2011 Fiscal Year Final Research Report
Interannual and decadal variations of shallow meridional overturning cells in the Indian Ocean
| Project/Area Number |
21540450
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | Japan Agency for Marine-Earth Science and Technology (2010-2011)
The University of Tokyo (2009) |
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Principal Investigator |
MASUMOTO Yukio 独立行政法人海洋研究開発機構, 地球環境変動領域, プログラムディレクター (60222436)
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| Project Period (FY) |
2009 – 2011
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| Keywords | インド洋 / 浅い南北循環セル / 十年規模変動 / インドネシア通過流 |
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| Research Abstract |
Decadal variations of shallow meridional overturning cells in the Indian Ocean and their possible mechanisms are investigated using results from a high-resolution ocean general circulation model and a series of sensitivity studies with simplified numerical models. It turns out that the southern tropical cell is divided into two parts. A northern part, north of 10°S, is strongly affected by variations of wind stress curl over the Indian Ocean and weakened(strengthened) during 1990s(2000s). On the other hand, a southern part between 10°S and 30°S strengthened(weakened) during 1990s(2000s). The Indonesian throughflow may be an important factor affecting the variations in the southern part of the southern tropical cell.
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