黔东南大雾气候特征

Climate Characteristics of Heavy Fogs in Southeastern Guizhou

利用1961-2007年黔东南州16个地面气象观测站逐日大雾日数资料,对黔东南州大雾日数的日、年、季分布特点、长期变化趋势、年代际的变化特征等进行分析。结果表明：20世纪60年代平均雾日最多,80年代最少,进入21世纪后具有逐渐增多的趋势;以秋季雾日最多,冬季次之,春季最少;以11月为最多,2月为最少。并且大雾日数有准40年的周期,在大雾多发期存在着准5年的周期性。大雾主要分布在黔东南州的中部,东南部和西北部相对较少。

With the daily fog data of 16 weather stations in Southeast Guizhou from 1961 to 2007,a detailed analysis is made of the daily,seasonal,annual,and inter-decade variation characteristics and long-term trends of fog distribution over Southeast Guizhou.It is concluded that the maximum number of foggy days averagely occurred in the 1960s,and minimum in the 1980s,with an increasing trend after 2000;the greatest number of foggy days are found in autumn and the least in spring,the greatest in November and the least in February;there is a quasi-40 year period and a quasi-5 year period in the variation of the number of heavy fog days;heavy fog weather occurred most frequently around the central part of Southeast Guizhou and relatively less in the southeast and northwest parts of Southeast Guizhou.