Superrotation Maintained by Meridional Circulation and Waves in a Venus-Like AGCM
Superrotation Maintained by Meridional Circulation and Waves in a Venus-Like AGCM
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DOI：
10.1175/jas3859.1
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发表时间：
2006-12
影响因子：
3.1
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
摘要利用类金星大气环流模式（AGCM）模拟了一个比行星自转快60倍（243天）的完全发展的超自转。超旋转的角动量在波的帮助下被纬向环流泵出，这加速了赤道纬向流。太阳加热和剪切不稳定性产生的波在金星超旋转的大气动力学中起着至关重要的作用。热潮汐的垂直和水平动量输送维持了中层大气的赤道超旋，而切变不稳定性引起的向赤道涡动动量通量提高了低层大气纬向环流向上角动量输送的效率。除了超旋转外，模拟的云层中的一些波与观测结果是一致的。行星尺度的Kelvin波被确认为周期为5-6天的近红外（NIR）振荡，是由切变不稳定性产生的。
Abstract Fully developed superrotation—60 times faster than the planetary rotation (243 days)—is simulated using a Venus-like atmospheric general circulation model (AGCM). The angular momentum of the superrotation is pumped up by the meridional circulation with the help of waves, which accelerate the equatorial zonal flow. The waves generated by solar heating and shear instability play a crucial role in the atmospheric dynamics of the Venusian superrotation. Vertical and horizontal momentum transports of thermal tides maintain the equatorial superrotation in the middle atmosphere, while equatorward eddy momentum flux due to shear instability raises the efficiency of upward angular momentum transport by the meridional circulation in the lower atmosphere. In addition to the superrotation, some waves simulated in the cloud layer are consistent with the observations. The planetary-scale Kelvin wave identified as the near-infrared (NIR) oscillation with periods of 5–6 days is generated by the shear instability...