1971-2024年影响嘉善县的热带气旋及风雨分布特征OA

In order to provide a scientific meteorological basis for forecasting of wind and rain impacts caused by tropical cyclones in Jiashan county in the future,statistical analysis meth-ods were used to study and analyze tropical cyclones and related meteorological elements in Jiashan County from 1971 to 2024.The results show that an average of 3.2 tropical cyclones have affected Jiashan county every year since 1971,with the peak period of influence concen-trated from mid-July to late September.In addition,the paths of tropical cyclones affecting Jiashan county can be divided into 7 categories:Landing in South China,landing in Fujian and Taiwan,landing in Zhejiang,landing in Shanghai,landing in Jiangsu and areas to the north,turning northward within 127°E(inclusive)and turning northward outside 127°E.Tropical cyclones landing in Zhejiang accounted for more than half of the processes with heavy rain and above.Only 17.8%of the tropical cyclones caused gale weather of level 8 and above.From the perspective of seasonal characteristics,the proportion of heavy rain and above processes caused by tropical cyclones in summer and autumn is similar,while gale processes of level 8 and above are mainly caused by tropical cyclones in summer.The Pear-son chi-square fitting test shows that the frequency of tropical cyclones affecting Jiashan county is independent of El Niño and La Niña events,indicating that the impact of tropical cyclones on Jiashan county is less affected by the climate background.