广西轻雾特征分析

Analysis of characteristics of mist in guangxi

利用1961-2013年广西90个地面观测站资料,分析了近年广西轻雾日数的时空变化特征。结果表明:广西常年轻雾日数为125d,呈东多西少分布特征,四季轻雾日数基本持平;1961—2013年广西雾日变化呈显著的增加趋势,平均每年增加3.1d,且在1985年发生了增加的突变;轻雾最多的时间出现在21世纪初。轻雾气候变化发生的原因与广西气温升高、相对湿度和风速减小有密切关系,城镇化发展和人类活动导致排放污染物增加也是可能原因之一。

Based on the observation data from 90 stations in Guangxi during 1961-2013, the spatial and temporal variation characteristics of mist days during recent years in Guangxi. The results show that the number of mist days of Guangxi in normal years is 125 with declining from east to the west and dispersing equally in four seasons; the variation of mist days from 1961 to 2013 appeared a significant increasing trend with increasing 3.1 days on average every years and appearing the increasing mutation in 1985 and mist appearing most at the beginning of the 21st century; The causes of Mist change is closely related to rising temperatures, relative humidity and wind speed decreasing, and the discharge of pollutants led by urbanization and human activity is also one of the possible causes.