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	Characteristics of Carbonaceous Species in PM2.5 in Wanzhou in the Hinterland of the Three Gorges Reservior of Northeast Chongqing, China
	Zhang, Liuyi1; Huang, Yimin1; Liu, Yuan2; Yang, Fumo1,2; Lan, Guoxin1; Fu, Chuan1; Wang, Jun1
	2015
摘要	Daily PM2.5 samples were collected in the four consecutive seasons in 2013 in Wanzhou, the second largest city in Chongqing Municipality of China and in the hinterland of the Three Gorges Reservior on Yangtze River and analyzed for the mass concentrations and carbonaceous species of PM2.5 to investigate the abundance and seasonal characteristics of PM2.5, and organic carbon (OC) and elemental carbon (EC). The annual average PM2.5 concentrations were 125.3 mu g center dot m(-3), while OC and EC were 23.6 mu g center dot m(-3) and 8.7 mu g center dot m(-3), respectively. The total carbonaceous aerosol (TCA) accounted for 32.6% of the PM2.5 mass. On seasonal average, the OC and EC concentrations ranked in the order of winter > fall > spring > summer, which could be attributed to the combined effects of changes in local emissions and seasonal meteorological conditions. Strong OC-EC correlations were found in the winter and fall, suggesting the contributions of similar sources. The lowest OC-EC correlation occurred in the summer, probably due to the increases in biogenic emission and formation of secondary organic aerosol (SOA) through photochemical activity. Average secondary organic carbon (SOC) concentration was 9.0 mu g center dot m(-3), accounting for 32.3% of the total OC. The average ratios of SOA/PM2.5 of 3.8%~15.7% indicated that SOA was a minor fraction in fine particles of Wanzhou.
DOI	10.3390/atmos6040534
URL	查看原文
发表期刊	ATMOSPHERE
ISSN	2073-4433
卷号	6期号:4页码:534-546
通讯作者	Yang, FM (reprint author), Chongqing Three Gorges Univ, Key Lab Water Environm Evolut & Pollut Control Th, Wanzhou 404100, Peoples R China.
收录类别	SCI
WOS记录号	WOS:000353725200008
语种	英语