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List of Abstracts 190possible to distinguish between pollutants emitted from chimneys and those due to surface emissions. Thesespecific markers will make it possible to use a positive matrix factorization (PMF) modeling to calculate thecontribution of an industrial source and to study the evolution of this contribution in regard ofmeteorological conditions.P-Observations 2.49 ID:4537 10:30Observations of BVOC (Biogenic Volatile Organic Compound) Fluxes and Vertical Gradients in aPonderosa Pine Forest during BEARPEX 2009Jeong-Hoo Park, Silvano Fares, Robin Weber, Allen GoldsteinUniversity of California at BerkeleyContact: j-hpark@berkeley.eduDuring summer 2009 an intensive field campaign (Biosphere Effects on AeRosols and PhotochemistryEXperiment - BEARPEX) took place in Blodgett Forest, a Ponderosa pine forest in the Sierra NevadaMountains of California. The campaign was aimed to understand the biosphere-atmosphere interactionsduring a period of intense photochemical activity, to elucidate the fate BVOC (Biogenic Volatile OrganicCompounds) in the atmosphere, and explore the processes of secondary organic aerosol formation. In thisstudy, a PTR-MS (Proton Transfer Reaction – Mass Spectrometry) was used to measure 19 compounds(masses) including methanol, isoprene + MBO (2-Methyl-3-butene-2-ol), monoterpenes, sesquiterpenes, andsome oxygenated BVOCs at 5 heights of a vertical gradient from the forest floor to above the canopy. Fluxesof the 4 dominant BVOCs were measured above the canopy with the Eddy covariance technique. In parallelwith BVOC measurements, ozone fluxes and gradients, and meteorological parameters (PAR, temperature,relative humidity, wind speed, and wind direction) were recorded in order to test the dependence of BVOCfrom meteorological conditions and to test the hypothesis that BVOC remove atmospheric ozone throughgas-phase reactions. Data will be compared to previous from the same site collected at different periods ofthe year to explore the dynamics of BVOC concentration and oxidation products as a function of varyingenvironmental conditions.P-Observations 2.50 ID:4366 10:30Size-resolved Aerosol Measurement and Its Light Attenuation Characteristics in Seoul, KoreaKyungwon Kim 1 , Young J. Kim 21 Dept. of Environmental and Energy Science Gyeongju University2 Advanced Environmental Monitoring Research Center, Gwangju Institute of Science and Technology(GIST)Contact: kwkim@gju.ac.krAerosol can scatter and absorb the light, which cause visibility impairment in the atmosphere. Lightattenuation efficiency depends on aerosol size distribution, chemical composition, and relative humidity. Inorder to investigate the amounts of light attenuation efficiencies for PM1.0, PM2.5, and PM10, severalintensive visibility monitoring conducted from May 2007 to Nov. 2009 in the urban area of Seoul, Korea.Semi-continuous 2-hour aerosol sampling produced time-resolved chemical composition for visibilityimpairing aerosol and real-time optical measurements made a light extinction coefficient, a light scatteringcoefficient, and a light absorption coefficient using a transmissometer, a nephelometer, and an aethalometer,respectively. 455 data sets were used to determine the light extinction efficiencies for size-resolved aerosol.From the results, visibility varied with chemical compositions of PM1.0, PM2.5, and PM10.And underconsideration of water growth function f(RH), the light extinction efficiencies of PM1.0, PM2.5, and PM10were estimated to be 8.6, 4.5, and 2.7 m2/g respectively.iCACGP-IGAC 2010 14 July, 2010