title: [Characterization and reconstruction of aerosol light scattering coefficient at Chengdu during biomass burning and dust storm period in spring].
abstract: Aerosol samples for PM2.5 were collected from 19 April to 17 May in 2009 at Chengdu. The concentrations of organic carbon, element carbon, water-solubility ions, crustal elements and levoglucosan of all particle samples were determined by thermal/ optical carbon analyzer,ion chromatography, X-ray fluorescence spectrometer and high performance anion exchange chromatography, respectively. In-situ scattering coefficients (b(sp)) and meteorological parameters for this period were also conducted. Ambient scattering coefficients were reconstructed by IMPROVE formula and compared with measured scattering coefficients. The results showed that the average mass concentration of PM2.5 and measured b(sp) were 133.2 microg x m(-3) and 530 Mm(-1), respectively. Levoglucosan and crustal elements were good traces for biomass burning and dust storm events, respectively. The calculated b'sp was 504 Mm(-1) during campaigning period. The major contributors to scattering coefficients included: (NH4)2SO4 (26%), NH4NO3 (15%), OM (53%), FS (4%) and CM (2%), respectively. The calculated b'sp was 575 Mm(-1) and the dominant species were FS (17%) and CM (21%) during dust storm period (DS). The calculated b'sp was 635 Mm(-1) and OM contributed 62% during biomass burning (BB) period.
authors.affiliation: South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou 510655, China. yuejianhua@scies.org
authors.forename: Jian-Hua
authors.initials: JH
authors.lastname: Yue
authors.forename: Jun
authors.initials: J
authors.lastname: Tao
authors.forename: Ze-Jian
authors.initials: ZJ
authors.lastname: Lin
authors.forename: Li-Hua
authors.initials: LH
authors.lastname: Zhu
authors.forename: Jun-Ji
authors.initials: JJ
authors.lastname: Cao
authors.forename: Lei
authors.initials: L
authors.lastname: Luo
mesh_terms: D000336:Aerosols / Q000032:analysis*; D000393:Air Pollutants / Q000032:analysis*; D018533:Biomass; D002681:China; D004391:Dust / Q000032:analysis*; D017745:Incineration; D008027:Light; D052638:Particulate Matter / Q000032:analysis*; D012542:Scattering, Radiation; D012621:Seasons
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D004391:Dust; D052638:Particulate Matter