【摘要】 利用山西省北部大同地区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了分析。结果表明:这次飑线过程发生在高中低三层的冷涡环流形势和地面冷锋前的暖区;飑线过境时压、风、温三要素出现剧烈变化;研究极大风速≥16.8 m.s-1的台站时发现:飑线过境时两个站出现的速度极大值与外流边界的影响时间相吻合,四个站出现的速度极大值与强回波下沉气流影响时间相对应;冷涡携带的冷空气使飑线后部入流不断得到补充,而前侧暖湿气流沿着后部入流爬升,不断产生新的单体,是飑线能够维持、发展的主要原因。更多还原

【Abstract】 By using the basic reflectivity factor,the composite reflectivity factor,the speed profile map,the vertical liquid water content,the echo tops and the vad wind profile of Doppler radar products for Datong area of the north of Shanxi Province,and combined with circulation situation and automatic weather station data,this paper analyzes a squall line process happened in Datong area on June16,2010.The results show that the squall line process occurred at high,middle and lower layers cold vortex circulation situation;Atmospheric pressure,temperature and wind velocity alter sharply when squall go through.In studying the stations with maximize wind speed ≥16.8 m·s-1,it is discovered that the time occurring maximum velocity in two stations is in accord with that of outflow boundary effect,the time of,maximum velocity value in four stations correspond to sink effect time of powerful echo;The cold air carried by cold eddy makes the air flowing into the tail of squall to be continuously added,but the warm moisture flow in front side continuously produce a new single body,and that is the main reason of maintenance and development of squall line.更多还原