【摘要】 本文利用一个中尺度三维数值模式，对下垫面气旋发展过程中的影响进行了数值模拟，初步研究了区域性下垫面特征的变化对梅雨锋气旋和暴雨的影响．其结果表明，沙漠引起的温、湿、风的变化导致一个发展成熟的江淮气旋在午后进入沙漠试验区后，气旋的移速减慢，强度增大，在试验区边界附近暴雨增强，而试验区中心附近则降水减小．更多还原

【Abstract】 A meso-scale numerical model is used to simulate the effects of the variation of local underlyingsurface characteristics on Mei-Yu front cyclone associated with heavy rain. It is found that when a mature cyclone propagates into a local desert area in the afternoon,it will tend to move slowly and to intensify with heavier rain due to the variation of thermal,moisture and wind fields caused by local desert.更多还原