四川盆地一次西风槽和台风共同作用暴雨过程分析  

Analysis of a Rainstorm Process under the Joint Action of Westerly Trough and Typhoon in Sichuan Basin

作　　者：周懿 郭云云 余芳[3] ZHOU Yi;GUO Yunyun;Yu Fang(Sichuan Meteorological Observatory,Chengdu 610072,China;Heary Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province,Chengdu 610072,China;Weather Modification Office of Sichuan Prorince,Chengdu 610072,China)

机构地区：[1]四川省气象台,成都610072 [2]高原与盆地暴雨旱涝灾害四川省重点实验室,成都610072 [3]四川省人工影响天气办公室,成都610072

出　　处：《高原山地气象研究》2020年第2期11-17,共7页Plateau and Mountain Meteorology Research

基　　金：国家自然科学基金项目(41275103);高原与盆地暴雨旱涝灾害四川省重点实验室青年专项(SCQXKJQN2020023)。

摘　　要：利用NCEP 1°×1°再分析资料、国家自动站逐小时地面观测资料、FY4A红外云图云顶温度资料,分析了四川盆地一次少见的西风槽和台风共同作用下的区域暴雨过程。结果显示:(1)本次过程主要影响系统为西风槽和台风,二者在四川盆地形成有利锋生的变形场。(2)变形场中心位置乐山市产生了区域性大暴雨,盆地东部处于锋生区,致使雨带向东移动。(3)台风为此次过程贡献了大量水汽。西风槽和地形作用促使雨带大致呈东北-西南带状分布。(4)西风槽后冷空气和台风外围偏东气流产生地面辐合线,是乐山MCS触发的重要因素。Using NCEP 1°×1°reanalysis data,national automatic station surface data,fy4 a cloud top temperature data,the regional rainstorm process under the joint action of westerly trough and typhoon in Sichuan Basin is analyzed.The results show that:(1)the main influence system of this process is westerly trough and typhoon,which formed the deformation field favorable for frontogenesis in Sichuan Basin.(2)The center of the deformation field Leshan produced a regional heavy rain.The eastern part of the basin is located in the frontogenetic area,which causes the rain belt to move eastward.(3)Typhoon contributed a lot of water vapor to this process.The westerly trough and topography forcing promote the rain belt to distribute in Northeast-southwest.(4)The surface convergence line produced by the cold air behind the westerly trough and the easterly air flow around the typhoon is an important factor for triggering MCS in Leshan.

关 键 词：四川盆地暴雨 西风槽 台风 变形场 MCS 

分 类 号：P458.3[天文地球—大气科学及气象学]