重庆市大气能见度变化趋势及影响因子

为了考察大气污染控制举措对能见度的影响，分析了重庆市主城区近15年的观测数据，并用二元相关和偏相关分析了大气能见度与气象因子和空气质量因子之间的关系，结果表明：重庆市能见度的季节变化较为明显，自20世纪80年代以来，能见度呈先下降后上升趋势，风使大气中的污染物和水蒸气迁移和稀释能力增强，从而增大能见度，而相对湿度和降雨量以及大气中TSP、NOx＼SO2浓度的增加又将导致能见度下降。

The Trend of Visibility and Its Affecting Factors in Chongqing

In order to valuate the effect of air pollution countermeasures on visibility , based on the 15 year monitor data in chongqing,this paper analyses the variation trend of visibility. And the inter relationship among visibility , meteorological factors and air quality factors was also discussed by means of bivariate correlation and partial correlation. The results showed that the seasonal and annual variation of visibility is very obvious. The variation trend of visibility was first down and then up since 1980's.Wind speed can increase visibility by accelerating the transportation and dilution of pollutants and vapour; however, the increase of relative humidity, precipitation , TSP,NO X and SO 2 decrease the visibility.