喀什地区PM_(10)输送路径及潜在源区

Transport pathways and potential source regions of PM in Kashgar,Xinjiang,China

基于HYSPLIT模型和2019年9月至2020年8月喀什地区大气颗粒物逐时数据,利用聚类分析、潜在源贡献因子法(PSCF)和浓度权重轨迹法(CWT)分析喀什地区四季PM10传输路径与潜在源区,揭示研究期间喀什地区不同季节PM10的潜在源分布及其贡献水平。结果表明:喀什地区PM_(10)、PM_(2.5)年均值分别为237.3±268.3、89.3±82.3μg·m^(-3),大气颗粒物以PM10为主;喀什地区气流输送路径主要来自中亚西风气流,其次是来自中国新疆南部;PM10秋季主要贡献源区分布在中亚部分地区以及中国新疆南部区域,贡献水平为250—450μg·m^(-3);冬季主要贡献源区与秋季相似,贡献水平为150—300μg·m^(-3);春季重点贡献源区主要分布在新疆南部塔克拉玛干沙漠区域,贡献水平为250—500μg·m^(-3);夏季主要贡献源区与春季相似,贡献水平为150—250μg·m^(-3)。喀什地区重点防范应是塔克拉玛干沙漠沙尘气溶胶的影响,其次是中亚西风气流携带的大气颗粒物远距离输送。

Based on HYSPLIT model and hourly date of atmospheric particulate matters in Kashgar from September 2019 to August 2020,the main transport pathways and potential source regions of PM10 were analyzed by cluster analyses,potential source contribution function(PSCF)and concentration-weight trajectory(CWT),and revealed the potential source distributions and contribution levels of PM10 in different seasons in Kashgar during the study period.This study revealed that the annual mean concentrations of PM_(10)and PM_(2.5)were 237.3±268.3 and 89.3±82.3μg·m^(-3),respectively,indicating that PM10 was the main particulate matters.The westerly airflows in Kashgar mainly came from the westerly airflows from Central Asia,followed by the southern Xinjiang of China.Furthermore,the potential source regions of PM10 were mainly located in some parts of Central Asia and southern Xinjiang of China in autumn,the contribution levels were 250-450μg·m^(-3);The main contribution source areas in winter were similar to that in autumn,and the contribution levels were 150-300μg·m^(-3);The main contribution source areas in winter were similar to that in autumn,and the contribution levels were 150-300μg·m^(-3);In spring,the main contribution source areas were located in the Taklimakan Desert in southern Xinjiang,and the concentration contribution levels were 250-500μg·m^(-3);The main contribution source areas in summer were similar to that in spring,and the contribution levels were 150-250μg·m^(-3);The prevention and control focus were to prevent the impacts of dust aerosol of the Taklimakan Desert,and the second was on the long-rang transportation of atmospheric particulate matters carried by the westerly wind from Central Asia.