3次回流倒槽作用下山西大(暴)雪天气比较分析  

Comparative Analysis of Three Heavy Snow in Shanxi Province Caused by Reflow and Inverted Rough

作　　者：赵桂香[1] 杜莉[2] 郝孝智[3] 张磊[1] 赵颖[4] 

机构地区：[1]山西省气象台,太原030006 [2]重庆市气象局气象服务中心,重庆401147 [3]山西省雷电防护监测中心,太原030002 [4]山西省大气探测技术保障中心,太原030002

出　　处：《中国农学通报》2013年第32期337-349,共13页Chinese Agricultural Science Bulletin

基　　金：国家自然科学基金项目"华北锢囚锋大(暴)雪天气结构特征及其预报技术研究"(41075030);中国气象局预报员专项"三次回流倒槽作用下山西大(暴)雪天气比较分析"(CMAYBY2011-005)

摘　　要：为进一步做好山西省降雪天气预报,为农业生产提供更为精细的气象服务,满足农业防灾减灾和政府决策需求。选取2011年2月9—10日、2月25—28日和2010年3月13—14日的3次回流与倒槽作用下产生的大雪或暴雪天气过程,利用多种探测资料,全面比较分析了3次过程的降雪特征、环流形势演变及流型配置、各种物理量特征及其差异。结果表明:(1)由于高低空流型配置、水汽输送特征和动热力结构特征存在较大差异,造成3次过程的降雪强度、强降雪落区和持续时间不同。(2)强降雪过程中,地面存在中尺度切变、中尺度涡旋和中尺度辐合3种结构,3种结构的降雪特征差异较大。(3)卫星云图上分别表现为高空槽云系过境型、槽后云团发展型和锋面云系影响型,TBB的变化和对流层中上层水汽含量的增加对预报强降雪有指示意义。因此,充分掌握这些特征及其差异,并提炼关键的预报技术指标,才是做好此类天气精细化预报的重要途径。In order to accurately forecast heavy snow in Shanxi, provide more fine service for agriculture production, and meet disaster prevention and reduction and government decision, the author chose three heavy snow caused by reflow and inverted rough such as February 9th-10th, 25th-28th, 2011, and March 14th-15th, 2010, using various sounding data, comprehensively comparative analysis snow characteristic, circulation situation and its configuration, physical quantity characteristic, and their difference. The results showed that： （1） Due to the difference among circulation configuration, transfer characteristic of water vapor, and dynamical and thermal structure characteristic, there were much difference among snow intensity, area, and time of duration. （2） In the process of three kinds of heavy mesoscale shear, mesoscale vortex, and mesoscale characteristic. （3） There were three cloud types such snow, there were three mesoscale structures such as convergence which have great difference of snow as high-level trough cloud transit, cloud development after trough, and frontal cloud system. The change of TBB and increase of water content in the upper troposphere had indicative significance for forecast of heavy snow. So, it was important way for fine forecast ofthis snow that fully understood these characteristics and their difference, and abstract key technical indicator of forecast.

关 键 词：回流倒槽 流型配置 新型探测资料 结构差异 

分 类 号：P467[天文地球—大气科学及气象学]