2019年江苏两次江淮气旋暴雨大风过程分析  

Analysis of two rainstorm and gale processes of Jianghuai cyclone in Jiangsu Province in 2019

作　　者：颜佳任 王伟健 张红华[1] 史达伟 Yan Jiaren;Wang Weijian;Zhang Honghua;Shi Dawei(Lianyungang Meteorological Bureau,Lianyungang Jiangsu 222006)

机构地区：[1]连云港市气象局,江苏连云港222006

出　　处：《气象研究与应用》2021年第2期83-89,共7页Journal of Meteorological Research and Application

基　　金：江苏省预报员专项(JSYBY201906)。

摘　　要：使用多种观测资料和NCEP 0.25°×0.25°再分析资料,对江苏地区2019年3月19—20日(简称"0320"过程)和2019年4月8—9日(简称"0409"过程)两次江淮气旋暴雨大风过程进行分析。结果表明,"0320"过程上升运动和水汽辐合区都位于淮北地区,上升运动呈区域性分布,是"0320"过程产生区域性暴雨的重要原因。"0409"过程水汽辐合区和上升运动区域分布不均,因此暴雨落区相对分散。受海上热力条件、高层正涡度平流及气旋后部强冷平流的共同作用,"0409"过程气旋入海后迅速发展,气旋后部风速明显增大,气旋大风叠加对流大风是沿江苏南地区区域性偏西大风的主要原因。"0320"过程海上热力条件、高层正涡度平流及低层冷平流较"0409"过程弱,尤其是气旋发展阶段冷平流不强,因此气旋入海后发展不明显,只造成江苏出现局部性的大风天气。利用云水混合比来分析气旋发展的结构特征,对气旋如何演变有更直观的认识。Using a variety of observational data and NCEP 0.25°×0.25°reanalysis data,two heavy rain and gale processes of Jianghuai cyclone in Jiangsu Province on March 19-20,2019(referred to as the"0320"process)and April 8-9,2019(referred to as the"0409"process)were analyzed.The results showed that the upwelling and water vapor amplitude confluence area of the"0320"process were located in area north of the Huai River,and the upwelling was regional distribution,which was an important reason for the regional rainstorm of the"0320"process.During the"0409"process,the areas of water vapor amplitude and the ascending motion were unevenly distributed,so the rainstorm areas were relatively scattered.Affected by the sea thermal conditions,and the combined action of the high-level positive vorticity advection and the strong cold advection at the back of the cyclone,the"0409"process cyclone developed rapidly after entering the sea,and the wind speed at the back of the cyclone increased significantly.The cyclone gale superimposed with convective gale was the main cause of the regional westerly gale in the south of Jiangsu Province.The results showed that the"0320"process was weaker than the"0409"process in the sea thermal conditions,positive vorticity advection in the upper layer and cold advection in the lower layer,especially in the cyclone development stage.Therefore,the development of the cyclone after entering the sea was not obvious,which only caused the local gale weather in Jiangsu Province.Using the cloud-water mixing ratio to analyze the structural characteristics of cyclone development can have a more intuitive understanding of how the cyclone evolves.

关 键 词：江淮气旋 暴雨 大风 云水混合比 

分 类 号：P457[天文地球—大气科学及气象学]