云微物理方案在高原低涡个例模拟中的应用效果分析

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-mom...

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

The large-scale heavy precipitation caused by the eastward shift of the Tibetan plateau vortex is a common weather process in the plateau downstream area in summer. This article takes a plateau vortex that moves out of the plateau and passes through the east of Gansu Hedong as an example, and uses the NCEP reanalysis data as the background field to drive the WRF mode. And by distinguishing whether to use a microphysics scheme, or which microphysics scheme to use, a total of 26 experiments were performed. The results show that the accuracy of precipitation and precipitation distribution is not significantly improved by using microphysical scheme, but it can significantly improve the consistency of rainfall intensity with the actual situation in time dimension, and improved the ability to simulate the movement path and intensity of the plateau low vortex; For the case where the microphysics scheme is used, the Morrison 2-moment scheme and WSM5 rank high in terms of the magnitude of precipitation and the area of fall. The Goddar scheme, Morrison with aerosol scheme, and WSM5 scheme perform better on the accuracy of precipitation time. Comprehensive analysis shows that the WSM5 solution performs best in this example, and Kessler performs worst.