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“灿都”影响四川“100722”暴雨天气过程分析
引用本文:肖红茹,冯汉中,王瑾,陈朝平.“灿都”影响四川“100722”暴雨天气过程分析[J].四川气象,2011(1):20-25.
作者姓名:肖红茹  冯汉中  王瑾  陈朝平
作者单位:四川省气象台;国家卫星气象中心;
基金项目:公益性行业(气象)科研专项2010-2011年项目基于集合预报的中期概率预报技术研究(201006018)
摘    要:利用地面自动站降雨量资料和NCEP 1°×1°的每6小时再分析资料,从能量、南风脉动、温度平流和地形作用,分析了登陆台风"灿都"减弱后其外围偏东南气流向北输送造成四川盆地西部持续暴雨天气过程。结果表明:蒙古高压加强发展,然后与西伸加强的西太平洋副热带高压合并,形成阻塞形势、高空副散流场和西南季风的活跃都有利于南海源源不断的水汽输送到暴雨区辐合上升;暴雨发生在大气不稳定的层结环境中;台风登陆形成南风脉动造成暴雨区风速风向辐合明显,低层暖平流触发MCS发生发展,形成强降水;地形抬升作用加强暖湿气流辐合上升运动,促使暴雨增幅。

关 键 词:登陆台风  南风脉动  暖平流  地形抬升作用

100722 Heavy Rainfall Event over Sichuan Basin Caused by Typhoon Candu
XIAO Hongru,FENG Hanzhong,WANG Jin,CHEN Chaoping.100722 Heavy Rainfall Event over Sichuan Basin Caused by Typhoon Candu[J].Journal of Sichuan Meteorology,2011(1):20-25.
Authors:XIAO Hongru  FENG Hanzhong  WANG Jin  CHEN Chaoping
Institution:XIAO Hongru1,FENG Hanzhong1,WANG Jin2,CHEN Chaoping1(1.Sichuan Meteorological Observatory,Chengdu,610072,2.National Meteorology Satellite Center,Beijing,100081)
Abstract:Based on the precipitation data of automatic observations and NCEP(1°×1°)6h ranalysis data,the study on the persistent heavy rainfall event caused by the Typhoon Candu was made through the analyses on energy,south wind pulsation,temperature advection and terrain effect in the west of Sichuan Basin.The results show that the combination of Mongolia high and west of Pacific subtropical high,divergent stream filed in upper level and the active southwest monsoon benefit steady moisture into the South China Sea transporting to the rainfall area;the heavy rain occurred in the unstable atmospheric stratification environment;Pulsation formated by the landed typhoon cause wind speed and direction convergence significantly,lower warm advection trigger the development of MCS,topographic uplifting to strengthen the convergence of warm air rising and the rainfall was increased.
Keywords:Landed Typhoon  south wind pulsation  warm advection  topographic uplifting effect  
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