Direct observation of mixing and diffusion in the Southern Ocean
Project/Area Number |
24540475
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Meteorology/Physical oceanography/Hydrology
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Research Institution | Japan 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)
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Project Period (FY) |
2012-04-01 – 2016-03-31
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Project Status |
Completed (Fiscal Year 2015)
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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)
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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.
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Report
(5 results)
Research Products
(6 results)
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[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
Int'l Joint Research
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