黑龙江省春季两次强降雪天气分析

利用NECP 1°×1°再分析资料,针对2006年3月10日和2011年3月13日黑龙江省2次强降雪天气,从环流形势、物理量和影响系统等方面进行了分析。结果表明,2次强降雪天气具有相似的特征,均是在高空槽配合地面蒙古气旋的有利环境条件发生的,低涡切变和辐合区的持续存在提供了动力条件,低空西南急流带来了充沛的水汽输送。物理量分布及冷槽、暖脊等的位置使得2次强降雪落区存在一些差异。

Analysis of Two Heavy Snow Events in Spring in Heilongjiang Province

By using 1 °× 1 ° NCEP reanalysis data, two heavy snow events on Mar. 10, 2006 and Mar. 13, 2011 in Heilongjiang were ana- lyzed from aspects of circular situation, physical quantity and influencing system. The results showed that two heavy snow events have similar characteristics, both were under the upper trough and Mongolia cyclone. Vortex shear and convergence zone persistence provided dynamical condition for the two heavy snow events. The low-level southwest airflow brought sufficient moisture for snow region. Physical quantity distribu- tion and the positions of cold trough, warm ridge caused differences for the two times heavy snow regions.