河南省北部一次暴雪天气过程诊断分析  

Diagnostic Analysis on a Snowstorm Weather Process in North of Henan Province

作　　者：孙仲毅 王军 靳冰凌 邢用书 芦阿咪 孙日丁 黄真文 

机构地区：[1]河南省鹤壁市气象局,河南鹤壁458030

出　　处：《高原气象》2010年第5期1338-1344,共7页Plateau Meteorology

摘　　要：利用常规观测资料和FY-2C射出长波辐射资料,采用物理量诊断分析方法,对2009年11月10-12日出现在河南省北部的暴雪过程进行了综合分析。结果表明：（1）在稳定的环流背景下,低空急流、地面河套倒槽与回流形势同时强烈发展,造成持续性暴雪天气。（2）物理量诊断结果显示,深厚的湿层和持续的水汽辐合为暴雪的产生提供了充沛的水汽;中低层辐合、高层辐散垂直结构的持续存在有利于低层垂直上升运动的持续加强,从而触发不稳定能量不断释放;中低层正涡度、中高层负涡度结构的稳定维持,为强降雪天气提供了动力条件;冷暖空气稳定对峙是造成暴雪持续、增幅的重要原因之一。（3）OLR特征分析表明,OLR6 h低值中心与6 h最大降雪中心密切相关。Based on the conventional observation data and OLR data of FY-2C satellite,a snowstorm event occurred in north of Henan Province on 10-12 November 2009 is comprehensively analyzed by physical diagnosis.The results show that：（1） Under the stable circulation background,the low level jet developed strongly with surface invert trough over Hetao area and the reflux weather situation at the same time,which resulted in sustained snowstorm weather.（2） The physical diagnosis results show that the deep moisture layer and the sustained water vapor convergence together provide plentiful water for the snowstorm.The persistence and stablity of vertical structure of convergence at low level and the divergence in upper level cause to persist increase of vertical ascending motion,thus triggerring unstable energy to release continually.The structures of positive vorticity at low level and negative vorticity at middle-upper level were continuing stable maintenance to provide dynamic condition for snowstorm.The stable confrontation condition of warm and cold air currents was one of the important reasons that cause snowstorm continuing and increasing.The OLR analysis shows that the 6 h average minimum center of OLR was closely related to the 6 h maximum center of snowfall.

关 键 词：河南省北部 暴雪 散度 涡度平流 温度平流 OLR 

分 类 号：P458[天文地球—大气科学及气象学]