山西北部一次飑线大风的多普勒雷达资料特征分析

利用大同多普勒雷达的基本反射率因子、组合反射率因子、速度剖面图、垂直液态含水量、回波顶及vwP产品，结合环流形势和自动站分钟数据资料，对2010年6月16日发生在大同地区的飑线天气过程进行分析发现，这次飑线过程是在高中低三层冷涡环流控制及地面锋前暖区的流型配置下发生的；飑线过境时压、风、温三要素出现剧烈变化；飑线过境时，2个大风站出现速度极大值的时间与外流边界的影响时间相吻合，4个大风站出现速度极大值的时间与强回波下沉气流影响时间相对应。分析结果表明：冷涡携带的冷空气使飑线后部入流不断得到补充。前侧暖湿气流沿着后部人流爬升，不断产生新的单体，是飑线能够维持、发展的主要原因；飑线前侧暖湿气流倾斜上升，主体部分向人流倾斜，与冷空气汇合形成下沉气流并向外扩散，与前侧人流形成弧状的阵风锋是此次飑线的垂直流场结构特征。

Analysis of a Gale of Squall Line in North of Shanxi Province Based on Doppler Radar Data

The Weather process of squall line which occurred in Datong region on June 16, 2010 was analyzed based Doppler radar the reflectivity factor, combined reflectivity factor, velocity profiles, the top of echo and VWP products and combining with the circulation situation and the minute data of automatic station. The results show that the cold air which was carried by the cold vortex strengthened the rear inflow of squall line. The front warm-wet flow rise along rear inflow and the new cell was generated. It was the main reason of the squall line keeping and developing.