南极长城站雪暴的个例研究  

A CASE STUDY ON SNOW STORM AT GREAT WALL STATION,ANTARCTICA

作　　者：杨清华[1,2] 尹朝晖[1] 张林[1] 邢建勇[1] 苏博[1] 

机构地区：[1]国家海洋环境预报中心,北京100081 [2]国家海洋局第二海洋研究所,杭州310012

出　　处：《极地研究》2010年第2期141-149,共9页Chinese Journal of Polar Research

基　　金：科技部"十一五"国家科技支撑计划重点项目(2006BAB18B03);国家自然科学基金重点项目(40930848);国家863计划项目(2008AA121704);国家海洋局青年海洋科学基金(2008219;2010215)资助

摘　　要：使用地面观测和NCEP全球对流层分析资料,从地面和高低空天气形势、气象要素和大气垂直水平结构演变等方面对2006年8月29日南极长城站的一次强雪暴天气过程进行了分析研究。雪暴由"南高北低"天气形势对应的偏东大风引导,高空暖平流输送提供了水汽条件,有利的涡度散度场配置和强烈的大气垂直上升运动使高层暖空气和低层冷空气充分混合,是导致强降雪、进而引发雪暴的动力原因。雪暴后期伴有明显的低层逆温,它对雪暴后期的维持可能起着重要作用。A case of snow storm at Great Wall Station （GWS） was studied using data of NCEP analysis, in-situ observations and surface weather charts. The storm took place on August 29th, 2006, bringing very high winds and poor horizontal visibility there. It＇s found that this storm occured under a situation of High in the south and low in the north＇. Low level easterly jet from the Antarctic continent caused significant decrease in air temperature and humidity, making the storm with an obvious feature of low temperature and humidity. Warm air advection at high level brought enough vapor from lower latitudes. Deep cyclonic vorticity at middle and low level, configuration of divergence at high level and convergence at low level, together with strong vertical uplifts were the dynamic reasons of the strong snow fall and even the snow storm. There was an inversion layer in the low-level atmosphere during the later phase of the storm; this kind of vertical structure of ＇ cold at low level and warm at high level＇ may be very important to the lasting of the snow storm.

关 键 词：雪暴 吹雪 气旋 南极 长城站 

分 类 号：P426.634[天文地球—大气科学及气象学]