【摘要】 利用1961-2006年湖南省97个市(县)地面气象观测资料,分析了霾现象的变化特征,结果表明:20世纪70年代以来,湖南年霾日急剧增多,极值不断被刷新,强度增强,重度霾出现范围增大。统计分析表明:46a来湖南年平均风速线性减小,年降水日数波动性减少,年平均日最小相对湿度≤70%的日数增多。气候变化、城市化进程加快、大气污染物排放量增加是引起霾出现频率增加的可能原因。更多还原

【Abstract】 Based on the surface meteorological data at 97 stations of Hunan Province during 1961-2006,climatic characteristics of the weather phenomenon of haze were analyzed. Results show that,since the 1970s,haze days has increased quickly,its extremum has been renewed more frequently,the intensity of haze is strengthening and the area of heavy haze is widening. In the last 46 years,the annual average wind speed in Hunan Province declined linearly,the yearly total rain days decreased wavely,the days with relative humidity ≤ 70% increased. Climate change,speedup of urbanization and the increase in air pollutant are likely the basic causes of more haze phenomena.更多还原