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Journal of Arid Land  2018, Vol. 10 Issue (5): 686-700    DOI: 10.1007/s40333-018-0096-9
Orginal Article     
Characteristics of air pollution events over Hotan Prefecture at the southwestern edge of Taklimakan Desert, China
Jingxin LI1, Shigong WANG2,3,*(), Jinhua CHU3,4, Jiaxin WANG2, Xu LI3, Man YUE3, Kezheng SHANG3
1 State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China
2Sichuan Key Laboratory of Plateau Atmosphere and Environment, College of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China
3Gansu Key Laboratory of Arid Climate Change and Reducing Disaster, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China
4Chongqing Meteorological Bureau, Chongqing 401147, China
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Hotan Prefecture is located at the southwestern edge of Taklimakan Desert,the world's largest shifting sand desert, of China. The desert is one of the main sources for frequent sand-dust weather events whichstrongly affectthe air quality of Hotan Prefecture.Although this region is characterized by the highest annual mean PM10 concentration values that are routinely recorded by environmental monitoring stations across China, both this phenomenon and its underlying causes have not been adequately addressed in previous researches. Reliable pollutant PM10 data are currently retrieved using a tapered element oscillating microbalance (TEOM) 1400a, a direct real-time monitor, while additional concentration values including for PM2.5, sulfur dioxide (SO2), nitrogen dioxide (NO2), carbon monoxide (CO) and ozone (O3) have been collected in recent years by the Hotan Environmental Monitoring Station. Based on these data, this paper presents a comparison of the influences of different kinds of sand-dust weather events on PM10 (or PM2.5) as well as the concentrations of other gaseous pollutants in Hotan Prefecture. It is revealed that the highest monthly average PM10 concentrations are observed in the spring because of the frequent occurrence of three distinct kinds of sand-dust weather events at this time, including dust storms, blowing dust and floating dust. The floating dust makes the most significant contribution to PM10 (or PM2.5)concentration in this region, a result that differs from eastern Chinese cities where the heaviest PM10 pollution occurs usually in winter and air pollution results from the excess emission of local anthropogenic pollutants. It is also shown that PM10 concentration varies within typical dust storms. PM10 concentrations vary among 20 dust storm events within Hotan Prefecture, and the hourly mean concentrations tend to sharply increase initially then slowly decreasing over time. Data collected from cities in eastern China show the opposite with the hourly mean PM10 (or PM2.5)concentration tending to slowly increase then sharply decrease during heavy air pollution due to the excess emission of local anthropogenic pollutants. It is also found that the concentration of gaseous pollutants during sand-dust weather events tends to be lower than those cases under clear sky conditions. This indicates that these dust events effectively remove and rapidly diffuse gaseous pollutants. The analysis also shows that the concentration of SO2 decreases gradually at the onset of all three kinds of sand-dust weather events because of rapidly increasing wind velocity and the development of favorable atmospheric conditions for diffusion. In contrast, changes in O3 and NO2 concentrations conformed to the opposite pattern during all three kinds of sand-dust weather events within this region, implying the inter transformation of these gas species during these events.

Key wordsPM10 (or PM2.5)concentration      sand-dust weather events      gaseous pollutants      air pollution      Taklimakan Desert     
Received: 20 October 2017      Published: 10 October 2018
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Cite this article:

Jingxin LI, Shigong WANG, Jinhua CHU, Jiaxin WANG, Xu LI, Man YUE, Kezheng SHANG. Characteristics of air pollution events over Hotan Prefecture at the southwestern edge of Taklimakan Desert, China. Journal of Arid Land, 2018, 10(5): 686-700.

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