2009年11月华北暴雪过程的诊断分析  

Diagnostic Analysis on Snowstorm Process in North China in November 2009

作　　者：张迎新[1,2] 张守保[2] 裴玉杰 张南[1,2] 

机构地区：[1]河北省气象台,河北石家庄050021 [2]河北省气象与生态环境实验室,河北石家庄050021

出　　处：《高原气象》2011年第5期1204-1212,共9页Plateau Meteorology

基　　金：国家自然科学基金项目(40875024);公益性行业(气象)科研专项经费项目(GYHY200906011);河北省自然科学基金项目(D2008001282);河北省科委重点项目(052435183D);国家科技支撑项目(2008BAC37B01)共同资助

摘　　要：利用常规和非常规观测资料、TBB资料、雷达资料及NCEP再分析资料,对2009年11月华北地区暴雪过程进行了诊断分析,结果表明:(1)这次暴雪过程的主要影响系统为500hPa西风带低槽、700hPa西南风急流及东西向切变、850hPa东北风急流和地面倒槽;(2)东北南下的冷空气为干冷空气;(3)暴雪过程中存在中尺度系统:中尺度低涡及切变,且强降水中心与之配合;(4)中尺度云团在700hPa切变上生成、发展、合并且东移;(5)雷达回波呈现出混合性降水回波特征;在风廓线反演产品中发现边界层和中低层风速加大与降水加强有很好的对应关系,且在边界层顶高度上下出现浅薄的冷平流层后,边界层内东北风变得有组织且风速增大。(6)VDRARS雷达反演的风场显示:东北南下的冷空气(东北风)与西南气流相遇形成鞍型流场,强回波出现在鞍型流场中。Using the conventional and unconventional observations,satellite TBB,radar and NCEP reanalysis data,the snowstorm process in North China in November 2009 was diagnostically analyzed.The results showed that：（1） The snowstorm process on 9～12 November 2009 is mainly affected by 500 hPa westerly trough,700 hPa south-westerly wind jet and wind shear,850 hPa northeasterly wind jet and inverted trough on the surface;（2）Return flow coming from Northeast China is relatively dry;（3） There are mesoscale vortex and shear in the snowstorm process,and the snowfall center locates at mesoscale shear;（4） Mesoscale cloud generates,developes and merges on 700 hPa shear;（5） The wind direction are discontinuous in vertical,NE in lower level and SW in middle level.The vertical shear is observed on VAD.The start and end time of precipitation are closely related to the wind direction,including NE of boundary layer and SW wind in middle level;（6） VDRARS radar retrieved horizontal wind field showed that the mesoscale saddle field is formed between northeasterly and southwesterly flow,and strong radar reflectivity appears in the saddle flow field.

关 键 词：华北暴雪 诊断分析 中尺度系统 

分 类 号：P426.634[天文地球—大气科学及气象学]