摘要
2007年3月3～5日,辽宁大部分地区普降大到暴雪。本文对此次暴雪过程及其成因进行了初步分析,通过对各种资料,包括营口多普勒雷达资料的分析,认为500hPa南北支槽合并带来的强冷暖空气交汇及北上低涡的发展是产生暴雪天气的主要背景;地面气旋北上带来的南来倒槽是产生暴雪的天气特征;低空急流输送水汽和低层上升运动是增强降雪强度的有利条件,这一分析结果对预报暴雪天气具有指示意义。
The satellite,radar and NCEP data are used to analyze an unusual snowstorm over Liaoning Province during 3-5 March 2007. The analysis shows that the combination of south and north troughs at 500 hPa,the northbound vortex at 850 hPa and the cyclone at the surface are very favorable to the occurrence of snowstorm. The intense low level jets and ascending motion at 850 hPa are in favor of the moisture transportation and the intensification of snow. The low level jets and the convergence of wind may be considered as triggering mechanism for the snowstorm.
出处
《大气科学》
CSCD
北大核心
2009年第2期275-284,共10页
Chinese Journal of Atmospheric Sciences
基金
国家自然科学基金资助项目40605016
关键词
暴雪
低涡
槽
snowstorm,vortex,trough
