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首页> 外文期刊>Pure and Applied Geophysics >Numerical Study on Vortices in the Middle Layer of Flow around a Large Mountain under Rotating Stratified Conditions
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Numerical Study on Vortices in the Middle Layer of Flow around a Large Mountain under Rotating Stratified Conditions

机译：旋转分层条件下大山绕流中层涡旋的数值研究

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Generation of cyclonic vortices in the middle layer of flow around a large mountain like Tibet and Rocky was investigated by means of a 3-D nonhydrostatic meteorological prognostic model. Special attention was paid to the effects of the earth’s rotation and stratification on the vortices detached successively from the slope of a high and large horizontal scale mountain. It was found the successive formation and detachment of such ‘von Karman-like vortices’ occurred in the flow regime at high Rossby numbers Ro and low Froude numbers Fr. It was successfully divided by the criterion of baroclinic instability. This means that if the condition is unstable baroclinically, a lee vortex is destabilized into a three-dimensional one, while under baroclinically stable conditions the lee vortex with vertical axis retains its standing structure and remains long lasting in the middle layer.
机译：利用3-D非静水气象预报模型，研究了围绕西藏和洛矶山脉这样的大山中流的中间层气旋涡的产生。特别注意地球自转和分层对从高大和大尺度山峰的山坡上依次分离出的涡旋的影响。人们发现，这种“冯·卡门式涡旋”的形成和分离是在高罗斯比数Ro和低弗洛德数Fr的流动状态下发生的。它已成功地通过斜压不稳定标准进行了划分。这意味着，如果条件在斜压下不稳定，则回风涡旋将被稳定为一个三维涡旋，而在斜压下稳定的条件下，具有垂直轴的回旋涡将保持其直立结构，并在中间层中持续较长时间。

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