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气象:2008,34(9):47-56
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河北2007年7月18日局地暴雨成因分析
(1.河北省气象台,石家庄 050021;2.河北省防雷中心)
Causality Analysis of“2007.7.18" Local Heavy Rain in Hebei Province
(1.Hebei Meteorological Observatory, Shijiazhuang 050021;2.;3.Hebei Province Lightning Protection Center)
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投稿时间:2008-02-10    修订日期:2008-03-25
中文摘要: 利用常规观测资料、逐小时自动站资料、TBB资料和NCEP再分析格点资料,对200 7年 7月18日河北省东北部和南部局地暴雨过程进行了诊断分析。结果表明:在相同的影响系统 作用下,河北省不同区域暴雨的形成机制却不同,高、低空急流及其耦合条件下急流和暴雨 相互作用是上午东北部暴雨的成因,低空急流直接输送水汽,在FY-2C云图上表现为云顶TBB<-70℃近乎圆形的中α尺度强对流云;而下午河北南部强降水是在高温高能 、层结不稳定 的有利条件下,地面冷锋及锋前低压形成的强辐合抬升触发不稳定能量释放产生的强对流天 气,对应云图上为最低TBB在-80℃以下的准东西向带状对流云系。逐小时地面自 动站资料分析的流场和计算的地面湿静力能对此类夏季强对流天气的预报具有指示意义。
中文关键词: 局地暴雨  急流  次级环流  湿静力能
Abstract:A local heavy rainstorm in northeast and southern Hebei on July 18, 20 07 is analyzed by using conventional observation data, hourly data of automated weather station, TBB data and NCEP 6 hour re analysis data. Conclusions are dra w n that although in the same synoptic system, the rainstorm formation mechanism i s different in different regions. It is revealed that the upper level and low le vel jet streams as well as the interaction between the positive feedback of the jets and rainstorm are the main reasons causing the north east rainstorm in the m orning. The vapor is transported by low level jet stream. There are round li ke meso α convective cloud clusters with TBB less than -70℃ in the image of th e FY-2C. The severe event in southern Hebei in the afternoon occurred under the f av orable conditions of the high temperature, high energy and unstable stratifica tion when instable energy was triggered and released by the co ld front and the low pressure before the front. In the corresponding images there are quasi trans me ridian convective cloud clusters with minimum TBB less than -80℃. The streams a nd surface humid static energy calculated from automatic weather stations data h ave significant indication to prediction of this sort of summer strong convectio n weather.
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杨晓亮,李江波,杨敏,2008.河北2007年7月18日局地暴雨成因分析[J].气象,34(9):47-56.
Yang Xiaoliang,Li Jiangbo,Yang Min,2008.Causality Analysis of“2007.7.18" Local Heavy Rain in Hebei Province [J].Meteor Mon,34(9):47-56.