干旱区生态环境知识资源中心(Arid): Characteristics of air pollution events over Hotan Prefecture at the southwestern edge of Taklimakan Desert, China

Arid

	Characteristics of air pollution events over Hotan Prefecture at the southwestern edge of Taklimakan Desert, China
	Li Jingxin; Wang Shigong; Chu Jinhua; Wang Jiaxin; Li Xu; Yue Man; Shang Kezheng
来源期刊	Journal of Arid Land
ISSN	1674-6767
出版年	2018
卷号	10 期号:5 页码:686-700
英文摘要	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 which strongly affect the air quality of Hotan Prefecture. Although this region is characterized by the highest annual mean PM_(10) 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 PM_(10) data are currently retrieved using a tapered element oscillating microbalance (TEOM) 1400a, a direct real-time monitor, while additional concentration values including for PM_(2.5), sulfur dioxide (SO_2), nitrogen dioxide (NO_2), carbon monoxide (CO) and ozone (O_3) 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 PM_(10) (or PM_(2.5)) as well as the concentrations of other gaseous pollutants in Hotan Prefecture. It is revealed that the highest monthly average PM_(10) 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 PM_(10) (or PM_(2.5)) concentration in this region, a result that differs from eastern Chinese cities where the heaviest PM_(10) pollution occurs usually in winter and air pollution results from the excess emission of local anthropogenic pollutants. It is also shown that PM_(10) concentration varies within typical dust storms. PM_(10) 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 PM_(10) (or PM_(2.5)) 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 SO_2 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 O_3 and NO_2 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.
英文关键词	PM10 (or PM2.5) concentration sand-dust weather events gaseous pollutants air pollution Taklimakan Desert
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	CSCD
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:6353570
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/336021
作者单位	Li Jingxin, Chinese Academy of Meteorological Sciences, State Key Laboratory of Severe Weather, Beijing 100081, China.; Wang Shigong, College of Atmospheric Sciences, Chengdu University of Information Technology;;College of Atmospheric Sciences, Lanzhou University, Sichuan Key Laboratory of Plateau Atmosphere and Environment;;Gansu Key Laboratory of Arid Climate Change and Reducing Disaster, Chengdu;;Lanzhou, ;; 610225;;730000.; Chu Jinhua, College of Atmospheric Sciences, Lanzhou University;;Chongqing Meteorological Bureau, Gansu Key Laboratory of Arid Climate Change and Reducing Disaster;;, Lanzhou;;, ;;Chongqing 730000;;401147.; Wang Jiaxin, College of Atmospheric Sciences, Chengdu University of Information Technology, Sichuan Key Laboratory of Plateau Atmosphere and Environment, Chengdu, Sichuan 610225, China.; Li Xu, College of Atmospheric Sciences, Lanzhou University, Gansu Key Laboratory of Arid Climate Change and Reducing Disaster, Lanzhou, Gansu 730000, China.; Yue Man, College of Atmospheric Sci...
推荐引用方式 GB/T 7714	Li Jingxin,Wang Shigong,Chu Jinhua,et al. Characteristics of air pollution events over Hotan Prefecture at the southwestern edge of Taklimakan Desert, China[J],2018,10(5):686-700.
APA	Li Jingxin.,Wang Shigong.,Chu Jinhua.,Wang Jiaxin.,Li Xu.,...&Shang Kezheng.(2018).Characteristics of air pollution events over Hotan Prefecture at the southwestern edge of Taklimakan Desert, China.Journal of Arid Land,10(5),686-700.
MLA	Li Jingxin,et al."Characteristics of air pollution events over Hotan Prefecture at the southwestern edge of Taklimakan Desert, China".Journal of Arid Land 10.5(2018):686-700.