两个偏北路径影响广西台风的降水差异分析

Analysis of precipitation difference between two northern ways affecting typhoon in Guangxi

通过对影响广西的1209号台风"苏拉"与0604号台风"碧利斯"这两个台风生成的季节、移动路径、强度、对广西的影响分析可以看出:副高西侧的东南气流对登陆后台风能够造成的降水强度有非常重要的意义;西南季风能否卷入到台风环流中也是其发展、维持、造成强降水的重要因素。台风登陆影响广西时会逐渐减弱,如果这时在西北太平洋靠近我国沿海有较强台风活动时,会对水汽和能量的输送有削弱作用,从而减小广西地区的降水。正是因为缺少这些因素,"苏拉"对广西造成的降水范围、强度都明显比"碧利斯"的小。

Typhoon ＂ Saola＂ of No. 1209 and No. 0604 typhoon ＂ Bilis＂ affecting Guangxi through the northward path. The born seasons, the moving paths, the intensity, and the influence time of the two typhoons are similar, however, the intensity of the precipitation are very different. According to the conventional observation data, the EC flow field, the wind field, and the satellite cloud map, the south- east air flow on the west side of the subtropical high is of great significance to the precipitation intensity caused by the typhoon after landing. Whether the southwest monsoon being involved in the typhoon circulation is also an important factor for its development, maintenance, and heavy rainfall. When typhoon landing affects Guangxi, it will gradually weaken. If there is a strong typhoon in the Northwest Pacific near the coast of China, it will weaken the transport of water vapor and energy, which reduces the precipitation in the Guangxi. Thus, the smaller than that of ＂ Bilis＂ . precipitation range and intensity of Saola＂ in Guangxi is