| Project/Area Number |
20740273
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | Kyushu University |
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Principal Investigator |
YAMAMOTO Masaru Kyushu University, 応用力学研究所, 准教授 (10314551)
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| Project Period (FY) |
2008 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
|
| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2010: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2009: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2008: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Keywords | 惑星大気 / 大気大循環 / 大気波動 / 地球流体力学 |
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| Research Abstract |
An unified theory of planetary atmospheric circulation, which can be applied for wide ranges of physical parameters, is required to study atmospheric dynamics of extrasolar terrestrial planets. The present work elucidates sensitivities of cloud-covered middle-atmospheric general circulation to astronomical parameters. As tilt of the planetary rotation axis is increased, superrotational flow (prograde atmospheric rotation) becomes weaker. For more than 60Ω, subrotational flow (retrograde atmospheric rotation) is formed. In slowly rotating planets, the retrograde rotation rate is limited to -Ω (where Ω is the planetary rotation rate). In addition, the present work elucidates sensitivity of the superrotation to diabatic heating rate below the cloud layer. Small changes in the weak lower-atmospheric heating lead to drastic changes of the middle-atmospheric superrotation.
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