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Study on the premature separation of western boundary current and formation of eastward jet

Research Project

Project/Area Number 21540447
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

KUBOKAWA Atsushi  北海道大学, 大学院・地球環境科学研究院, 教授 (00178039)

Co-Investigator(Kenkyū-buntansha) MIZUTA Genta  北海道大学, 大学院・地球環境科学研究院, 助教 (30301948)
Project Period (FY) 2009 – 2012
Project Status Completed (Fiscal Year 2012)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2012: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2011: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2010: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2009: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords海洋循環 / 西岸境界流 / 離岸 / 東向ジェット
Research Abstract

Numerical experiments using a 2-layer quasi-geostrophic mode and a primitive equation model were carried out to study the dynamics of oceanic western boundary current separation and formation of the eastward extension jet. There are two types of stable solutions; one of them is the solution in which the eastward jet is formed along the subtropical/subpolar gyre boundary and the other is the prematurely separated jet solution in which the western boundary current separation occurs far upstream of the gyre boundary. It was found that the latitude of the prematurely separated jet was almost independent of model parameters including nonlinearity. Dependence of the jet latitude on the meridional distribution of the wind forcing was investigated and the mechanism determining the jet latitude was discussed.

Report

(5 results)
  • 2012 Annual Research Report   Final Research Report ( PDF )
  • 2011 Annual Research Report
  • 2010 Annual Research Report
  • 2009 Annual Research Report
  • Research Products

    (19 results)

All 2013 2012 2011 2010 Other

All Journal Article (3 results) (of which Peer Reviewed: 3 results) Presentation (16 results)

  • [Journal Article] Role of the Rossby waves in the Broadening of an Eastward Jet2012

    • Author(s)
      Mizuta, G
    • Journal Title

      Journal of Physical Oceanography

      Volume: Vol. 42 Pages: 476-494

    • NAID

      120004608961

    • Related Report
      2012 Final Research Report
    • Peer Reviewed
  • [Journal Article] Role of the Rossby waves in the Broadening of an Eastward Jet2012

    • Author(s)
      Mizuta, G.
    • Journal Title

      Journal of Physical Oceanography

      Volume: 42 Issue: 3 Pages: 476-494

    • DOI

      10.1175/jpo-d-11-070.1

    • NAID

      120004608961

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 沿岸・陸棚スケールと大洋スケールの海洋前線の違い

    • Author(s)
      久保川厚
    • Journal Title

      沿岸海洋研究

      Volume: 50巻 Pages: 87-94

    • NAID

      130007797380

    • Related Report
      2012 Annual Research Report 2012 Final Research Report
    • Peer Reviewed
  • [Presentation] 表層に振動を与えた場合の波による深層平均流形成2013

    • Author(s)
      水田元太、増田章
    • Organizer
      2013年度日本海洋学会春季大会
    • Place of Presentation
      東京海洋大学品川キャンパス(東京都)
    • Year and Date
      2013-03-24
    • Related Report
      2012 Final Research Report
  • [Presentation] 西岸境界流の東向き続流ジェットの緯度について(続)2013

    • Author(s)
      陶泰典・久保川厚
    • Organizer
      2013 年度日本海洋学会春季大会
    • Place of Presentation
      東京海洋大学品川キャンパス(東京都)
    • Year and Date
      2013-03-22
    • Related Report
      2012 Final Research Report
  • [Presentation] 沿岸・陸棚スケールと大洋スケールの海洋前線の違い2012

    • Author(s)
      久保川厚
    • Organizer
      2012年度日本海洋学会春季大会沿岸海洋シンポジウム
    • Place of Presentation
      筑波大学(つくば市)
    • Year and Date
      2012-03-26
    • Related Report
      2012 Final Research Report
  • [Presentation] 沿岸・陸棚スケールと大洋スケールの海洋前線の違い2012

    • Author(s)
      久保川厚
    • Organizer
      日本海洋学会春季大会シンポジウム
    • Place of Presentation
      筑波大学(つくば市)
    • Year and Date
      2012-03-26
    • Related Report
      2011 Annual Research Report
  • [Presentation] Latitude of eastward jet prematurely separated from the western boundary in a two-layer QG model2012

    • Author(s)
      Sue, Y. and Kubokawa, A
    • Organizer
      2012AGU Ocean Science Meeting, Salt Palace Convention Center
    • Place of Presentation
      Utah, USA
    • Year and Date
      2012-02-20
    • Related Report
      2012 Final Research Report
  • [Presentation] Latitude of eastward jet prematurely separated from the western boundary in a two-layer QG model2012

    • Author(s)
      Sue, Y., Kubokawa, A.
    • Organizer
      2012 AGU Ocean Science Meeting
    • Place of Presentation
      Salt Palace Convention Centet (USA)
    • Year and Date
      2012-02-20
    • Related Report
      2011 Annual Research Report
  • [Presentation] 西岸境界流の東向き続流ジェットの緯度について2011

    • Author(s)
      陶泰典・久保川厚
    • Organizer
      2011年度日本海洋学会秋季大会
    • Place of Presentation
      九州大学筑紫キャンパス(春日市)
    • Year and Date
      2011-09-29
    • Related Report
      2012 Final Research Report
  • [Presentation] 西岸境界流の東向き続流ジェットの緯度について2011

    • Author(s)
      陶泰典・久保川厚
    • Organizer
      日本海洋学会秋季大会
    • Place of Presentation
      九州大学(春日市)
    • Year and Date
      2011-09-29
    • Related Report
      2011 Annual Research Report
  • [Presentation] IDO-CF法の準地衡流モデルへの適用-高精度モデルにおける西岸境界流の離岸2011

    • Author(s)
      陶泰典・久保川厚
    • Organizer
      2011年度日本海洋学会春季大会
    • Related Report
      2012 Final Research Report 2010 Annual Research Report
  • [Presentation] 再循環を伴う東向きジェットの西岸域からの侵入2010

    • Author(s)
      久保川厚
    • Organizer
      2010年度日本海洋学会秋季大会
    • Place of Presentation
      東京農業大学オホーツクキャンパス(網走市)
    • Year and Date
      2010-09-08
    • Related Report
      2012 Final Research Report
  • [Presentation] 再循環を伴う東向きジェットの西岸域からの侵入2010

    • Author(s)
      久保川厚
    • Organizer
      2010年度日本海洋学会秋季大会
    • Place of Presentation
      東京農業大学(北海道、網走市)
    • Year and Date
      2010-09-08
    • Related Report
      2010 Annual Research Report
  • [Presentation] Radiation processes of the Rossby waves from a recirculation gyre and their effects on mean flows2010

    • Author(s)
      Mizuta, G
    • Organizer
      European Geosciences Union, General Assembly 2010
    • Place of Presentation
      Austria Center Vienna, Austria
    • Year and Date
      2010-05-04
    • Related Report
      2012 Final Research Report
  • [Presentation] Radiation processes of the Rossby waves from a recirculation gyre and their effects on mean flows2010

    • Author(s)
      水田元太
    • Organizer
      European Geosciences Union General Assembly 2010
    • Place of Presentation
      Austria Center Vienna
    • Year and Date
      2010-05-04
    • Related Report
      2010 Annual Research Report
  • [Presentation] 2.5層通気水温躍層の周期的風応力強制への応答

    • Author(s)
      久保川厚
    • Organizer
      2012年度日本海洋学会秋季大会
    • Place of Presentation
      静岡市 東海大学
    • Related Report
      2012 Annual Research Report
  • [Presentation] 西岸境界流の東向き続流ジェットの緯度について

    • Author(s)
      陶泰典、久保川厚
    • Organizer
      2013年度日本海洋学会春季大会
    • Place of Presentation
      東京都 東京海洋大学
    • Related Report
      2012 Annual Research Report
  • [Presentation] 表層に振動を与えた場合の波による深層平均流形成

    • Author(s)
      水田元太、増田章
    • Organizer
      2013年度日本海洋学会春季大会
    • Place of Presentation
      東京都 東京海洋大学
    • Related Report
      2012 Annual Research Report

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Published: 2009-04-01   Modified: 2019-07-29  

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