不同边界层和陆面过程参数化方案对比分析

利用WRF模式选用不同的边界层参数化方案 (YSU、MRF) 结合三种陆面过程方案 (RUC、SLAB、Noah) , 模拟了2011年5月1~3日的四川东部暴雨过程, 对不同参数化方案结合不同陆面过程结果进行对比试验基础上发现, 模式对24h降水落区及强度有较强预报能力, 但对单站小时降水分布的预报能力还需改进;不同边界层方案与陆面过程的对比试验说明降水对于边界层物理过程有一定敏感性, 各试验的差异主要体现在对暴雨中心雨强以及降水峰值强度和峰值出现时段的预报上;WRF模式基本上能够模拟出边界层要素日变化特征。 

Numerical Studies of Different Planet Boundary Layer Parameterization and Land Surface Model Parameterization

Two different planet boundary layer parameterizations(YSU、MRF) with three land surface model(RUC、SLAB、Noah) in WRF model are used to simulate the heavy rainfall in eastent Sichuan during May 1-3,2011.The different parameters of the program with different land surface model contrast experiment shows that the WRF model can forecast effectively 24h rainfall intensity and area,but the forecast capacity of precipitation per hour in the single station needs to be improved;different PBL parameterization and land surface model contrast experiment shows that the precipitation has certain sensitivity on PBL parameterization,the differences between every experiment mostly on the forecast of the center of heavy rainfall and peak value of rainfall and peak periods;WRF model is essentially to simulate the diurnal variation of boundary layer elements.