2007年3月4～5日黑龙江省暴雪天气过程诊断分析

本文在分析大气环流及物理量场特征基础上，结合卫星云图资料对2007年3月4～5日黑龙江东南部地区一次暴霄天气过程成因进行了探讨，发现本次暴雪出现在强烈上升的饱和湿区，水汽主要来自于低层输入，是高空南北锋区合并、低空暖式切变、地面低压人海加强东移北上等高低空系统相互作用的结果，同时分析还表明本次暴雪过程也具有中小尺度特征。

Diagnostic Analysis of Heavy Sonwstorm in Heilongjiang Province

Based on analysis of characteristics of atmospheric circulation and physical quantity fields on each layer, as well as hourly satelliteimages.the causes of a heavy snowstorm process in the region of southeast HeiLongJiang from 3to 4 March in 2007 was studied.Results showed that heavy snowstorm event resulted from upper frontal zones combined, lower warm shearline, ground low vortex developed and moved eastward to the north. After analyzing transportation of water vapor,distribution of vertical velocity, we found that the snowstorm process was in the area of strong ascending motion with moist air, and vapour transport comes primarily from the low layer.The study also revealed the fact that meso-microscale system was active in the heavy snowstorm process.