Are geostrophic and quasi-geostrophic approximations valid in Venus’ differential super-rotation?
Are geostrophic and quasi-geostrophic approximations valid in Venus’ differential super-rotation?
复制标题
地转和准地转近似在金星的差分超级自转中是否有效？
DOI：
10.1080/03091920600748266
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发表时间：
2006
影响因子：
1.3
通讯作者：
Hiroshi L. Tanaka
中科院分区：
文献类型：
--
作者：
Masaru Yamamoto;Hiroshi L. Tanaka
本文用fA方法研究了金星水平微分超自转的地转动力学（科里奥利参数由惯性系中基本流的角速度定义）和（由角速度的纬度梯度定义的差动旋转参数）在不考虑基本场的垂直切变和内禀相速度的大小与水平涡流地转和准地转近似是有效的弱微分和刚体超旋转的区域，但是，他们是无效的，即使在区域的强微分超旋转的Rossby数RO是足够小的天气涡旋小于1。在类金星大气环流模式中，由于大的Γ/fA（≥1/2），在±60°纬度和60 km高度以下的大范围内，由强差异引起的水平辐散是不可忽略的。
Geostrophic dynamics in the horizontally differential super-rotation of Venus are examined using fA (the Coriolis parameter defined by the angular velocity of a basic flow in an inertial frame) and Γ (the differential rotation parameter defined by the latitudinal gradient of the angular velocity) under the conditions that vertical shear of the basic field is not considered and the intrinsic phase velocity has a magnitude comparable to that of an eddy horizontal flow. The geostrophic and quasi-geostrophic approximations are valid in the regions of weakly differential and rigid-body super-rotations; however, they are invalid in the regions of strongly differential super-rotation even when the Rossby number R O is sufficiently smaller than unity for synoptic eddies. In a general circulation model of a Venus-like atmosphere, the horizontal divergence that results from the strong differential cannot be ignored over a wide range within latitudes ±60° and below 60 km elevation because of large Γ/fA (≥1/2).
影响因子：
5.2
作者：
Masaru Yamamoto;M. Takahashi
通讯作者：
Masaru Yamamoto;M. Takahashi