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List of Abstracts 32previous global dataset and new IPCC inventories (Lamarque et al., 2010). These new inventories associatedwith most recent biomass burning inventory (Liousse et al., 2010) were tested in the ORISAM-TM5 globalchemistry-climate model with a focus over Africa at a resolution of 1° x 1° resolution. For this purpose, aglobal simulation was performed for 2005 and for 2030, including a 6-bin sectional aerosol module,comprising BC and primary OC. Modelled particulate concentrations were compared to availablemeasurements in African cities (e.g. Bamako, Cotonou and Dakar) together with modelled aerosol opticaldepth values with Aeronet and PARASOL and MODIS satellite data. Major trends observed over Africantowns are better reproduced by our global model supplemented with our regional inventory. Sensitivity testsdriven by different emission scenarios will be presented.P-Sources.45 ID:4212 15:35Regional aerosol pollution potential of major population centersDaniel Kunkel 1 , Mark G. Lawrence 2 , Holger Tost 1 , Astrid Kerkweg 3 , Patrick Jöckel 41 Max-Planck-Institute for Chemistry, Mainz, Germany2 Max-Planck-Institute for Chemistry, Mainz and University of Mainz, Germany3 Institute for Atmospheric Physics, Johannes-Gutenberg University, Mainz, Germany4 Deutsches Zentrum für Luft-und Raumfahrt (DLR), IPA, Oberpfaffenhofen, D-82234 Weßling, GermanyContact: daniel.kunkel@mpic.deEmissions from major population centers (MPCs), including megacities, are becoming more and moreimportant for the global burden of air pollutants. Once emitted to the atmosphere, aerosols from MPCs areexpected to show differences in their atmospheric dispersion, depending on the aerosol size and thegeographical location of the MPC, which will result in differences in their potential to pollute the surface andthe atmosphere locally and at downwind locations.Several simulations of monodisperse passive aerosol tracers with sizes of 0.1, 1.0, 2.5, and 10.0 µm areconducted with the global chemistry circulation model EMAC (ECHAM5-MESSy-Atmospheric-Chemistry).Several MPCs around the world were chosen as point sources with the same total, constant emission fluxwhich allows us to compare how different source locations pollute the atmosphere and the surface ondifferent horizontal scales. All tracers undergo transport, dry as well as wet deposition; sensitivitysimulations with different assumptions about the aerosol solubility are performed.The analysis focuses on major transport pathways, either to nearby or remote lower atmospheric levels, or tothe upper troposphere, and on the deposition location, strength, and kind of deposition. Larger particles tendto more effectively result in local pollution buildup and to be deposited in greater amounts near their sources,whereas smaller particles are transported more effectively to remote locations, at both low and high altitudes.The 0.1 and 1.0 µm radius aerosols tend to behave similarly in terms of transport and deposition, but showdifferences concerning the aerosol solubility, while the 2.5 µm aerosols represent a transition between thebehaviour of the 1.0 and 10 µm size class.The analysis presented here provides an effective comparison of how individual MPCs pollute themselvesand their environment, particularly in light of differences in regional geographical and meteorologicalcharacteristics.iCACGP-IGAC 2010 12 July, 2010