Dynamics of Venus' superrotation: The eddy momentum transport processes newly found in a GCM
Dynamics of Venus' superrotation: The eddy momentum transport processes newly found in a GCM
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DOI：
10.1029/2004gl019518
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发表时间：
2004-05
影响因子：
5.2
通讯作者：
Masaru Yamamoto;M. Takahashi
中科院分区：
文献类型：
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作者：
Masaru Yamamoto;M. Takahashi
在金星大气层中观测到4天的超自转，比行星自转（243天）快60倍。虽然在GCM中很难再现这种异常现象，但在我们改进的GCM中，超旋转被相速度低于50 m s−1的纬向环流和行星尺度波再现。热致波在中层大气中产生向赤道方向的动量通量，而行星尺度的两种不同的重力波和Rossby波在低层大气中产生向赤道方向的动量通量。这些过程在模拟金星超自转的动力学中起着至关重要的作用。
A 4‐day superrotation 60‐times faster than the planetary rotation (243 days) is observed in Venus' atmosphere. Although it has been difficult to reproduce the extraordinary phenomenon in GCMs, the superrotation is reproduced by meridional circulation and planetary‐scale waves with phase velocities slower than 50 m s−1 in our improved GCM. Thermally induced waves produce equatorward momentum fluxes in the middle atmosphere, while the planetary‐scale pattern of two different gravity and Rossby waves with the same frequency is found to produce the equatorward momentum flux in the lower atmosphere. These processes play crucial roles in dynamics of the simulated Venus superrotation.