1970-2005年广西霾的变化特征

Climatic characteristics of haze in Guangxi during 1970—2005

利用1970—2005年广西89个地面气象观测站资料,分析了霾现象的变化特征,结果表明:20世纪90年代后广西年霾日不断上升,21世纪后霾日有急剧上升的趋势,霾的强度不断增强,重度霾日和严重霾日出现范围扩大。统计分析结果表明,36年来广西的年平均风速线性逐渐减小,年降水日数也逐渐减小,年平均日最小相对湿度≤70%的日数增多。气候的变化、城市化进程的加快和大气污染物排放量的增加是引起霾现象频数增加的可能原因。

Based on the ground meteorological observation data at 89 weather stations characteristics of haze variations are analyzed The result indicates that the annual hazy around Guangxi during 1970--2005, days keep on rising in 1990＇s, whose tendency becomes more sharply after 2000, the haze intensity strengthens and the area where heavy and heavier hazy days appear gets wider. Further statistic analysis indicates that in the last 36 years the annual average wind speed in Guangxi declines linearly, the annual rainy days decrease but the days with relative humidity less then 70% increase. So that variations of climate, speedup in urbanization and increase in emission of air pollutant may take important roles in causing more and serious hazy days.