2009年初春黑龙江省大雪成因浅析  

The Causing Analysis of Heavy Snow in Heilongjiang Province in Early-spring 2009

作　　者：任丽[1] 矫玲玲[1] 庞博[1] 杨娃娃[1] 

机构地区：[1]黑龙江省气象台,黑龙江哈尔滨150030

出　　处：《黑龙江气象》2009年第4期3-5,共3页Heilongjiang Meteorology

摘　　要：2009年3月黑龙江省频繁出现雨雪天气,本文利用NCEP再分析资料,对其成因进行了初步分析。研究表明:本次过程发生在大气环流异常的背景下:极涡面积大、强度强;欧亚中高纬地区呈两脊一槽;蒙古气旋较为活跃。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。strong rain and snow process happened in HeiLongJiang Province in March 2009 were analyzed based on NCEP reanalysis data. It shows that longitudinal circulation was very abnormity in the northern hemisphere . The 500 hPa geopetential height field was two ridges and and a trough between them in the middle-high latitudinal Eurasia region. The low level jets and the convergence of wind may be considered as triggering mechanism for the heavy rain and snow.

关 键 词：环流异常 水汽 上升运动 

分 类 号：P458.121.1[天文地球—大气科学及气象学]