区域气候模式对中国东部季风雨带演变的模拟

本文给出了应用区域气候模式对中国东部夏季雨带演变过程模拟的主要结果。模拟试验分别对正常季风年（1979）和湿季风年（1991）（均由观测场驱动）以及连续3年（全球大气环流模式驱动）的夏季降水场进行，并同观测场进行了比较。结果表明，模式基本上能抓住夏季雨带的主要位置和它的演变特征，与实况相比明显优于全球模式的结果。但模拟的雨带具体位置并不总是与观测值十分吻合，有些旬（或候）差别比较大，模拟的降水量与观测值的相关系数最大仅0.40左右。以上结果表明，为正确模拟东亚季风雨带的演变还需要对决定区域气候的主要物理过程在参数化方面作进一步的改进。

Simulation of the Evolution of Summer Monsoon Rainbelts over Eastern China from Regional Climate Model

This paper presents the results of simulating the evolution of 5-day or 10-day mean summer monsoon rainbelts over the eastern China based on the regional climate modeling experiments which include a normal monsoon year (1979) and a wet monsoon year (1991) (driven by observational analysis), and a continuous 3-year integration driven by GCM outputs In comparison with the observed precipitation fields, the model has shown its capacity to generally catch up the location of main rainbelts and to reproduce the major characteristics of their evolution; better than those simulated from GCMs However, the simulated rainbelts do not always exactly coincide with the observed ones In some pentads or decades, there are significant differences between model simulations and observations The total correlation coefficients between observed and simulated precipitation are less than 0 40 The obove results indicate that the parameterization schemes of main physical processes in the regional climate model need to be further improved when applied to East Asia monsoon regions