台风海棠与中纬度系统相互作用对河南暴雨的影响  

Impact Analysis of Interaction between Typhoon "Haitang" and Mid-Latitude Systems on Rainstorm in Henan

作　　者：张霞 王咏青[2] 王君[3] 王建玲[4] 

机构地区：[1]河南省气象台,郑州450003 [2]南京信息工程大学 [3]河南省气象科学研究所,郑州450003 [4]郑州市气象局,郑州450005

出　　处：《气象科技》2008年第1期55-62,共8页Meteorological Science and Technology

基　　金：国家自然科学基金项目(40405009);江苏省科技厅社会发展项目(BS2005055);河南省气象局科学研究课题资助

摘　　要：应用Barnes滤波原理,构建合适的带通滤波器,获取了中尺度信息,对2005年7月21-24日台风“海棠”登陆后与中纬度系统相互作用给河南省造成的暴雨过程进行了分析。结果表明：在台风外围大尺度气旋性环流中,中尺度低压、中尺度辐合线和辐合区是此次暴雨的直接影响系统;台风低压移近后,与西太平洋副高之间气压梯度加大,可以在副高西南侧形成东南风低空急流,东南急流的形成促使中尺度系统加强和发展;干冷空气自对流层中层向低层伸展,与低层的暖湿气流交汇,使对流和暴雨加强。Based the theory of Barnes filtering, an appropriate band-pass filter is designed, with which the mesoscale data were obtained. The heavy rainstorm in Henan in from 21 to 24 July 2005 resulted from the interaction between Typhoon Haitang and mid-latitude systems is analyzed. The results show that the mesoscale disturbance low, mesoscale convergence line, and convergence areas within the large-scale cyclonic circulation outside the typhoon are the direct influencing systems of the rainfall storm. The large-scale circulation provided abundant vapor sources and a potentially unstable condition for heavy rain, but the mesoscale weather system played an important role in the enhancement of vapour convergence and upward transportation.

关 键 词：暴雨 带通滤波 中尺度低压 东南风急流 

分 类 号：P458[天文地球—大气科学及气象学] P458.121.1