2015 Fiscal Year Final Research Report
Direct observation of mixing and diffusion in the Southern Ocean
Project/Area Number |
24540475
|
Research Category |
Grant-in-Aid for Scientific Research (C)
|
Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Meteorology/Physical oceanography/Hydrology
|
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)
|
Project Period (FY) |
2012-04-01 – 2016-03-31
|
Keywords | 南大洋 / 渦 |
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.
|
Free Research Field |
海洋物理学
|