Stationary waves and slowly moving features in the night upper clouds of Venus
Stationary waves and slowly moving features in the night upper clouds of Venus
复制标题
金星夜间上层云层中的静止波和缓慢移动的特征
DOI：
10.1038/s41550-017-0187
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发表时间：
2017
期刊：
影响因子：
14.1
通讯作者：
T.
中科院分区：
文献类型：
--
作者：
Peralta;J.;Hueso;R.;Sanchez-Lavega;A.;Lee;Y.J.;Garcia-Munoz;A.;Kouyama;T.;Sagawa;H.;Sato;T.M.;Piccioni;G.;Tellmann;S.;Imamura;T.;Satoh;T.
在金星的云顶水平（65-70公里高度），大气的旋转速度比下面的表面快60倍，这种现象被称为超旋转。而在金星的阳面，云顶的运动是很好的确定，，和金星大气环流模型预测的平均纬向流在上层云是类似的白天和黑夜，黑夜环流仍然很少研究，除了极地地区，。在这里，我们报告全球测量的夜面环流在上层云。我们跟踪了2006年至2008年间由金星快车上的可见光和红外热成像光谱仪-成像仪获得的3.8和5.0 μm热发射图像中的各个特征，以及2015年由美国国家航空航天局红外望远镜设施的中分辨率0.8-5.5微米光谱仪和成像仪进行的地面测量。纬向运动的范围为-110到-60 m s-1，这与向阳面的观测结果一致，但色散更大。慢运动（−50至−20 m s-1）也被发现，但仍无法解释。此外，丰富的定常波模式（纬向速度为−10至+10 m s-1）主导了夜间的上层云层，并集中在地表海拔较高的区域。
At the cloud top level of Venus (65–70 km altitude) the atmosphere rotates 60 times faster than the underlying surface—a phenomenon known as superrotation,. Whereas on Venus’s dayside the cloud top motions are well determined,,,and Venus general circulation models predict the mean zonal flow at the upper clouds to be similar on both the day and nightside, the nightside circulation remains poorly studied except for the polar region,. Here, we report global measurements of the nightside circulation at the upper cloud level. We tracked individual features in thermal emission images at 3.8 and 5.0 μm obtained between 2006 and 2008 by the Visible and Infrared Thermal Imaging Spectrometer-Mapper onboard Venus Express and in 2015 by ground-based measurements with the Medium-Resolution 0.8–5.5 Micron Spectrograph and Imager at the National Aeronautics and Space Administration Infrared Telescope Facility. The zonal motions range from −110 to −60 m s–1, which is consistent with those found for the dayside but with larger dispersion. Slow motions (−50 to −20 m s–1) were also found and remain unexplained. In addition, abundant stationary wave patterns with zonal speeds from −10 to +10 m s–1dominate the night upper clouds and concentrate over the regions of higher surface elevation.