中文摘要：

用MM5v3模式对江淮暴雨进行了计入与不计入边界层和计入与不计入地面通量的敏感性试验,结果指出二者的影响是一致的,地面通量是边界层影响的主要部分。一般说,不计边界层影响,则湿位涡、水汽通量散度、涡度、低空急流等分布发生变化,其中心位置改变,强度也有改变（大部分减弱）,造成总的降水减弱和降水位置的改变。边界层正是通过湿位涡、水汽通量散度、涡度、低空急流等因素的综合影响来影响暴雨,并影响暴雨的落区和强度。

英文摘要：

A sensitivity experiment has been performed by MM5v3 model both with and without surface fluxes and both with and without boundary layer, the results show that the effects of surface fluxes and boundary layer are similar, the effect of surface fluxes is the main part. Generally speaking, if the effect of PBL is excluded, the distributions of moist-potential vorticity, moist flux divergence, vorticity and low level jet will change, the location of their centers will change, their strengths also will change （u- sually decrease） ,which result in the decrease of precipitation and the change of its location. The boundary layer influences the heavy rain through the total effects of wet potential vorticity, moist flux divergence, vorticity and low level jet, affects the area and intensity of heavy rain.