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	Chemical characteristics of PM2.5 during a typical haze episode in Guangzhou
	Tan Jihua ; Duan Jingchun ; He Kebin ; Ma Yongliang ; Duan Fengkui ; Chen Yuan ; Fu Jiamo
	2010-10-12 ; 2010-10-12
关键词	PM2.5 haze episode water-soluble inorganic ions organic carbon elemental carbon Guangzhou RIVER DELTA REGION ORGANIC AEROSOL CARBONACEOUS AEROSOL DESCRIPTIVE ANALYSIS SEASONAL-VARIATIONS PARTICULATE MATTER ELEMENTAL CARBON BLACK CARBON CHINA VISIBILITY Environmental Sciences
中文摘要	The chemical characteristics (water-soluble ions and carbonaceous species) Of PM2.5 in Guangzhou were measured during a typical haze episode. Most of the chemical species in PM2.5 showed significant difference between normal and haze days. The highest contributors to PM2.5 were organic carbon (OC), nitrate, and sulfate in haze days and were OC, sulfate, and elemental carbon (EC) in normal days. The concentrations of secondary species such as, NO3-, SO42-, and NH4+ in haze days were 6.5, 3.9, and 5.3 times higher than those in normal days, respectively, while primary species (EC, Ca2+, K+) show similar increase from normal to haze days by a factor about 2.2-2.4. OC/EC ratio ranged from 2.8 to 6.2 with an average of 4.7 and the estimation on a minimum OC/EC ratio showed that SOC (secondary organic carbon) accounted more than 36.6% for the total organic carbon in haze days. The significantly increase in the secondary species (SOC, NO3-, SO42-, and NH4+), especially in NO3-, caused the worst air quality in this region. Simultaneously, the result illustrated that the serious air pollution in haze episodes was strongly correlated with the meteorological conditions. During the sampling periods, air pollution and visibility had a good relationship with the air mass transport distance; the shorter air masses transport distance, the worse air quality and visibility in Guangzhou, indicating the strong domination of local sources contributing to haze formation. High concentration of the secondary aerosol in haze episodes was likely due to the higher oxidation rates of sulfur and nitrogen species.
语种	英语 ; 英语
出版者	SCIENCE PRESS ; BEIJING ; 16 DONGHUANGCHENGGEN NORTH ST, BEIJING 100717, PEOPLES R CHINA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/79776]
专题	清华大学
推荐引用方式 GB/T 7714	Tan Jihua,Duan Jingchun,He Kebin,et al. Chemical characteristics of PM2.5 during a typical haze episode in Guangzhou[J],2010, 2010.
APA	Tan Jihua.,Duan Jingchun.,He Kebin.,Ma Yongliang.,Duan Fengkui.,...&Fu Jiamo.(2010).Chemical characteristics of PM2.5 during a typical haze episode in Guangzhou..
MLA	Tan Jihua,et al."Chemical characteristics of PM2.5 during a typical haze episode in Guangzhou".(2010).

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