Spatial and seasonal variations of fine particle water-soluble organic   carbon (WSOC) over the southeastern United States: implications for   secondary organic aerosol formation

doi:10.5194/acp-12-6593-2012

CORC > 北京大学 > 环境科学与工程学院

	Spatial and seasonal variations of fine particle water-soluble organic carbon (WSOC) over the southeastern United States: implications for secondary organic aerosol formation
	Zhang, X. ; Liu, Z. ; Hecobian, A. ; Zheng, M. ; Frank, N. H. ; Edgerton, S. ; Weber, R. J.
刊名	atmospheric chemistry and physics
	2012
关键词	ATMOSPHERIC AEROSOL ATLANTA SUPERSITE PM2.5 EMISSIONS IMPACT MODEL URBAN SOA METHYLGLYOXAL HYDROCARBONS
DOI	10.5194/acp-12-6593-2012
英文摘要	Secondary organic aerosol (SOA) in the southeastern US is investigated by analyzing the spatial-temporal distribution of water-soluble organic carbon (WSOC) and other PM2.5 components from 900 archived 24-h Teflon filters collected at 15 urban or rural EPA Federal Reference Method (FRM) network sites throughout 2007. Online measurements of WSOC at an urban/rural-paired site in Georgia in the summer of 2008 are contrasted to the filter data. Based on FRM filters, excluding biomass-burning events (levoglucosan < 50 ng m(-3)), WSOC and sulfate were highly correlated with PM2.5 mass (r(2)similar to 0.7). Both components comprised a large mass fraction of PM2.5 (13% and 31%, respectively, or similar to 25% and 50% for WSOM and ammonium sulfate). Sulfate and WSOC both tracked ambient temperature throughout the year, suggesting the temperature effects were mainly linked to faster photochemistry and/or synoptic meteorology and less due to enhanced biogenic hydrocarbon emissions. FRM WSOC, and to a lesser extent sulfate, were spatially homogeneous throughout the region, yet WSOC was moderately enhanced (27%) in locations of greater predicted isoprene emissions in summer. A Positive Matrix Factorization (PMF) analysis identified two major source types for the summer WSOC; 22% of the WSOC were associated with ammonium sulfate, and 56% of the WSOC were associated with brown carbon and oxalate. A small urban excess of FRM WSOC (10%) was observed in the summer of 2007, however, comparisons of online WSOC measurements at one urban/rural pair (Atlanta/Yorkville) in August 2008 showed substantially greater difference in WSOC (31%) relative to the FRM data, suggesting a low bias for urban filters. The measured Atlanta urban excess, combined with the estimated boundary layer heights, gave an estimated Atlanta daily WSOC production rate in August of 0.55 mgC m(-2) h(-1) between mid-morning and mid-afternoon. This study characterizes the regional nature of fine particles in the southeastern US, confirming the importance of SOA and the roles of both biogenic and anthropogenic emissions.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000306808300034&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Meteorology & Atmospheric Sciences; SCI(E); 28; ARTICLE; 14; 6593-6607; 12
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/393888]
专题	环境科学与工程学院
推荐引用方式 GB/T 7714	Zhang, X.,Liu, Z.,Hecobian, A.,et al. Spatial and seasonal variations of fine particle water-soluble organic carbon (WSOC) over the southeastern United States: implications for secondary organic aerosol formation[J]. atmospheric chemistry and physics,2012.
APA	Zhang, X..,Liu, Z..,Hecobian, A..,Zheng, M..,Frank, N. H..,...&Weber, R. J..(2012).Spatial and seasonal variations of fine particle water-soluble organic carbon (WSOC) over the southeastern United States: implications for secondary organic aerosol formation.atmospheric chemistry and physics.
MLA	Zhang, X.,et al."Spatial and seasonal variations of fine particle water-soluble organic carbon (WSOC) over the southeastern United States: implications for secondary organic aerosol formation".atmospheric chemistry and physics (2012).