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2012 Fiscal Year Final Research Report

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

Research Project

  • PDF
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
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.

  • Research Products

    (10 results)

All 2013 2012 2011 2010 Other

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (8 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

    • 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

    • 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
  • [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
  • [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
  • [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
  • [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
    • Year and Date
      20110300
  • [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
  • [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
  • [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

URL: 

Published: 2014-08-29  

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