干旱区生态环境知识资源中心(Arid): Temporal variations in aerosol composition at Lanzhou City, Northwestern China

Arid

DOI	10.3724/SP.J.1226.2011.00252
	Temporal variations in aerosol composition at Lanzhou City, Northwestern China
	She, Feng; Cheng, YiFan; Wang, ShiGong; Guo, YongTao; Wang, JinYan; Ma, MinJing; Shang, KeZheng
通讯作者	Wang, SG
来源期刊	SCIENCES IN COLD AND ARID REGIONS
ISSN	1674-3822
出版年	2011
卷号	3 期号:3 页码:252-263
英文摘要	Although Lanzhou is one of the most heavily polluted cities in China, the composition of its air pollutants have not yet been studied in detail. The data of four months on the concentrations and compositions of ions from daily air-filter samples in the winter and spring during 2007-2008 were analyzed to investigate temporal trends and their possible causes. The results indicate that mean concentrations of almost all the aerosol components are greater in winter than in spring due to stronger emissions in winter and weaker localized dispersion. Spring dust storms are the major cause of the highest peak PM10 concentrations recorded during the study period; however, these elevated levels were transient. Ion concentrations related to coal combustion show the greatest reduction from winter to spring, while the concentrations of strong crustal components show a less-pronounced reduction. Strong cycles in the levels of particulate matter (PM) and all ions are also observed during the winter months due to meteorological conditions. Depending on the season, nine different ions accounted for 20%-50% of the PM concentration. The particle size of polluting ions was constant at times of increasing PM concentrations (particularly during winter), whereas the particle size of crustal ions increased dramatically during spring dust storms. Local meteorological conditions (especially wind speed) have a strong influence on the levels of pollutants. Four dust storms were noted, including one during winter. In summary, the regional transport of desert dust from the Gobi can significantly affect air quality and the chemical composition of aerosols in Lanzhou. The dust storms can strongly increase concentration of crustal ions, which are characteristics of deserts in northwestern China. This observation is in agreement with back-trajectories, which show reduced levels of pollutant ions during dust storms. Data on nitrate: sulfate ratios indicate that stationary point sources are the main source of ions rather than mobile sources.
英文关键词	dust storm ions Lanzhou City PM10 PM2.5
类型	Article
语种	英语
收录类别	ESCI
WOS记录号	WOS:000422285100008
WOS关键词	PARTICULATE AIR-POLLUTION ; WATER-SOLUBLE COMPONENTS ; PM10 AEROSOLS ; PM2.5 ; VISIBILITY ; DUST ; PARTICLES ; MORTALITY ; EMISSION ; TSP
WOS类目	Geography, Physical
WOS研究方向	Physical Geography
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/329835
作者单位	[She, Feng; Cheng, YiFan; Wang, ShiGong; Guo, YongTao; Wang, JinYan; Ma, MinJing; Shang, KeZheng] Lanzhou Univ, Coll Atmospher Sci, Key Lab Semi Arid Climate Change, Minist Educ, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	She, Feng,Cheng, YiFan,Wang, ShiGong,et al. Temporal variations in aerosol composition at Lanzhou City, Northwestern China[J]. 兰州大学,2011,3(3):252-263.
APA	She, Feng.,Cheng, YiFan.,Wang, ShiGong.,Guo, YongTao.,Wang, JinYan.,...&Shang, KeZheng.(2011).Temporal variations in aerosol composition at Lanzhou City, Northwestern China.SCIENCES IN COLD AND ARID REGIONS,3(3),252-263.
MLA	She, Feng,et al."Temporal variations in aerosol composition at Lanzhou City, Northwestern China".SCIENCES IN COLD AND ARID REGIONS 3.3(2011):252-263.