安徽农业科学2012，Vol.40Issue(32)：15812-15815,15887,5.
辽宁省两次区域性暴雪过程的对比分析
Comparison between the Two Regional Snowstorm Processes in Liaoning
摘要
Abstract
Based on the conventional observation data and reanalysis data (horizontal resolution 1 ° X 1 °) from NCEP, circulation change and physical quantity of the two regional snowstorm processes in Liaoning on between 12th - 13th Feb 2009 and 14th - 15th Mar 2010 were compared. The results showed that many analogies exist between the two processes. Both processes occurred under stable Ural blocking high and the low vortex and trough between 50°N and 60°N. Low-level jet established before the snow provides enough moisture and energy. Relative helicity and vorticity both the processes who show positive values in the lower-level and negative values in the upper-level lead to a coupling of the intense divergence on upper levels and intense convergence on lower levels as well as intensive ascending motion. That is the dynamic mechanism of the heavy snowstorm occurrence. When the southwest airflow on lower levels meets the inrush of arid cold air on upper levels, snowstorm happens. While the lower level is taken over by the cold air, the snow is on the way out. The both processes have humidity frontal zone on the east of liaoning and the frontal zone continuing for a long time play an important role in the heavy snow in the east.关键词
区域暴雪过程/乌拉尔山高压脊/环流形势/对比分析/辽宁省Key words
Regional snowstorm processes/ Ural blocking high pattern/ Circulation pattern/ Comparative analysis/ Liaoning Province分类
农业科技引用本文复制引用
辛艳辉,王宪彬..辽宁省两次区域性暴雪过程的对比分析[J].安徽农业科学,2012,40(32):15812-15815,15887,5.基金项目
中国气象局预报员专项(CMAYBY2011-007) （CMAYBY2011-007）
中国气象局公益性行业专项(GYHY2010-06001). （GYHY2010-06001）
