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List of Abstracts 210Huey 51 Research Center for Advanced Science and Technology, The University of Tokyo2 Air Quality Research Center, University of California, Davis, USA3 NASA Langley Research Center, Hampton, Virginia, USA4 Institute of Ion Physics and Applied Physics, University of Innsbruck, Austria5 School of Earth & Atmospheric Sciences, Georgia Institute of Technology, USAContact: lokesh@atmos.rcast.u-tokyo.ac.jpBlack carbon (BC), light scattering particles (LSP), and trace gases were measured on board the NASA DC-8 aircraft over California during the ARCTAS-CARB campaign conducted in June 2008. A single particlesoot photometer (SP2) was used for measurements of BC and LSP. The aerosol concentrations showed largevariations related to various plumes from different regions of California. We used SO2 and CH3CN astracers to identify the fossil fuel (FF) and biomass-burning (BB) plumes, respectively. FF plumes were oftenobserved near the surface, while the influence of BB plumes was observed up to 4 km. The influence of BBat higher altitudes suggests the role of the convective up-lift of air parcels due to thermal energy at fire bases.The average BC mass concentrations in the FF and BB plumes were about 90-500 ng m-3 and 300-700 ngm-3, respectively. The mass concentrations of BC showed tight correlations with the mixing ratios of COand CO2 in the two types of plumes. The slopes of the BC-CO2 correlations were 17.9±8.7 ng m-3/ppmvand 271.5±87 ng m-3/ppmv for FF and BB plumes, respectively. On the other hand, the slopes of the BC-COcorrelations were similar in these plumes. The mass concentration of BC also showed good correlation withthe volume concentration (Vsc) of LSP. The Vsc/BC ratios were much higher in BB plumes than those in FFplumes. The number and mass-size distributions of BC and LSP showed single mode lognormal fits for thetwo types of the plumes. BC particles in fresh BB plumes were more thickly coated than in the fresh FFplumes indicating that BC was already thickly coated upon emissions by BB. These data are useful incharacterizing microphysical properties of primary aerosols from different sources, and for improvedunderstanding of the evolution of the properties associated with aging.P-Observations 2.87 ID:4436 10:30Lidar observations of the Kasatochi volcano aerosol plumeThomas Duck 1 , Lubna Bitar 1 , Nina Kristiansen 2 , Andreas Stohl 2 , Steve Beauchamp 31 Department of Physics and Atmospheric Science, Dalhousie University2 Norwegian Institute for Air Research (NILU)3 Meteorological Service of CanadaContact: tom.duck@dal.caThe eruption of Kasatochi volcano on 7-8 August 2008 injected about 1.7 Tg of SO2 into the troposphereand lower stratosphere. A week later the emissions were observed by the Dalhousie Raman Lidar as anaerosol plume in both the troposphere and stratosphere above Halifax, Nova Scotia. The stratospheric plumewas observed for four months as it gradually dispersed. Descent and vertical eddy diffusion brought theplume down to the tropopause, and so may partially explain aircraft observations of Kasatochi aerosol in theupper troposphere over those same four months. Aerosols from volcanic injections into the troposphere werealso observed above Halifax, but only in the few weeks after the eruption. Source attribution for the aerosolsis made using FLEXPART, a Lagrangian particle transport model. The aerosols appear to have reached thesurface near Halifax, although the net contribution to PM2.5 could have been no more than 5 microgramsper cubic meter. Identification of Kasatochi aerosols beyond the initial detections were not possible due tothe complex mixing processes in the troposphere combined with other natural and anthropogenic aerosolsources.iCACGP-IGAC 2010 14 July, 2010