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List of Abstracts 65P-Chemistry Climate.13 ID:4249 15:35Composition, Size Distributions, and Elemental Source Markers in Aerosols Over Snow and Ice -Comparing Greenland and Mid-Latitude Mountain Environments to Improve Global Simulation ofAerosol-Cryosphere Interactions.Richard VanCuren, Thomas CahillUniversity of California, DavisContact: ravancuren@ucdavis.eduAerosol deposition is believed to significantly alter the albedo, and thus melt rates, of snow and ice in polarand montane environments, with important consequences for planetary radiation balance, regionalhydrology, and water resources. Accurate modeling of aerosol-snow interactions requires detailedinformation on the physical and chemical characteristics of the aerosols. Analysis of in-situ measurements ofaerosols over snow and ice provides insights into the nature and sources of the aerosols and permitsevaluating the quality of model simulations at local to global scales. We report analyses of more than 2000Daily size-resolved aerosol samples collected from 2003 through 2006 at the summit of the Greenland IceCap and at high altitude sites in the Sierra-Cascade Range in western North America. These data permitcomparison of aerosols over snow at hemispheric, regional, and local scales. We find significant differencesin the nature of aerosol - cryosphere relationships at all three scales.P-Chemistry Climate.14 ID:4208 15:35Model evaluation for air quality prediction in a changing climateAstrid Manders 1 , Andrea Mues 2 , Bert Van Ulft 3 , Erik Van Meijgaard 3 , Martijn Schaap 11 TNO2 Freie Universitat Berlin3 KNMIContact: astrid.manders@tno.nlClimate change may have a significant impact on the dynamics and chemistry of the atmosphere and maythus affect air quality. To date, little is known about the effects of climate change on the concentrations ofozone and particulate matter. Especially for particulate matter the few available studies do not provide aconsistent result, including the sign of the effect. The regional chemistry transport model LOTOS-EUROShas a long tradition in modelling ozone and particulate matter, with transport driven by ECMWF analysismeteorology. Recently, the model was coupled to the regional climate model RACMO. We haveinvestigated the performance of the combination LOTOS-EUROS/RACMO for climate modelling. To thisend, air quality simulations driven by analysed meteorology were compared to two present day climatesimulations downscaling ECHAM and MYROC GCM results. All simulations were compared to(climatological) observations. In this way, biases in the RACMO climate meteorology and their impact onmodelled air quality can be quantified. Thorough knowledge on biases and their impacts is crucial for theassessment of scenarios for a future climate.P-Chemistry Climate.15 ID:4463 15:35Ensemble Analyses of the Effects of Global Change on US Air QualityRodrigo Gonzalez-Abraham 1 , Serena H. Chung 1 , Jeremy Avise 2 , Alfredo Arroyo 1 , Eric P. Salathe 3 ,Yongxin Zhang 4 , David G. Streets 5 , Chris Nolte 6 , Dan Loughlin 6 , Alex Guenther 4 , ChristineWiedinmyer 4 , Tiffany Duhl 41 Washington State University2 California Air Resources BoardiCACGP-IGAC 2010 12 July, 2010