title: Characterization of carbonaceous aerosols at Mount Lu in South China: implication for secondary organic carbon formation and long-range transport.
abstract: In order to understand the sources and potential formation processes of atmospheric carbonaceous aerosols in South China, fine particle samples were collected at a high-elevation mountain site--Mount Lu (29°35' N, 115°59' E, 1165 m A.S.L.) during August-September, 2011. Eight carbonaceous fractions from particles were resolved following the IMPROVE thermal/optical reflectance protocol. During the observation campaign, the daily concentrations of PM2.5 at Mount Lu ranged from 7.69 to 116.39 μg/m(3), with an average of 58.76 μg/m(3). The observed average organic carbon (OC) and elemental carbon (EC) concentrations in PM2.5 were 3.78 and 1.28 μg/m(3), respectively. Secondary organic carbon (SOC) concentration, estimated by EC-tracer method, was 2.07 μg/m(3) on average, accounting for 45.0% of the total OC. The enhancement of secondary organic aerosol (SOA) formation was observed during cloud/fog processing, and heterogeneous acid-catalyzed reactions may have contributed to SOA formation as well. Back trajectory analysis indicated that air masses were mainly sourced from southern China during observation period, and this air mass source was featured by highest values of OC and effective carbon ratio (ECR). Relation of carbonaceous species and principal component analysis indicated that multiple sources contributed to the carbonaceous aerosols at Mount Lu.
authors.affiliation: School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin, 300384, China, lipenghui406@163.com.
authors.forename: Peng-hui
authors.initials: PH
authors.lastname: Li
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.forename: Tao
authors.initials: T
authors.lastname: Li
authors.forename: Lei
authors.initials: L
authors.lastname: Sun
authors.forename: Xianliang
authors.initials: X
authors.lastname: Yi
authors.forename: Li-qiong
authors.initials: LQ
authors.lastname: Guo
authors.forename: Rui-hong
authors.initials: RH
authors.lastname: Su
mesh_terms: D000336:Aerosols; D000393:Air Pollutants / Q000032:analysis* / Q000737:chemistry*; D001272:Atmosphere; D002244:Carbon / Q000032:analysis* / Q000737:chemistry*; D002681:China; D004784:Environmental Monitoring; D009038:Motion; D009930:Organic Chemicals / Q000032:analysis* / Q000737:chemistry*; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis / Q000737:chemistry
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D009930:Organic Chemicals; D052638:Particulate Matter; D002244:Carbon