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大气科学  2006 

大气涡旋的螺旋结构

DOI: 10.3878/j.issn.1006-9895.2006.05.13

Keywords: 大气涡旋,螺旋结构,速度场分解

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Abstract:

利用速度场的分解,说明大气中常见的斑图.速度场可分为变形场和旋转场.若大气动力学方程中只有气压梯度力和科里奥利力平衡,此时速度场只有旋转场,地面天气图上气旋反气旋斑图是闭合的.若再加上摩擦力,则斑图为实际的气旋反气旋螺旋.对三维有水平辐散辐合的涡旋,其斑图为三维螺旋型式,常见是漏斗状.台风小口朝上,龙卷风大口朝上.

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