区域气候模式RegCM2对标量粗糙敏感性试验

在地气通量的计算中,一般没有考虑温度、水汽、动量的相应粗糙度之间的不同。本文将标量粗糙度Z0T和Z0q引入区域气候模式RegCM2的陆面过程BATS中,用1991年6月与7月的观测资料作了三组敏感性试验,并同实况进行了比较。结果表明：在区域气候模式RegCM2中引入标量粗糙度后,提高了地气间感热通量与潜热通量的计算精度,改善了地表温度和地表比湿的模拟,进而改变了降水的模拟,表明区域气候模式对标量粗糙是敏感的,并且在晴天状况下更为敏感。

EXPERIMENT ON THE SENSITIVITY OF REGCM2 TO SCALAR ROUGHNESS LENGTHS

In order to study the sensitivity of regional climate model RegCM2 to scalar roughness lengths,three simulation experiments with observational data during June,July 1991 have been conducted by using RegCM2 with scalar roughness length Z 0T and Z 0q introduced to BATS.The results show that:RegCM2 with scalar roughness lengths included can simulate the distributions of monthly precipitation,monthly mean surface temperature and specific humidity more accurately due to the more reasonable simulations of the sensible and latent heat fluxes between surface,vegetation and atmosphere,so we concluded that regional climate model RegCM2 is sensitive and even more sensitive in fine days to scalar roughness lengths.