Geoscientific Model Development Discussions www.geosci-model-dev-discuss.net 1991-9611 1991-962X 2 2 2009 10.5194/gmdd-2-1157-2009 http://www.geosci-model-dev-discuss.net/2/1157/2009/ http://www.geosci-model-dev-discuss.net/2/1157/2009/gmdd-2-1157-2009.html http://www.geosci-model-dev-discuss.net/2/1157/2009/gmdd-2-1157-2009.pdf 1157 1213 2009-08-27 Description and evaluation of the Model for Ozone and Related chemical Tracers, version 4 (MOZART-4) L. K. Emmons S. Walters P. G. Hess J.-F. Lamarque G. G. Pfister D. Fillmore C. Granier A. Guenther D. Kinnison T. Laepple J. Orlando X. Tie G. Tyndall C. Wiedinmyer S. L. Baughcum S. Kloster National Center for Atmospheric Research, Boulder, CO, USA Centre National de la Recherche Scientifique, Paris, France NOAA, Earth System Research Laboratory, Boulder, CO, USA Boeing Company, Seattle, WA, USA Max-Planck-Institute for Meteorology, Hamburg, Germany now at: Cornell University, Ithaca, NY, USA now at: Tech-X Corporation, Boulder, CO, USA now at: Alfred Wegener Inst. for Polar and Marine Research, Bremerhaven, Germany The Model for Ozone and Related chemical Tracers, version 4 (MOZART-4) is an offline global chemical transport model particularly suited for studies of the troposphere. The updates of the model from its previous version MOZART-2 are described, including an expansion of the chemical mechanism to include more detailed hydrocarbon chemistry and bulk aerosols. Online calculations of a number of processes, such as dry deposition, emissions of isoprene and monoterpenes and photolysis frequencies, are now included. 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