| Project/Area Number |
24740320
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | Nagoya University |
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Principal Investigator |
FUJINAMI Hatsuki 名古屋大学, 地球水循環研究センター, 助教 (60402559)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | モンスーン / 降水 / 雲 / 季節内変動 / 地形性降水 / マルチスケール / 南アジア / 降水量 / 季節内振動 / 地形性降雨 / アジアモンスーン / バングラデシュ / インド / ミャンマー |
|---|
| Research Abstract |
The rainfall distribution and rainfall amount, related to the distinct quasi-biweekly oscillation around Bangladesh, are highly controlled by regional-scale topography located on the easternmost part of the Gangetic Plain. Strong westerly/southwesterly flow along the plain enhances the orographic rainfall in the windward area of the mountains. A region away from mountainous area also gets high rainfall due to the low-level convergence, associated with a closed low of the horizontal scale of ~600 km. The n=1 equatorial Rossby wave is a key agent that regulates the low-level zonal wind along the plain to the south of the Tibetan Plateau (TP) and controls the periodicity. The mid-latitude atmospheric circulation around the TP also play an active role in enhancing the zonal wind fluctuation along the plain. Thus, multi-scale interaction is obvious between topography, precipitation system and atmospheric circulation, resulting in the distinct intraseasonal oscillation around South Asia.
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