在垂直螺旋度的基础上，定义了散度通量，水汽垂直螺旋度和水汽散度通量三个宏观物理量。
On the basis of vertical helicity, we define three parameters, namely, the divergence flux, moisture vertical helicity and moisture divergence flux.
大暴雨发生在对流层中低层为气旋性涡旋、流场辐合加强、水汽通量增加、水汽通量辐合加强，并伴有高层较强辐散的情况下。
The heavy rain is presented under the condition of the strong positive vorticity, convergence, vapor flux convergence in middle and lower troposphere and stronger divergence at upper troposphere.
另外，华北地区在1960—1964年垂直积分的水汽输送通量存在最大值，1965年以后水汽输送通量值开始变小，1977年后水汽输送通量值较小且保持稳定。
In addition, there was maximum for the vertical integral of vapor fluxes from 1960 to 1964, which began to decrease from 1965. The vapor flux was less and stable since 1977.
另外，华北地区在1960—1964年垂直积分的水汽输送通量存在最大值，1965年以后水汽输送通量值开始变小，1977年后水汽输送通量值较小且保持稳定。
In addition, there was maximum for the vertical integral of vapor fluxes from 1960 to 1964, which began to decrease from 1965. The vapor flux was less and stable since 1977.
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