Abstract: High, resolution numerical simulation scheme is used to study the physical mechanism of the intensification of Typhoon LEO (1999), which develops from a tropical storm in South Chine Sea. The results show the transition from a tropical storm to a typhoon is caused by convective bursts near the storm center. The convective condensation heating effect helps to form a warm core and also a cyclonic circulation at upper levels. The merger of mesoscale vortices or the injection of mesoscale vortices to the storm center at lower levels might be the trigger of convective bursts.

Key words: intensification mechanism, convective burst, vortex merger

摘要： 利用高分辨率数值模拟方法,探讨了南海台风LEO(1999)由热带风暴发展成台风的物理机制结果表明：对流的突然爆发是LEO加强的原因,对流在高层的加热作用使暖心和气旋式流场在对流层高层迅速建立;而中小尺度涡漩合并(或向热带风暴中心的注入)可能是对流突然爆发的触发机制。

关键词: 加强机制, 对流爆发, 涡旋合并