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List of Abstracts 69have included sea salt, sulphate, nitrate, organic carbon, black carbon and mineral dust and results will bediscussed. With the goal of optimizing the size spectrum resolution to process and aerosol modedependency, column model sensitivity tests have been performed to determine the response of dry and wetdeposition and assumed mass and number distributions to the size partitioning of the distribution. The resultsfrom GEM-AQ using this optimum size-partitioning for dry and wet deposition will be presented.P-Chemistry Climate.21 ID:4574 15:35Simulations of Aerosol Microphysics in the NASA GEOS-5 ModelPeter Colarco 1 , Jamison Smith 2 , Cynthia Randles 3 , Arlindo Da Silva 11 NASA GSFC2 LASP/University of Colorado3 GEST-UMBC/NASA GSFCContact: Peter.R.Colarco@nasa.govAerosol-cloud-chemistry interactions have potentially large but uncertain impacts on Earth's climate. Onepath to addressing these uncertainties is to construct models that incorporate various components of theEarth system and to test these models against data. To that end, we have previously incorporated theGoddard Chemistry, Aerosol, Radiation, and Transport (GOCART) module online in the NASA GoddardEarth Observing System model (GEOS-5). GEOS-5 provides a platform for Earth system modeling,incorporating atmospheric and ocean general circulation models, a land surface model, a data assimilationsystem, and treatments of atmospheric chemistry and hydrologic cycle. Including GOCART online in thisframework has provided a path for interactive aerosol-climate studies; however, GOCART only tracks themass of aerosols as external mixtures and does not include the detailed treatments of aerosol size distributionand composition (internal mixtures) needed for aerosol-cloud-chemistry-climate studies. To address thatneed we have incorporated the Community Aerosol and Radiation Model for Atmospheres (CARMA) onlinein GEOS-5. CARMA is a sectional aerosol-cloud microphysical model, capable of treating both aerosol sizeand composition explicitly be resolving the aerosol distribution into a variable number of size andcomposition groupings. Here we present first simulations of dust, sea salt, and smoke aerosols in GEOS-5 astreated by CARMA. These simulations are compared to available aerosol satellite, ground, and aircraft dataand as well compared to the simulated distributions in our current GOCART based system.P-Chemistry Climate.22 ID:4226 15:35Implications of climatological versus fully interactive aerosol distributions on direct and semi-directaerosol forcing and response in the NASA GEOS-5 atmospheric general circulation modelCynthia Randles 1 , Peter Colarco 2 , Arlindo Da Silva 3 , Ravi Govindaraju 4 , Ed Nowottnick 51 UMBC GEST/NASA GSFC Code 613.32 NASA GSFC Code 613.33 NASA GSFC Code 610.14 SAIC5 ESSIC/University of MarylandContact: Cynthia.A.Randles@nasa.govAbsorbing aerosols such as dust and black carbon reduce the amount of radiation reaching Earth’s surface(aerosol direct effect), and contribute to a radiative heating in the atmosphere (aerosol semi-direct effect).This re-partitioning of energy between the surface and the atmosphere has consequences for regionaldynamics and the hydrologic cycle. We have implemented a version of the Goddard Chemistry, Aerosol,Radiation, and Transport (GOCART) model online in the NASA Goddard Earth Observing System modelversion 5 (GEOS-5). GOCART includes representations of the sources, sinks, and chemical transformationiCACGP-IGAC 2010 12 July, 2010