单双参云微物理方案对华北“7·20”特大暴雨数值模拟对比分析

Comparative Analysis of Single-Moment and Double-Moment Microphysics Schemes in WRF on the Torrential Rainfall Event in North China During 19-21 July,2016

在2016年7月19 21日华北特大暴雨过程初步分析的基础上,采用中尺度数值模式WRF3.6.1中16种微物理参数化方案对该过程进行了数值模拟,并分为单参和双参两组对结果进行评估分析。结果表明,该过程为伴随低涡发展的强对流降水,持续时间长、范围广、总量大。大部分微物理方案对降水的分布模拟效果较好,能够再现此次特大暴雨过程;随模拟时间延长,方案间的差别变大,且单参方案对各量级降水的模拟差别比双参方案显著,方案间雨水混合比、固态水凝物以及垂直速度的差别均大于双参方案,整体效果不如双参方案。综合来看,SBU_YLin方案对于此次特大暴雨过程模拟效果最好,对降水量级和落区的模拟都接近实况。

Based on a general analysis, the torrential rainfall event in north China during 19 --21 July 2016 is simulated by using the Weather Research Forecast modeling system. The effects of microphysics schemes, divided into two groups of nine single and seven double-moment schemes on rainfall area and intensity of precipitation were evaluated. The results show that the heavy rainfall event with low vortex characterized by high intensity, long duration and large amount. Simulation of most schemes present a rather good reproduction of rainfall. As time goes on , differenc-es between schemes are more obvious. The results of the double-moment schemes pres- ented less simulation effect, compared to the results of the single-moment schemes in terms of rain mixing ratio, solid hydrometeor and vertical velocity. The double-moment schemes was much better than its contrary one. Overall, it was the SBU_YLin that provided the most successful simulation scheme on the torrential, and the simulation of rainfall area and intensity of the rainfall was close to the observations.