RegCM3模式对中国东部夏季降水的模拟试验

A Simulation of Summer Precipitation over Eastern China with RegCM3

利用最新发布的区域气候模式RegCM3对1998年5—8月中国东部降水进行了模拟试验,考察了模式对降水和大尺度环流系统的模拟能力。结果表明:不同对流性降水方案对不同月份、不同区域的降水模拟效果差别较大,采用Kuo方案和Grell方案时模拟的降水效果要好于BM方案;RegCM3能较成功地再现异常降水的月际尺度变化和空间分布等基本特征;模式还较好地模拟了西太平洋副高脊线的演变过程和两次向北传播的季节内振荡。该模式可应用于中国东部夏季风降水的研究。

A new regional climate model RegCM3 has been used to simulate summer precipitation in May-August 1998 over Eastern China,and its capability of simulation for precipitation and large-scale circulation systems is investigated.The result shows that different convective schemes made large differences in the simulation of rainfall for different months and regions,the schemes of Kuo and Grell exhibited better performance than the scheme of BM;the RegCM3 could well reproduce the main features of monthly variation and spatial distribution of rainfall;it also well simulated the evolution of subtropical anticyclone ridge in the Western Pacific and two northword-propagating intraseasonal oscillations.Therefore we consider that the model can be applied to the study of summer precipitation simulation over Eastern China.