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List of Abstracts 2001 Graduate School of Environmental Science, Hokkaido University, Japan2 Institute of Low Temperature Science, Hokkaido University, JapanContact: nannan@pop.lowtem.hokudai.ac.jpTotal suspended particles (n=58) were collected at Mangshan, a suburban area located in the north ofBeijing, China in autumn 2007. They were analyzed for low molecular weight α,ω-dicarboxylic acids (C2-C12), ketoacids (ωC2-ωC4, pyruvic acid), α-dicarbonyls (C2-C3) as well as aromatic (phthalic, iso and terephthalic)acids, using a capillary gas chromatography. Molecular distributions of diacids demonstrated thatoxalic (C2) acid was the most abundant species followed by succinic acid (C4) and malonic acid (C3).Higher carbon number diacids were less abundant. C2 diacid constituted 38–77% of total diacids. For mostcompounds, the concentrations were higher in daytime than nighttime. This result indicates that diacids areproduced by photochemical oxidation of organic compounds, which are emitted from anthropogenic sourcesin Beijing, and then transported to Mangshan area by the northward wind in daytime. However, higherconcentrations of C2 were observed in nighttime rather than in daytime. Positive correlations of C2 withglyoxylic acid (ωC2) and pyruvic acid (Pyr), and high relative humidity at night suggests that secondaryproduction of C2 occurs probably via aqueous phase oxidation of both ωC2 and Pyr in nighttime. HighC3/C4 and Ph/C4 ratios suggest that automobiles exhaust and fossil-fuel combustion products fromindustries in Beijing are important anthropogenic sources. This study also demonstrates that secondaryorganic aerosols are significantly produced in the vicinity of Beijing.P-Observations 2.68 ID:3548 10:30Source provenance of size- and time-resolved fine ambient particle fractions from the southeast ofBeijingBettina Nekat, Dominik Van Pinxteren, Yoshiteru Iinuma, Thomas Gnauk, Konrad Müller, HartmutHerrmannLeibniz-Institute for Tropospheric Research LeipzigContact: nekat@tropos.deThe Beijing area suffers heavy air pollution and associated particle emissions caused by the rapideconomical growth during the past decades. The aerosol affects the regional air quality and visibility as wellas cloud formation processes and the radiative balance of the atmosphere by its chemical, optical andmicrophysical properties. The project targets to study microphysical and chemical parameters of fine aerosolin order to associate the chemical composition of particles with their ability as cloud condensation nuclei.For this purpose, two measurement campaigns were performed at a background site near Beijing. The wintercampaign was carried out in March 2009 and the summer campaign took place from mid July 2009 to midAugust 2009. PM 1 samples were continuously sampled every 24 hours using a DIGITEL high volumesampler and size- and time-resolved aerosol samples were collected using 11-stage Berner impactor. Thisstudy presents the results of the chemical characterization of the PM 1 and impactor samples, which wereanalyzed for the mass concentration, inorganic ions and carbon sum parameters such as elemental, organicand water soluble organic carbon (WSOC). The WSOC fraction was characterized for hygroscopicsubstances such as dicarboxylic acids and saccharides. Additionally, fatty acids were analyzed to investigatesurface active substances. Polycyclic aromatic hydrocarbons, alkanes and hopanes were analyzed foranthropogenic emissions and metals for crust material. During the winter time the highest concentrationswere observed during periods with prevailing wind directions from southern areas, while northern winddirections led to lower concentrations. The main components of the fine particles are inorganic ions andcarbonaceous material. The organic carbon fraction is mostly dominated by WSOC. High concentrations oftracers such as levoglucosan indicate an influence of biomass burning as one source of organic particles inthe area.iCACGP-IGAC 2010 14 July, 2010