浮尘天气过程对四川省空气质量的影响

摘要

The analysis of meteorological characteristics, transmission path characteristics, change characteristics of air quality of dust weather were done using dust weather yearbooks and automatic ambient air monitoring data. The results showed that dust weather of Sichuan was mainly affected by the cold dust weather from northwest in Xinjiang and Gansu. Dust led a substantial increase to PM10 concentration of Sichuan, especially in northeastern and southern Sichuan. Dust weather must be accompanied by north airflow power, which will lead other gaseous pollutant concentration to decrease. One path of the dust into the basin was as follow:dust enter into Sichuan from Longnan, transporting from north to south by Guangyuan, Mianyang, Deyang, Chengdu, Leshan, Ya’an. Another path was as follow:dust enter into Sichuan from Longnan and Hanzhong, overlaying many cities from south to north. Meanwhile, it had an impact on northeastern cities such as Bazhong, Dazhou, Nanchong, Suining.%利用沙尘天气年鉴资料和环境空气自动监测数据，分析沙尘天气的气象特征及传输路径和空气质量变化特征。结果显示：四川浮尘天气污染主要受来自西北方向新疆、甘肃冷空气沙尘天气影响，浮尘导致四川盆地PM10颗粒物浓度大幅增加，尤其对川东北和川南地区贡献较大。沙尘天气必然伴随北方气流动力，会导致其他气态污染物浓度有所降低。浮尘进入盆地路径一种是以经陇南入川为主，浮尘输送由北到南，经广元、绵阳、德阳、成都、乐山、雅安向南输送；另外一种经陇南、汉中以覆盖式由南向北影响城市，同时对川东北巴中、达州、南充、遂宁有一定影响。