“070304”东北特大暴雪的分析  

Analysis of the 4 March 2007 Heavy Snowstorm in Northeast China

作　　者：孙欣[1] 蔡芗宁 陈传雷[1] 贾旭轩[1] 乔小湜[1] 

机构地区：[1]沈阳中心气象台,沈阳110016 [2]国家气象中心,北京100081

出　　处：《气象》2011年第7期863-870,共8页Meteorological Monthly

基　　金：中国气象局新技术推广项目(CMATG2006Y02)资助

摘　　要：对2007年3月3—6日东北地区百年不遇的暴雪及暴雨过程进行了天气学背景分析,并对非地转湿Q矢量的贡献、降水相态变化的条件进行了分析。结果表明:范围广、强度强的偏南急流不仅是水汽的强劲输送带,而且是低层锋区和低值系统加强、移动的必要条件;次级环流的强迫作用在暴雨发生发展中起重要作用,其强弱与降水强度有直接关系。云系的高低与下落过程中的层结状态、低层锋区位置一定程度上决定了地面降水的相态。深厚强锋区、北上江淮气旋、低空急流、非地转湿Q矢量辐合上升支的强弱和位置与降水的强度、落区关系密切。In this paper,the synoptic background,the non-geostropic Q-vector contribution and the phase change of the conditions are analyzed in the process of heavy snowstorm and heavy rain in Northeast China during March 3-6,2007.The results have shown that：a wide range and strong southerly jet is not only a strong water vapor belt,but also the necessary conditions for the lower front and low-level system to strengthen and move;the forcing of secondary circulation in the torrential rain plays an important role in the occurrence and development of process,its strength is directly related with the rainfall intensity.The level of cloud systems and whereabouts in the process of stratification state of the lower front to a certain extent determine the phase state of precipitation on the ground.Deep strong front zone,Jiang-Huai cyclones, low-level jet,and the intensity of nongeostrophic Q vector are closely related with the location of precipitation band and its intensity.

关 键 词：暴雪 暴雨 天气学分析 湿Q矢量 降水相态 

分 类 号：P458.122[天文地球—大气科学及气象学]