中文摘要：

利用中尺度数值模式MM5模拟和分析了辽宁中部城市群各个季节的边界层气象场特征。模拟结果显示：在边界层内，由流场的分布造成污染物的滞留最有可能发生在冬季，其它季节由于各自的原因会使污染物疏散而不易造成污染。同时，逆温也是导致污染物堆积的一个重要原因，研究表明对于城市群内的5个城市，逆温现象主要出现在冬季，在其它季节不常见。另外，一旦近地层湿度大到可以形成雾，在冬季会使大浓度的污染物附着在上面，对人体健康构成很大的威胁。

英文摘要：

A numerical study is made on the meteorological field of boundary layer in each season of the city group in middle Liaoning by means of MM5 model. The results show that in the boundary layer,the pollutants mainly can be sustained in winter but they can be evacuated to avoid pollution in other seasons. At the same time, inversion is another important factor to make pollutants sustained. Studies show that in the five cities of the middle Liaoning,inversion doesn＇t appeare in other seasons frequently but in winter. In addition ,once the humidity is high enough to form fog and stick to pollutants, people＇s health will be harmed prodigiously.