The result indicates: initial CCN has great influence on convectional precipitation.

模拟结果表明：初始ccn对对流性降水影响较大。

Therefore, the central difference to deal with both the convectional and the diffusion term was adopted.

针对反向计算的如上特点，我们对对流项和扩散项均采取了中心差分的处理方式。

The analysis of the virtual echo such as three -body scatter spike echo, the secondary echo, the side -lobe echo is given echo based on observational re cords of severe convectional weather in 2003.

根据2003年几次强对流天气的观测资料，对其中三体散射长钉、二次回波旁瓣回波等虚假回波进行了分析。