Effects of gravity waves on the day-night difference of the general circulation in the Venusian lower thermosphere
Effects of gravity waves on the day-night difference of the general circulation in the Venusian lower thermosphere
复制标题
DOI：
10.1002/jgre.20154
复制
发表时间：
2013-10-01
影响因子：
4.8
通讯作者：
Kasaba, Y.
中科院分区：
文献类型：
--
作者：
Hoshino, N.;Fujiwara, H.;Kasaba, Y.
我们调查的本地时间变化的风在金星中层和热层，这已建议从最近的地面CO毫米/亚毫米和CO2 10米的观测，使用我们的大气环流模式的机制。我们的模型考虑了由重力波引起的动量输运，重力波参数化由Medvedev和Klaassen（2000）开发。结果表明，大气环流从昼侧到夜侧有明显的变化。日面的亚太阳风-反太阳风（SSAS）占主导地位。另一方面，逆行的超旋转纬向风（RSZ）叠加在SSAS风的夜侧。这些特征与以前的观察结果一致。在110 km高度的夜面驱动RSZ风的向西动量由115-130 km高度区域的重力波提供。源自SSAS风的向下气流将向西的动量在夜面向下输送。
We investigated generation mechanisms of the local time variation of the wind velocity in the Venusian mesosphere and thermosphere, which has been suggested from recent ground-based CO millimeter/submillimeter and CO2 10 m observations, using our general circulation model. Our model considers the momentum transport caused by gravity waves with the gravity wave parameterization developed by Medvedev and Klaassen (2000). Our results show that atmospheric circulation distinctly changes from the dayside to the nightside. The subsolar-to-antisolar (SSAS) wind is predominant in the dayside. On the other hand, the retrograde superrotating zonal (RSZ) wind is superposed on the SSAS wind in the nightside. These characteristics are consistent with the previous observations. The westward momentum, which drives the RSZ wind in the nightside at an altitude of 110 km, is supplied by gravity waves in the 115-130 km altitude region. The downward flow that originates in the SSAS wind transports the westward momentum downward in the nightside.