利用WRF模式(V3.6),采用WDM6双参数微物理方案对2012年7月2～3日江淮地区的一次持续性梅雨锋暴雨过程进行数值模拟,对不同初始云凝结核(CCN)浓度背景下的地面累积降水量和云中微物理过程进行对比分析.结果表明,初始CCN浓度在一定程度上影响了降水的微物理过程,进而影响降水量;当背景CCN浓度增加时,在降水前期引起云滴半径减小,云滴转化效率变低,抑制暖云降水,后期冷云过程得到加强,大量冰相粒子生成,最终导致降水增加.%By using the WDM6 two-moment microphysics scheme of WRF v3.6 (Weather Research & Forecasting version 3.6),the continuous Meiyu front rainfall event during July 2-3 in 2012 in Jianghuai Region was simulated.The surface accumulated precipitations and the cloud mi crophysics processes under different initial CCN concentration were analyzed.The results showed that the initial CCN concentration to some extent impacts on the processes of precipitation,thus further influences the amount of precipitation.When increasing background CCN concentration,in earlier stage of precipitations the radius of cloud droplet and its conversion efficiency decrease,inhibiting the precipitations from warm clouds,while in the later stage the processes of cold clouds are enhanced,forming a large number of ice particles and thus leading to the increasing rain falls.
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