一η坐标模式降水预报敏感性试验  

Sensitivity Experiments on Precipitation Forecast of a η-Coordinate Model

作　　者：何光碧[1] 滕家谟[2] 

机构地区：[1]中国气象局成都高原气象研究所,四川成都610072 [2]四川省气象局,四川成都610072

出　　处：《高原气象》2003年第B10期126-131,共6页Plateau Meteorology

基　　金：中国气象局成都高原气象研究所高原气象开放实验室基金项目资助

摘　　要：采用η坐标模式,对1995年8月23～24日四川盆地西部一次强降水过程进行了降水敏感性试验。试验结果表明:适当放宽饱和凝结比临界条件,可增大大尺度降水成分,但对不同地域、不同季节需适当调整饱和凝结比。减小积云活动特征时间,将导致积云对流降水增大,总降水也增大;当增大饱和气压差绝对值时,对降水的范围、中心预报及其演变有一定程度改进,与实况较为接近。The sensitivity experiments on a heavy precipitation process in the west of Sichuan Basin on August 23～24, 1995 have been done by using a ηcoordinate model.The results revealed that when properly relaxing the condition of saturation condensation ratio, the amount of large scale precipitation will be increased, but based on different aeras and seasons, the saturation condensation ratio should been adjusted properly.Lessening character time of cumulus activities will lead to increase in cumulus convective precipitation. When increasing the absolute value of saturation air pressure difference, there have been some improvements in the area, intensity and evolution of precipitation, which is closer the observed.

关 键 词：Η模式 降水预报 饱和凝结比 积云活动特征时间 敏感性试验 

分 类 号：P457.6[天文地球—大气科学及气象学]