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Fundamental research on the western boundary current induced by Rossby waves

Research Project

Project/Area Number 16540401
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

WAKATA Yoshinobu  Kyushu University, Research Institute for Applied Mechanics, Professor, 応用力学研究所, 教授 (90201871)

Co-Investigator(Kenkyū-buntansha) IGA Keita  University of Tokyo, Ocean Research Institute, Associate Professor, 海洋研究所, 助教授 (60292059)
Project Period (FY) 2004 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2006: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2005: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2004: ¥2,000,000 (Direct Cost: ¥2,000,000)
KeywordsKuroshio volume transport / Rossby wave / TOPEX / POSEIDON / Equatorial wave / East China Sea / 人工衛星海面高度 / 黒潮 / 海洋大循環モデル / 経年変動 / 黒潮前線波動 / 数十年変動
Research Abstract

We investigate the interannual variability of Kuroshio volume transport using Ocean General Circulation Model and satellite altimeter data. It was found from the analysis in the middle latitude area that the Kuroshio volume transport can be understood from the propagation response of the baroclinic Rossby waves to the sea surface wind stress. However, this explanation was inapplicable in the area existing subtropical countercurrent owing to the effect of unstable waves.
The headstream of Kuroshio Current continues to the north equatorial current in the area of which it was known that there are many equatorial waves such as Rossby wave and Kelvin wave. These waves may influence this headstream. The sea surface height (SSH) anomaly was separated into equatorial modes using satellite altimeter data. The power-spectral density (PSD) was obtained for the east-west wavenumber and frequency for each separated mode. The PSD distribution was compared with the theoretical dispersion curve for the … More equatorial modes derived by Matsuno (1966). The first Rossby modes have a high-density distribution that is slightly lower than the theoretical dispersion curve, but the Kelvin mode and the higher Rossby modes have high-density distribution that almost matches each dispersion curve. Results of analyses of satellite observational data show that wave motion near the equator mainly shows characteristics of equatorial waves, especially for a intraseasonal time scale.
Seasonal variability of SSH in the East China Sea and the Yellow Sea was investigated through the study of model simulation and analysis of observed data. The model SSH was compared with the tide-gage data. The model SSH is also compared with the satellite altimeter data using Harmonic analysis, and they generally showed good agreement in wide area. The SSH is high in summer and low in winter. As a factor of this seasonal variability, SSH variability due to the thermal expansion was considered. The minimum appears in February and the maximum appears in September. However, the fluctuation range of model and altimeter data is about twice of this thermal expansion effect, and the time when the minimum appears is locally different. The dynamical effect due to the wind stress must be important. Winter monsoon burst extrudes the seawater from the northern marginal sea area. This may enhance the amplitude and advance the phase in this area. Less

Report

(4 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • 2004 Annual Research Report
  • Research Products

    (28 results)

All 2007 2006 2005 2004 Other

All Journal Article (28 results)

  • [Journal Article] Frequency-wavenumber spectra of equatorial waves detected from satellite altimeter data2007

    • Author(s)
      Y.Wakata
    • Journal Title

      Journal of Oceanography 63

      Pages: 483-490

    • NAID

      10019934592

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] Convection driven by collective buoyancy of microbubbles2007

    • Author(s)
      K.Iga, R.Kimura
    • Journal Title

      Fluid Dynamics Research 39

      Pages: 68-97

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Frequency-wavenumber spectra of equatorial waves detected from satellite altimeter data.2007

    • Author(s)
      Y.Wakata
    • Journal Title

      Journal of Oceanography 63

      Pages: 483-490

    • NAID

      10019934592

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Convection driven by collective buoyancy of microbubbles.2007

    • Author(s)
      K.Iga, R.Kimura
    • Journal Title

      Fluid Dynamics Research 39

      Pages: 68-97

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Convection driven by collective buoyancy of micro bubbles2007

    • Author(s)
      K.Iga, R.Kimura
    • Journal Title

      Fluid Dyn. Res. 39

      Pages: 68-97

    • Related Report
      2006 Annual Research Report
  • [Journal Article] 衛星海面高度計データより求めた赤道波の振動数波数スぺクトル2006

    • Author(s)
      和方吉信
    • Journal Title

      地球流体力学研究集会講究録 17ME-S4

      Pages: 74-88

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Interannual variability of the Kuroshio transport passing through the 137° E meridian in an OGCM related to the North Pacific windstress2006

    • Author(s)
      Y.Wakata, T.Setou, I.Kaneko, H.Uchida, S.Imawaki
    • Journal Title

      Journal of Oceanography 62

      Pages: 25-35

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 東シナ海と黄海における海面高度の季節変動に関する研究2006

    • Author(s)
      Y.Wakata
    • Journal Title

      海洋理工学会 12

      Pages: 43-51

    • NAID

      10018709638

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Spectra of equatorial waves detected from satellite altimeter data.2006

    • Author(s)
      Y.Wakata
    • Journal Title

      Reports on Geophysical Fluid dynamics 17ME-S4

      Pages: 74-88

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Interannual variability of the Kuroshio transport passing through the 137°E meridian in an OGCM related to the North Pacific windstress.2006

    • Author(s)
      Y.Wakata, T.Setou, I.Kaneko, H.Uchida, S.Imawaki
    • Journal Title

      Journal of Oceanography 62

      Pages: 25-35

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 東シナ海と黄海における海面高度の季節変動に関する研究2006

    • Author(s)
      和方吉信
    • Journal Title

      海洋理工学会誌 12

      Pages: 43-51

    • NAID

      10018709638

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Upper-tropospheric vortex street and its formation mechanism2006

    • Author(s)
      Y.Maejima, K.Iga, H.Niino
    • Journal Title

      SOLA doi:10.2151

      Pages: 80-83

    • NAID

      130004448407

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Interannual variability of the Kuroshio transport passing through the 137°E meridian in an OGCM related to the North Pacific windstress2006

    • Author(s)
      Y.Wakata, T.Setou, I.Kaneko, H.Uchida, S.Imawaki
    • Journal Title

      Journal of Oceanography 62

      Pages: 25-35

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 冬季日本海西部海上に現れる帯状収束雲の形成-帯状収束雲に見られる前線状構造についての数値実験-2005

    • Author(s)
      池田倫子, 伊賀啓太
    • Journal Title

      九州大学大学院総合理工学報告 27(2)

      Pages: 251-256

    • NAID

      120001280742

    • Related Report
      2005 Annual Research Report
  • [Journal Article] ジェットと高低気圧・前線の力学-2004年度秋季大会シンポジウム「極東域の温帯低気圧」の報告-2005

    • Author(s)
      伊賀啓太
    • Journal Title

      天気 52(10)

      Pages: 735-741

    • NAID

      110002535447

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 水路モデルのジェットの変動によるカオス的混合2004

    • Author(s)
      永野宏樹, 伊賀啓太
    • Journal Title

      九州大学大学院総合理工学報告 27

      Pages: 251-256

    • NAID

      110000963684

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 日本南岸の黒潮流量の2年予測2004

    • Author(s)
      田中潔, 池田元美, 瀬藤聡, 和方吉信
    • Journal Title

      月刊海洋 34

      Pages: 211-221

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 準地衡流乱流におけるエンストロフィー時間変化2004

    • Author(s)
      伊賀啓太
    • Journal Title

      九州大学大学院総合理工学報告 26

      Pages: 23-26

    • NAID

      110000953470

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] ジェットの不安定から生じる渦列の統計理論2004

    • Author(s)
      伊賀啓太
    • Journal Title

      月刊海洋 38

      Pages: 23-27

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary 2004 Annual Research Report
  • [Journal Article] Chaotic mixing by fluctuation of a jet in a channel model.2004

    • Author(s)
      H.Nagano, K.Iga
    • Journal Title

      Engineering sciences reports, Kyushu University 27

      Pages: 251-256

    • NAID

      110000963684

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Two years prediction of Kuroshio volume transport.2004

    • Author(s)
      K.Tanaka, M.Ikeda, S.Setou, Y.Wakata
    • Journal Title

      Kaiyo Monthly 34

      Pages: 211-221

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Time Evolution of Enstrophy in Quasi-Geostrophic Turbulence2004

    • Author(s)
      K.Iga
    • Journal Title

      Engineering sciences reports, Kyushu University 26

      Pages: 23-26

    • NAID

      110000953470

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Statistical theory of vortex street emitted from unstable jets.2004

    • Author(s)
      K.Iga
    • Journal Title

      Kaiyo Monthly 38

      Pages: 23-27

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 日本南岸および東シナ海における黒潮流量の経年変化2004

    • Author(s)
      和方吉信
    • Journal Title

      月刊海洋 37

      Pages: 56-82

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 日本南岸の黒潮流量の2年予測2004

    • Author(s)
      田中潔
    • Journal Title

      月刊海洋 37

      Pages: 211-221

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 地衡流乱流におけるエンストロフィー時間変化2004

    • Author(s)
      伊賀啓太
    • Journal Title

      九大総理工報告 26・1

      Pages: 23-26

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 水路モデルのジェットの変動によるカオス的混合2004

    • Author(s)
      水野宏樹
    • Journal Title

      九大総理工報告 26・2

      Pages: 219-223

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Seasonal variability of sea surface height in the East China Sea and the Yellow sea.

    • Author(s)
      Y.Wakata
    • Journal Title

      Journal of Advanced Marine Science and Technology Society 12

      Pages: 43-51

    • NAID

      10018709638

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary

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Published: 2004-04-01   Modified: 2016-04-21  

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