2008年1月三次低温连阴雪天气异同分析  

Analysis of Differences and Similarities of Three Long-lasting Cryogenic Snow Weather in January 2008

作　　者：张成军 穆建华 范小明 杨文海 

机构地区：[1]宁夏固原市气象台,宁夏固原756000 [2]宁夏气象台,宁夏银川750002

出　　处：《安徽农业科学》2011年第18期10962-10963,11034,共3页Journal of Anhui Agricultural Sciences

摘　　要：为深入了解2008年1月发生在宁夏南部山区3次低温连阴雪天气的异同点,采用诊断分析方法,从连阴雪天气形势、地面系统降雪部位、水汽分布特点等方面对3次降雪进行对比分析。结果表明,3次降雪发生时,天气系统均深厚,北方冷空气和高原南支槽前湿空气有效配合,比湿中心呈3种分布型,1 g/kg等比湿线基本以40°N为界,北干南湿,降雪区处于比湿1～3 g/kg的高梯度区内,且有5种地面降雪位置,即冷锋前倒槽东侧偏南气流降雪、冷锋锋区降雪、锋后降雪、回流降雪和远离冷锋的高压内降雪。To better understanding the similarities and differences of three long-lasting cryogenic snow weather which happened in the South Re- giun of Ning^ia in January 2008,the weather situation, snow parts of the ground system and water vapor distribution in long-lasting eryogenie snow weather were comparatively analyzed with the diagnostic method. The results showed that the weather systems were deep, the coordination be- tween the north cold air and the moist air of southern branch trough were effective. Specific humidity showed three distribution patterns, the 40 degrees north latitude were basically as the boundary of the 1 g/kg geometric wet line, north of dry and south of wet, the snow area were in the high gradient region of specific humidity 1 -3 g/kg. And snow happened in 5 positions of the ground system, such as snowing in southerly flow of the inverted trough east before the cold front, snowing in the cold fi＇ont, snowing after the cold front, snowing in the easterly winds return and snowin~ in the zround high- pressure system away from the cold front.

关 键 词：连阴雪 天气形势 水汽分布 降雪部位 

分 类 号：P468.025[天文地球—大气科学及气象学]