Abstract:

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 PM10 and PM2.5 were 237.3±268.3 and 89.3±82.3 μg·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 250-450 μg·m^-3；The main contribution source areas in winter were similar to that in autumn， and the contribution levels were 150-300 μg·m^-3； The main contribution source areas in winter were similar to that in autumn， and the contribution levels were 150-300 μg·m^-3；In spring， the main contribution source areas were located in the Taklimakan Desert in southern Xinjiang， and the concentration contribution levels were 250-500 μg·m^-3；The main contribution source areas in summer were similar to that in spring， and the contribution levels were 150-250 μg·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.}

Key words: PM₁₀, cluster analysis, potential source contribution, concentration-weighted trajectory, Kashgar