2005年12月3～4日山东半岛暴雪准静止对流云带演变的分析  

Analysis of the Quasi-Stationary Cloudbands of a Cold-Air Outbreak Snow-Storm Event of the 3～4 December 2005 in the Shandong Peninsula

作　　者：朱先德[1] 吴增茂[1] 周淑玲 袁海豹 

机构地区：[1]中国海洋大学,山东青岛266100 [2]山东省威海市气象局,山东威海264200 [3]山东省烟台市气象局,山东烟台264001

出　　处：《中国海洋大学学报（自然科学版）》2007年第S2期8-16,共9页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(40675068)资助

摘　　要：2005年12月3~4日山东半岛发生了一次强降雪过程,文登最大雪深达到了35 cm,产生此次暴雪的对流云带主要位于烟台和威海沿岸区域,呈西北-东南走向排列。利用气象常规观测和雷达资料,以及中尺度数值模式MM5的模拟结果对该降水过程进行了分析和研究。分析结果表明:该准静止对流云维持了近12 h,并且对流最强时云高在烟台附近海域达到了500 hPa。这次强暴雪是在有利的大尺度背景条件下,在不断补充的冷空气受暖湿的渤海和半岛地形影响下产生的。又由于海陆温差较大和风场的非地转性切变,在山东半岛北岸形成海岸锋,它的产生和存在增加了半岛的局部降水量,其次级环流的产生和维持决定了雪暴落区的分布。同时,夜间产生的陆风也对对流云的产生和维持起到重要的作用。On 3～4 December 2005 a Quasi-stationary convective cloud band which was located over the coast area of Yantai and Weihai resulted in a severe cold-air outbreak snow storm and brought a snowfall of about 35 cm in Wendeng.Using the radar data and the routine observations as well as the results of simulation by the mesoscale model-MM5,we studied this severe cold-air outbreak snow storm event.The results show that the snowband maintained approximately 12 h and its height reached 500 hPa at Yantai.This snow storm event was generated due to the joint action of the favorable synoptic circulation and both thermodynamic forcing caused by the warm Bohai-sea surface and dynamic forcing by the topography.The coastal front was generated due to the sea and land temperature difference and the ageostrophic wind,which brought an obvious increase of local snow fall and whose secondary circulation controlled the distribution of snowfall.Meanwhile the weakened land breeze which was formed at night was significant for the formation and maintenance of the convective cloud band.

关 键 词：山东半岛 海岸锋 冷流暴雪 对流有效位能 对流云带 

分 类 号：P426.634[天文地球—大气科学及气象学]