台风“利奇马”与“云娜”对浙江风雨影响的对比分析

Contrast analysis of effects of typhoon“Lekima”and“Rananim”on precipitation and wind in Zhejiang Province

利用浙江省自动站气象要素资料、FNL全球分析资料和雷达资料,对比分析路径相似的2019年台风“利奇马”和2004年台风“云娜”给浙江带来的影响。结果表明:“利奇马”风雨大值区位于浙东和浙北,“云娜”风雨大值区位于浙东和浙南;“利奇马”带来的整体降水比“云娜”带来的降水大,但单站雨量极值“云娜”强于“利奇马”;极端大风“利奇马”强于“云娜”。究其原因与台风登陆时的强度、登陆后移动路径、滞留时间等有很大关系。环境场的不同对台风路径产生影响,也影响台风的不对称结构,进而影响台风带来的风雨分布。极端降水与降水条件和台风滞留时间有很大关系,极端大风与台风自身结构和强度、海岛位置有关。

By using meteorological data from medium-scale automatic meteorological stations in Zhejiang,the FNL operational global analysis data,and the radar data.The effects of Typhoon“Lekima”(2019)and“Rananim”(2004)on Zhejiang Province were comparatively analyzed.Results show that the center of precipitation and wind of Lekima is mostly distributed in the eastern and northern Zhejiang,but“Rananim”is mostly in the eastern and southern Zhejiang.The average rainfall of“Lekima”is more than that of“Rananim”,but the extreme precipitation in one station is less than“Rananim”.The extreme wind of“Lekima”is stronger than that of“Rananim”,what is related to the intensity of typhoon landing,the track after landing,detention time in a place,and so on.Different environmental fields have impacts on typhoon track,asymmetric structure of typhoon and the distribution of precipitation and wind brought by typhoon.Extreme precipitation is closely related to precipitation conditions and influencing time.Extreme strong wind is related to the structure and intensity of typhoon and the location of islands.