uchida, K.Ichikawa
    • Journal Title

      Journal of Oceanography 60巻2号

      Pages: 375-382

    • NAID

      10012724777

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 四国沖の黒潮の流量の時系列データ2004

    • Author(s)
      内田 裕, 今脇資郎
    • Journal Title

      月刊 海洋 号外 37巻

      Pages: 22-29

    • Related Report
      2004 Annual Research Report
  • [Journal Article] IES観測による四国沖黒潮域の海面力学高度の時間変化の推定2004

    • Author(s)
      柿木康児, 今脇資郎, 内田 裕, 中村啓彦, 馬谷紳一郎, 仁科文子, 市川洋, M.Wimbush
    • Journal Title

      月刊 海洋 号外 37巻

      Pages: 30-40

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 東シナ海およびトカラ海峡での黒潮の変動2004

    • Author(s)
      中村啓彦, 仁科文子, 市川 香, 市川 洋, H.-J.Lie
    • Journal Title

      月刊 海洋 号外 37巻

      Pages: 106-126

    • Related Report
      2004 Annual Research Report
  • [Publications] S.Imawaki, H.Uchida, K.Ichikawa, D.Ambe: "Estimating the high-resolution mean sea-surface velocity field by combined use of altimeter and drifter data for geoid model improvement"Space Science Reviews. 108. 195-204 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Kashima, S.Imawaki, S.Umatani, H.Uchida, Y.Hashibe, H.Ichikawa, M.Fukasawa: "Geostrophy in the intermediate and deep layers of the Kuroshio and its recirculation regions south of Japan"Journal of Oceanography. 59巻・3号. 291-301 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] H.Uchida, S.Imawaki: "Eulerian mean surface velocity field derived by combining drifter and satellite altimeter data"Geophysical Research Letters. 30巻・5号. 33-1-33-4 (2003)

    • Related Report
      2003 Annual Research Report

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

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