Based on Weather Research and Forecast system mesoscale model (WRF V3.7.1 version), a case of Southwest vortex (SWV) rainstorm process during August 16-19, 2015 was simulated with six different Planetary Boundary Layer (PBL) parameterization schemes (YSU, MYJ, ACM2, MYNN2.5, BouLac, QNSE), and the effects of different PBL schemes on the characteristics of southwest vortex, precipitation and boundary layer physical field are analyzed and compared. The results showed that six PBL schemes have obvious influence on simulating precipitation, moving path and intensity of SWV. The ACM2 can preferably reflect the change of track of SWV and the center position, intensity, and dispersibility of the precipitation. Different PBL schemes made significant differences in simulating geopotential height and wind, relative vorticity, vertical velocity and equivalent potential temperature field. Compared with other schemes, the positive vorticity of SWV simulated by YSU and QNSE can extend from the lower troposphere to 200 hPa, and the result of ACM2 was closer to the facts than others. Six PBL schemes performed better in the PBL height, surface sensible heat and latent heat fluxes, which the diurnal change is evident. Among these schemes, the QNSE simulated larger PBL height and surface heat flux, which was probably caused by more detailed physical processes such as the interaction between internal wave and turbulence, while the ACM2 made ones smaller. It can be seen that different PBL schemes in WRF model have great influence on the simulation of different physical quantity field of the SWV rainstorm process, choosing the appropriate PBL scheme can improve the forecasting accuracy of the SWV weather process.

Key words：parameterization scheme; southwest vortex; precipitation; boundary layer structure; numerical simulation