2016 Fiscal Year Final Research Report
Study on the Venus atmospheric superrotation with a focus on the thermal tide and mean meridional circulation mechanisms
| Project/Area Number |
25400470
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | Kyoto Sangyo University |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Keywords | 金星大気スーパーローテーション / 熱潮汐波 / 子午面循環 / 惑星大気 |
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| Outline of Final Research Achievements |
We conducted a study on the Venus atmospheric superrotation with a focus on the thermal tide and mean meridional circulation (Gierasch) mechanisms. The results show that both these two mechanisms are essential to the atmospheric superrotation at the cloud levels. We have also succeeded in reproducing the realistic atmospheric structures in the Venus upper atmosphere. It has been found that (1) the active baroclinic instability waves are excited at the lower cloud levels with lower static stability, and the so-called Rossby waves are explained by the baroclinic instability waves; (2) the cold collar, which is a cold latitudinal band surrounding the warm polar vortex at the cloud top levels, are successfully reproduced in the GCM results, and the mean meridional circulation induced by the thermal tide is quite important for the generation of the cold collar.
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| Free Research Field |
惑星気象学
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