本文利用中国科学院大气物理研究所LASG(IAP)的区域暴雨模式AREM,对2007年7月四川地区的天气过程进行数值试验和分析,结果表明采用不同的地表参数化方案模拟的地表潜热通量在地形复杂的高原东部边坡地带的差异最大,直接导致该区域降水模拟的显著偏差,这一结果同时表明四川盆地降水和地表潜热通量之间有着密切的关系。通过对敏感性试验结果的分析,表明局地下垫面水汽通量是通过改变低层大气的层结结构来影响降水的强度和主要降水时段的。
By using the AREM ( Advanced Regional Eta - coordinate Model) developed by LASG/IAP/CAS, we simulated and analyzed weather processes occurred in the Sichuan basin during July 2007. The study reveals the maximum difference region of the surface la- tent heat flux calculated by different surface parameterization located in the western Sichuan basin to the east of the Tibetan Plateau with com- plex topography, which directly cause the simulated significant errors for rainfall. The experiments results also show there is a close relation- ship with Sichuan heavy rain and the surface latent heat flux. By changing the stratification structure of low level atmospheric, the local water vapor flux from underlying earth surface would affect the precipitation intensity and main precipitation period.