【摘要】 综合运用诊断分析和数值模拟的方法，对１９９１年７月４～７日的暴雨个例进行了研究，提出由凝结加热作用导致梅雨锋α中尺度气旋发展与降水增强之间的正反馈机制概念模式，即凝结加热产生负变压，辐散风动能促进中气旋发展，同时上升运动得到增强，降水增幅。更多还原

【Abstract】 Diagnostic weather analysis and numerical simulation are both used to establish a positive feedback mechanism conceptual model for the growing of meso-α scale cyclone on the Meiyu front. The model is as follows: condensational heating generates negative allobar, divergence wind kinetic-energy promotes the meso-α scale cyclone growing, and in the meantime, updraft movement is also reinforced and the precipitation thus increases.更多还原