阜阳市雾日气候特征及变化趋势分析

Analysis of climatic characteristics and trends of fog days in Fuyang City

利用阜阳市6个气象观测站1960-2009年的观测资料,统计分析了近50 a阜阳市雾日的气候变化特征。结果表明,阜阳市年平均雾日总体呈现出东多西少,近50 a雾日呈现出明显上升的趋势;大雾天气主要集中在冷季(10月至次年3月);大雾开始的主要时段在凌晨3时至早上8时,大雾消散的主要时段在9时前后,持续时间在3 h以内的大雾最多;适当的气温、相对湿度和风速有利于大雾的产生;气候变暖背景下,气温的上升在冷季有利于雾日增多,暖季(4-9月)则反之,同时雾日的年代际变化趋势与气温有很好的一致性,而雾日的年际变化则与相对湿度的变化更为一致。

Climatic change characteristics of fog days were analyzed based on the observation data from 6meteorological stations in Fuyang during 1960-2009.Results show that,fog days occur more frequently in the east part than in the west part;fog days increased obviously in the past 50 years;the number of fog days occur most in the cold season(October to next March);fogs occur frequently at 03:00 to 07:00,and dissipate generally at about09:00;the duration of most fog is within 3 hours;the appropriate temperature,relative humidity and wind speed benefit the fog formation;with climate warming,the fog days rise during the cold season,and the trend of change is opposite in the warm season(April to September);decadal trend of fog days and air temperature has a good consistency,with the inter-annual variability of fog days and relative humidity being consistent.