中文摘要：

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。

英文摘要：

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.