吴忠市2008年1月连阴雪天气过程分析

利用常规气象资料和物理量场实况分析资料，应用天气学原理和方法对2008-01-19-23宁夏吴忠市连阴雪天气过程进行分析．结果表明，连阴雪天气发生在高空稳定的形势下．巴尔咯什湖冷空气的不断南下和西太平洋副热带高压的稳定维持，为连阴雪天气提供了有利的环流背景．低空稳定的暖湿西南气流和辐合区为连阴雪的产生提供了水汽和能量．极地冷空气的不断南下使地面冷高压较强且持续控制，造成持续低温天气．连阴雪的动力场的空间分布是涡度、垂直速度中心随高度向北倾斜，降水区上空涡度、垂直速度的绝对值偏小，大气层结处于稳定状态．

Analysis on the continuous snow weather process in January 2008

The continuous snow weather occurred on 19-23 January 2008 in Wuzhong city of Ningxia is analyzed by using regular meteorological data and physical field fact data with weather science and method.The results show that the continuous snow weather occurred under steady aerial circumstance.The continual cold air from Lake Baerkashi(for short Lake Ba below) and stable persistence of the west Pacific subtropical high were the favorable circulation environment.The lower stable warm-moist air from southwest and convergence field provided vapour and energy for the continuous snow.The continual cold air came from arctic-land moving southward formed strong surface cold high.The lasting control of cold high caused the continuous low temperature weather in Wuzhong city of Ningxia.The space distribution of power field about the continuous snow had the characteristics that vorticity and vertical speed center sloped up to northward with height and the absolute value of vorticity and vertical speed were smaller in snowfall upper space.The stratified atmosphere was stable.