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Direct observation of mixing and diffusion in the Southern Ocean

Research Project

Project/Area Number 24540475
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionJapan Agency for Marine-Earth Science and Technology

Principal Investigator

KATSUMATA Katsuro  国立研究開発法人海洋研究開発機構, 地球環境観測研究開発センター, グループリーダー代理 (80450774)

Project Period (FY) 2012-04-01 – 2016-03-31
Project Status Completed (Fiscal Year 2015)
Budget Amount *help
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2014: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2013: ¥130,000 (Direct Cost: ¥100,000、Indirect Cost: ¥30,000)
Fiscal Year 2012: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Keywords南大洋 / 渦 / 渦輸送 / 運動量輸送 / 形状抵抗 / 西岸境界流 / アルゴフロート / 南極中層水 / 鉛直拡散 / 水平拡散 / 南大洋の渦 / 長期変動 / 海洋大循環 / 鉛直混合
Outline of Final Research Achievements

We observed vertical and horizontal mixing and diffusion in the Southern Ocean. Expendable Microstructure Profilers suffered from noise and premature termination possibly due to optical fibre and yielded limited data. Drift and hydrographic data from Argo floats demonstrated spatial distribution of two quantities; horizontal eddy transport in the upper 1000 m and vertical propagation of eastward momentum through the water column carried by eddy topography interaction. For the former, strong poleward transport (spreading of Sub-Antarctic Mode Water and Antarctic Intermediate Water) was found in the South Indian Ocean. For the latter, the momentum transfer is limited to several spots where the Antarctic Circumpolar Current negotiates topographic obstacles despite large spatial scales of momentum input by westerly wind.

Report

(5 results)
  • 2015 Annual Research Report   Final Research Report ( PDF )
  • 2014 Research-status Report
  • 2013 Research-status Report
  • 2012 Research-status Report
  • Research Products

    (6 results)

All 2016 2015 Other

All Presentation (6 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Presentation] アルゴフロートで観測された南大洋の渦2016

    • Author(s)
      勝又勝郎
    • Organizer
      日本地球惑星科学連合 2016 年大会
    • Place of Presentation
      幕張メッセ(千葉県千葉市)
    • Year and Date
      2016-05-24
    • Related Report
      2015 Annual Research Report
  • [Presentation] アルゴフロートで観測された海洋上層 1000 m の渦輸送2016

    • Author(s)
      勝又勝郎
    • Organizer
      日本地球惑星科学連合 2016 年大会
    • Place of Presentation
      幕張メッセ(千葉県千葉市)
    • Year and Date
      2016-05-22
    • Related Report
      2015 Annual Research Report
  • [Presentation] Eddy transport at 1000 m depth estimated by Argo floats2015

    • Author(s)
      Katsuro Katsumata
    • Organizer
      GAIC2015: combined Global Ocean Ship-based Hydrographic Investigations Program/Argo/International Ocean Carbon Coordinate Project Conference on physical and biogeochemical
    • Place of Presentation
      Radisson Hotel, ゴールウェイ(アイルランド)
    • Year and Date
      2015-09-25
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Eddy form stress in the Southern Ocean at 1000 dbar2015

    • Author(s)
      K. Katsumata
    • Organizer
      26th IUGG General Assembly 2015
    • Place of Presentation
      チェコ、プラハ
    • Year and Date
      2015-06-26 – 2015-07-01
    • Related Report
      2014 Research-status Report
  • [Presentation] 南大洋の数年から十年規模の変動2015

    • Author(s)
      勝又勝郎
    • Organizer
      日本地球惑星科学連合 2015 年大会
    • Place of Presentation
      千葉県千葉市幕張メッセ
    • Year and Date
      2015-05-27
    • Related Report
      2014 Research-status Report
    • Invited
  • [Presentation] 南大洋 1000 m 深の渦

    • Author(s)
      勝又勝郎
    • Organizer
      日本海洋学会 2014 年春季大会
    • Place of Presentation
      東京都(東京海洋大学)
    • Related Report
      2013 Research-status Report

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Published: 2013-05-31   Modified: 2019-07-29  

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