“环高”热带风暴登陆后路径分析及其对辽宁暴雨影响

Analysis of the path of "Huangao" tropical storm and its contribution to the regional rainstrom in Liaoning

2003年第11号热带风暴"环高"在浙江省南部登陆后强度迅速减弱,但其残余云系及水汽仍然继续北上,为辽宁8月22—23日区域性暴雨提供了动力、热力、水汽及充分的能量。本文在分析热带气旋维持、北上条件的基础上,对此次暴雨的成因和物理量进行分析,指出北上热带气旋携带的暖湿空气为暴雨提供了热力条件;热带气旋北上使低空偏南急流加强并维持,为暴雨提供了必要的动力条件;热带气旋为这次暴雨过程提供了充足的能量;热带气旋是这次暴雨过程重要水汽来源。

The intensity of tropical storm weakened quickly after its landing in 2002. But the remaining cloud system and water vapor kept going northward. In this way, momentum, heat, water vapor and abundant energy were supplied for the regional rainstorm happened during 22-23 August in Liaoning. The weather condition under which the tropical cyclone was sustained and moved northward is analysed. Through studying the cause of the rainstm^n and doing diagnosis for the corresponding variables, this paper points out the following conclusions. The northward moving tropical cyclone brought the warm and moist air, which is in favor of the thermal conditions for the rainstorm. Low level southern jet was built up earlier and lasted for a longer time because of the northward moving of the tropical cyclone. This change in low level jet provided the dynamic conditions. The energy and water vapor of this rainstorm are supplied by the tropical cyclone.