平均径向速度场特征为辐合系统和气旋性辐合系统，垂直剖面图上，低层有明显的辐合界面。
The mean meridional speed field are concentrated systems and cyclone concentrated systems, Obvious concentrated interface on low-level on the vertical cross-section.
持续的垂直风向切变及强辐合等风场结构为暴雪产生创造了条件；
The special structure of wind area such as continuous vertical wind direction shear and the strong convergence create the useful situation of the snowstorm.
下面是热带气旋的垂直环流示意图，图中可看到低层的空气辐合及高层的空气辐散。
The convergence of air at the lower levels and divergence aloft imply a vertical circulation which is schematically shown in the following cross-sectional diagram.
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