云微物理方案在高原低涡个例模拟中的应用效果分析

The Effect of Cloud Microphysical Schemes on the Simulation of Plateau Vortex

以一次高原低涡东移造成甘肃河东地区强降水天气过程为例,利用NCEP再分析资料为背景场驱动WRF模式进行了数值模拟,并区分是否使用微物理方案和使用何种方案进行了26组试验,结果表明:本案例中开启微物理方案对高原低涡移动路径和强度的模拟能力均有显著提升;通过对各方案对比分析,在降水量级和落区方面Morrison 2-moment方案、WSM5方案排名靠前,降水时间准确性上Goddar方案、Purdue Lin方案、WSM5方案等较好,综合分析WSM5方案最佳,Kessler方案最差。

Based on one eastward moving of the plateau vortex which resulted in heavy rainfall in Hedong area of Gansu,this paper used the NCEP reanalysis data as the background field and drove WRF mode to make a numerical simulation,and conducted 26 experiments to decide whether to use a microphysics scheme and the type of scheme.The results showed that,opening the microphysical scheme could significantly improve the simulation ability of the movement path and intensity of the plateau vortex.Through the comparative analysis of microphysical schemes,the Morrison 2-moment scheme and WSM5 ranked high in terms of the magnitude of precipitation and rain drop zone.The Goddar scheme,Purdue Lin scheme and WSM5 scheme performed better on the accuracy of precipitation time.Comprehensive analysis showed that the WSM5 solution performed the best in this case while Kessler performed the worst.