东亚季风区夏季准定常环流系统气候特征及月内演变的数值模拟

UMERICAL SIMULATION OF MEAN CLIMATE PROPERTIES AND THEIR INTRAMONTHLY VARIATION OF SUMMER QUASI-STATIONARY CIRCULATION SYSTEMS OVER EAST ASIA MONSOON AREA

利用P—σ混合坐标系5层区域气候模式，研究了东亚季风区夏季准定常环流系统的月平均气候特征及其时间演变，结果发规模式在一定的海陆分布、地形及模式物理过程等的综合作用下可以较好地模拟出东亚季风区夏季准定常环流系统的月平均气候特征，各高度上的主要环流系统以及高原地区的经圈环流与实际情况较为一致，准定常环流系统的时间变化主要发生在模式积分的前15天中，在此后的时间积分过程中环流系统的变化比较缓慢，大陆暖中心、低压中心以及季风强度指数等的时间演变和相关系数、均方误差及误差标准差的分析都能说明这一点。

The basic characteristics of summer quasi--stationary circulation systems and their intramonthly evolutions in East Asia monsoon area are studied by use of a five-layer regional climate model system with P-σ incorporated coordinates. Results show that this model can simulate the summer quasi-stationary circulation systems of East Asia monsoon area comparatively well under the comprehensive effect of land - sea distribution, topography and model physical pIocesses etc. It also confirms that summer quasi - stationary circulation systems' temporal variation largely appears in the first l5 model days and then tends to bestable. These properties can be proved by the evolution of the geopotential height and tem-perature in quasi-stationary systems' centers and by the statistics of correlation coefficient,mean square errors and standard errors between the simulated geopotential height and the GFDL analyzed data.