陕西一次持续性大雾天气特征分析  

Weather Characteristics Analysis of a Continuously Heavy Fog Process in Shaanxi Province

作　　者：刘瑞芳[1] 陈小婷[1] 屈丽玮[1] 

机构地区：[1]陕西省气象台,陕西西安710014

出　　处：《安徽农业科学》2016年第2期231-233,共3页Journal of Anhui Agricultural Sciences

摘　　要：利用常规探测资料、自动站资料,对陕西2007年11月12~16日大范围持续性大雾产生的天气背景、温湿条件和大气层结等特征进行分析。结果表明,前期500 h Pa陕西为西西北气流,地面为均压场控制,辐射降温有利于近地层水汽凝结成雾;后期陕西处于高压前部等压线较密集区,形成锋前雾;1~4 m/s的地面风速、低层弱的垂直速度是这次雾形成的动力条件;上干下湿的高低空配置是大雾发生的水汽条件;大气层结稳定,低层有逆温、稳定少动的暖盖,阻碍低层水汽向上扩散,有利于大雾发生。Based on the conventionally observational data and automatic weather station data, the synoptic background, temperature and humidi- ty conditions, atmospheric stratification feature of a wide area of continuously heavy fog event in Shaanxi Province during November 12 - 17th 2007 were analyzed. The main conclusions were as follows： the 500 hPa circulation at mid-latitude was northwest flow, and the ground was con- trolled by the equal pressure filed, which were favorable for the radiation fog; late Shaanxi was in the isobar dense area of the high-pressure, which formed the front fog; 1 -4 m/s surface wind and weak vertical movement in lower level were the dynamical conditions of the fog weather; the comqgurations of big relative humidity at lower level and small relative humidity at middle level constituted water vapor condition of the fog; s/able atmospheric stratification and the lower temperature inversion, hindered the low-level moisture diffusion upward, were conducive for the oceurrence of the log.

关 键 词：大雾 环流形势 温湿条件 探空资料 

分 类 号：S161.5[农业科学—农业气象学]