摘要
为了了解近20 a郑州市大雾的时空变化特征,根据1980-2005年郑州市大雾观测记录,统计分析了这一时期郑州市大雾的变化特点及产生大雾时的气象要素特征;并利用河南省地面和探空观测资料以及NCEP1°×1°再分析资料,从要素场、大气稳定度等方面,对2007年12月25-27日郑州市大雾形成原因进行了分析。结果表明:郑州市年雾日数呈下降趋势,每月都可以出现大雾,但12月最多,6月最少。降水后较大的相对湿度、稳定的大气层结以及近地层较小风速等是大雾形成的必要条件。
In order to find out the temporal and spatial variation characteristics of heavy fog in recent 20 years in Zhengzhou, the heavy fog variation characteristics and the meteorological factor characteristics when heavy fog occurred are statistically analyzed on the basis of the heave fog observational data from 1980 to 2005 in Zhengzhou. By using the surface and sounding observational data and NCEP 1°×1° reanalysis data, the formation reason is analyzed for the heavy fog that formed on December 25--27 in Henan from meteorological elements field and atmospheric stability aspects. The results show that the heavy fog days decrease continuously and that it can appear in every month but the most in December and the least in June. The necessary conditions for the formation of heavy fog are the biggish relative humidity after precipitation, the steady atmospheric stratification and smaller wind speed.
出处
《气象与环境科学》
2009年第4期40-43,共4页
Meteorological and Environmental Sciences
关键词
大雾
气候特征
个例分析
heavy fog
climatic characteristic
case analysis
