Recharge sources and potential source areas of atmospheric PM2.5 in Xinjiang
Received date: 2022-09-28
Revised date: 2022-11-29
Online published: 2023-06-21
Using the air pollutant mass concentration data in Xinjiang from March 2021 to February 2022, the evolution characteristics of PM2.5 concentration and its potential contribution source area were analyzed. The results showed that: (1) The concentration of PM2.5 in Xinjiang was significantly high, especially in winter, the average was as high as 86.16 μg·m-3, which had certain potential risks to human health. Influenced by the near-surface air stability, the PM2.5 concentration was higher at nighttime and lower in the daytime, but supplemented by (similar) valley winds, the PM2.5 concentration exhibited a significant double-peak pattern in the Hami Basin and the Tarim Basin. (2) The PM2.5 in the economic belt of the northern slope of the Tianshan Mountains was mainly dominated by the emission from the surrounding oil and gas fields and the dust from strong winds during the transportation process, while the source of PM2.5 in other areas, where human activities were relatively weak, was mainly controlled by the dust from strong winds, supplemented by the combustion of oil and natural gas. (3) The overall low concentration of PM2.5 in each path in the source region of the Irtysh River indicates that the impact of pollutants on environmental quality could be ignored. The high concentration of PM2.5 in the NB area was mainly affected by the local atmospheric circulation, but the airflow passing through the oil and gas industry area was a key factor leading to the formation of haze and floating dust weather. Although there are differences in the material supply paths between the Hami Basin and the Tarim Basin, their PM2.5 potential contribution source areas were all mainly distributed in the Kongqi River Basin and Lop Nur on the eastern edge of the Taklimakan Desert. (4) Exogenous airflow evolved into convergent/divergent airflow due to the topography of the basin, supplemented by (quasi) valley winds to promote the mixing of pollutants, which could be the key factor for the similar evolution trend of PM2.5 in the economic belt of the northern slope of the Tianshan Mountains and Tarim Basin.
Junli XU , Haidong HAN , Jian WANG . Recharge sources and potential source areas of atmospheric PM2.5 in Xinjiang[J]. Arid Zone Research, 2023 , 40(6) : 874 -884 . DOI: 10.13866/j.azr.2023.06.03
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