Characteristics and origins of carbonaceous aerosol in the Sichuan   Basin, China

doi:10.1016/j.atmosenv.2014.05.037

CORC > 北京大学 > 环境科学与工程学院

	Characteristics and origins of carbonaceous aerosol in the Sichuan Basin, China
	Chen, Yuan ; Xie, Shaodong ; Luo, Bin ; Zhai, Chongzhi
刊名	大气环境
	2014
关键词	Organic carbon Elemental carbon Fine particle Sichuan Basin SOC Biomass burning RIVER DELTA REGION SECONDARY ORGANIC-CARBON ELEMENTAL CARBON DUST STORMS CHEMICAL-COMPOSITION SOUTHWESTERN CHINA BLACK CARBON PM2.5 URBAN EMISSIONS
DOI	10.1016/j.atmosenv.2014.05.037
英文摘要	The Sichuan Basin is a low visibility area in southwest China, where the hilly and basin topography, plus humid and stagnant weather, lead to unique pollution patterns. To identify the characteristics and sources of carbonaceous aerosols, one-year record of 24-h PM2.5 samples were analyzed for organic carbon (OC) and elemental carbon (EC) content following the thermal/optical transmission protocol at three cities (Chengdu (CD), Neijiang (NJ), and Chongqing (CQ)) in the region during May 2012 to April 2013. The annual average concentrations were 19.0 +/- 133 14 OC m(-3) and 4.6 +/- 2.6 mu g EC m(-3) in CD, 18.3 +/- 8.4 mu g OC m(-3) and 4.1 +/- 1.8 mu g EC m(-3) in NJ, and 15.2 +/- 8.4 mu g OC m(-3) and 4.0 +/- 1.6 mu g EC m(-3) in CQ, respectively. Organic matter (1.6OC) plus EC contributed about 40% of PM2.5 mass and displayed weak regional uniformity. Relatively high ratios of OC to EC were observed in the region with 4.3 for CD, 4.6 for NJ, and 3.8 for CQ, respectively. OC and EC pollution in the region exhibited interesting season-dependent characteristics with the lowest concentrations and OC/EC ratios in summer, but higher levels in other seasons. Higher OC/EC ratios in spring and autumn resulted from biomass burning, and in winter were from the enhanced secondary organic aerosol formation under favorable conditions. The exceptionally high OC and EC levels in May and October, mostly notable in CD, resulted from the burning of agricultural residues during harvest period. The high K+ concentrations and the high K-excess/EC ratios implied the persistent influence of biomass burning throughout the year. Using a novel technique combing the EC tracer method and potassium mass balance in the aerosols, a K/EC ratio of 1.22 was used to retrieve the OC from biomass burning and the estimated contributions were 30.8%, 283%, and 21.9% in CD, NJ, and CQ respectively, while secondary OC contributions to OC were 26.7%, 24.6%, and 25.7% in CD, NJ, and CQ respectively. (C) 2014 Elsevier Ltd. All rights reserved.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000340316300024&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Environmental Sciences; Meteorology & Atmospheric Sciences; SCI(E); EI; 13; ARTICLE; sdxie@pku.edu.cn; 215-223; 94
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/158237]
专题	环境科学与工程学院
推荐引用方式 GB/T 7714	Chen, Yuan,Xie, Shaodong,Luo, Bin,et al. Characteristics and origins of carbonaceous aerosol in the Sichuan Basin, China[J]. 大气环境,2014.
APA	Chen, Yuan,Xie, Shaodong,Luo, Bin,&Zhai, Chongzhi.(2014).Characteristics and origins of carbonaceous aerosol in the Sichuan Basin, China.大气环境.
MLA	Chen, Yuan,et al."Characteristics and origins of carbonaceous aerosol in the Sichuan Basin, China".大气环境 (2014).