摘要
利用区域气候模式RegCM3对江淮流域梅雨期的降水和大气环流进行10 a的数值模拟,通过与再分析和观测资料的对比,评估RegCM3对江淮流域梅雨期降水和大气环流特征的模拟能力。数值模拟结果的分析表明,RegCM3能够较好地模拟出江淮流域梅雨期大气高低空环流的基本配置、相应的强湿度梯度和弱温度梯度等基本特征以及江淮流域上空的假相当位温湿舌和其北侧的强梯度带,从而较为合理地再现了梅雨期雨带的位置。与此同时,模拟结果的不足主要表现在模拟的梅雨锋强度偏弱,对流不稳定能量释放位置偏南,江淮流域降水偏少,华南地区降水偏多。
The performance of RegCM3 in simulating the rainfall and associated circulation in Meiyu Period of the Yangtze-Huaihe river valleys is examined in comparison with the reanalysis data and observation.The results show that the RegCM3 can simulate the basic configuration of atmospheric circulation at high and low levels and successfully reproduce the main characteristics in the strong humidity and weak temperature gradient in the Meiyu period in the Yangtze-Huaihe river valleys.The humidity tongue of pseudo-equivalent potential temperature over the valleys and the strong gradient zone to the north are also well simulated.As a result,the Meiyu rain belt is basically simulated.Nevertheless,the simulated Meiyu front is relatively weak and the location of convective instability energy release is far south in comparison with that in the reanalysis data,resulting in the less simulated rainfall in the Yangtze and Huaihe river valleys and abundant rainfall in South China region.What is responsible for the bias and how to improve the performance of RegCM3 need to be further studied.
出处
《气象科学》
CSCD
北大核心
2012年第2期119-126,共8页
Journal of the Meteorological Sciences
基金
国家重点基础研究计划(973计划)项目(2011CB952002)
关键词
梅雨期降水
环流形势
模拟性能
Rainfall in Meiyu period
Atmospheric circulation
Model performance
