北方沙尘对四川盆地环境空气质量影响和特征分析

Effects and Characteristics of Floating Dust Weather on Air Quality in Sichuan Basin

利用沙尘天气资料和颗粒物浓度、激光雷达监测数据以及后向轨迹,分析浮尘天气的气象特征及传输路径,构建了浮尘天气对四川盆地各城市大气环境质量影响的量化指标,并利用该量化指标分析了浮尘天气对四川盆地各城市大气环境的影响,得出2013—2015年浮尘对四川盆地PM_(10)年均质量浓度的贡献,2013—2015年约为4.82、1.00、0.56μg/m^3;浮尘对PM_(10)年均质量浓度的贡献川西区域最大,川东北区域次之,川中区域最小,其贡献量分别为3.5、2.2、1.4μg/m^3。同时还进一步分析浮尘对区域PM_(10)影响差异的原因。

Based on the data of sandstorm weather,laser radar system observed particulate matter concentration and backward trajectory,this study analyzed the meteorology characteristics and transmission paths of floating dust weather,defined the quantitative index,which were then used to analyze the effects of floating dust weather on ambient air quality of local cities in Sichuan. The results showed that the contribution rate of the floating dust effect on PM10 annual average concentration in Sichuan basin was 4. 82 μg / m^3 in 2013,1. 00 μg / m^3 in 2014 and 0. 56 μg / m^3 in 2015. The contribution rate of the floating dust effect was maximum in western Sichuan basin and then in the northeast,minimum in middle Sichuan basin,which was3. 5 μg / m^3,2. 2 μg /m^3 and 1. 4 μg / m^3 respectively. Moreover,the difference of impacts in each region of Sichuan basin was analyzed.