On the evolution of thunderstorm rotation
On the evolution of thunderstorm rotation
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雷暴旋转的演变
DOI：
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
R. Rotunno
中科院分区：
文献类型：
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作者：
R. Rotunno
摘要选择了垂直速度场，该速度模仿云开发的初始阶段，以数值为单位，由Wilhelmson和Klemp（1978年）。 （z = h/2），解决方案表示a的发展然后将涡流分成两个涡流对向左风的右侧移动，另一个向左移动（在数值模型中观察到）。在中层时，最大涡度随着时间的时间迁移最大垂直速度的位置...
Abstract A vertical velocity field is chosen which imitates that of the initial stages of cloud development as simulated numerically by Wilhelmson and Klemp (1978). Given this, an approximate version of the equation for the vertical component of the vorticity is solved. The vertical velocity is assumed to vary with height as sin πz/H where a is the altitude and H is the depth of the domain. At the level of nondivergence (z=H/2), the solutions indicate the development of a vortex pair which then splits into two vortex pairs one moving to the right of the mean wind and the other to the left (as observed in the numerical model). At lower levels, owing to the convergence in the updraft and divergence in the downdraft, the cyclonic/anticyclonic member of the vortex pair in the rightward/leftward moving storm is greatly enhanced. The vorticity maximum is initially on the maximum gradient of vertical velocity. At mid-levels the maximum vorticity migrates with time close to the position of maximum vertical veloci...