Study on the spatio-temporal variation of atmospheric particulate pollution and its dust components in Xinjiang,northwest China
Based on the environmental monitoring and meteorological observation data of Xinjiang,northwest China from 2020 to 2022,combined with the HYSPLIT and PM2.5/PM10 ratio model,we studied the characteristics of spatio-temporal variation of atmospheric particulates,and analyzed the major transport pathways,potential source areas of dust storms as well as the dust contribution.Statistical analysis showed that the monthly average PM2.5 and PM10 concentrations presented a wavy distribution with the peak value appearing from December to March and the lowest value occurring from June to August.The spatial distribution of PM2.5 and PM10 appeared a south-north gradient from high to low.The annual average PM2.5 and PM10 concentrations in the southern Xinjiang varied from 42 to 111 μg/m3 and 151 to 367μg/m3,which were relatively lower in the northern and eastern Xinjiang,ranging from 10 to 62μg/m3,21 to 110μg/m3 and 28 to 50μg/m3,100 to 145μg/m3,respectively.The annual average PM2.5 and PM10 concentrations in 69％of the cities in Xinjiang exceeded the second-level concentration limit of the national ambient air quality standards.There was a significant positive correlation between urban atmospheric PM2.5 and PM10 concentrations(R2=0.84).PM10 pollution dominated in spring,summer and autumn,and PM2.5 pollution prevails in winter.PM10 was the main air pollutant that significantly influenced regional air quality in Xinjiang.The contribution rate of PM10 in AQI was 65％～96％in the southern Xinjiang,followed by the eastern Xinjiang and northern Xinjiang with 58％～65％and 3％～41％,respectively.Serious atmospheric PM10 pollution mainly happened in spring,and the proportion of air pollution caused by PM10 was above 50％in the southern Xinjiang.The major source of dust storms disaster in Xinjiang was the Taklimakan Desert.There were significant differences in dust transport pathways,in which the high-altitude transport was mainly from the desert hinterland,while the low-altitude transport source was mostly in the eastern of the desert.The contribution rate of wind erosion dust to atmospheric PM10 and PM2.5 concentration was 85％and 66％,respectively.
XinjiangPM2.5PM10spatio-temporal variationdust componentsair qualitynumerical model
万方数据
维普
