ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-9-2843-2009 The Coupled Aerosol and Tracer Transport model to the Brazilian developments on the Regional Atmospheric Modeling System (CATT-BRAMS) – Part 1: Model description and evaluation Freitas S. R. 1 Longo K. M. 1 8 Silva Dias M. A. F. 1 2 Chatfield R. 3 Silva Dias P. 2 Artaxo P. 4 Andreae M. O. 5 Grell G. 6 Rodrigues L. F. 1 Fazenda A. 1 7 Panetta J. 1 Center for Weather Forecasts and Climate Studies (CPTEC), INPE, Cachoeira Paulista, Brazil Department of Atmospheric Sciences, University of São Paulo, Brazil NASA Ames Research Center, Moffett Field, USA Institute of Physics, University of São Paulo, Brazil Max Planck Institute for Chemistry, Mainz, Germany Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado/NOAA Research-Forecast Systems Laboratory, Boulder, CO, USA Department of Computing Science, University of Taubaté, São Paulo, Brazil now at: Center for Space and Atmospheric Sciences, INPE, São José dos Campos, Brazil 28 04 2009 9 8 2843 2861 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/9/2843/2009/acp-9-2843-2009.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/9/2843/2009/acp-9-2843-2009.pdf

We introduce the Coupled Aerosol and Tracer Transport model to the Brazilian developments on the Regional Atmospheric Modeling System (CATT-BRAMS). CATT-BRAMS is an on-line transport model fully consistent with the simulated atmospheric dynamics. Emission sources from biomass burning and urban-industrial-vehicular activities for trace gases and from biomass burning aerosol particles are obtained from several published datasets and remote sensing information. The tracer and aerosol mass concentration prognostics include the effects of sub-grid scale turbulence in the planetary boundary layer, convective transport by shallow and deep moist convection, wet and dry deposition, and plume rise associated with vegetation fires in addition to the grid scale transport. The radiation parameterization takes into account the interaction between the simulated biomass burning aerosol particles and short and long wave radiation. The atmospheric model BRAMS is based on the Regional Atmospheric Modeling System (RAMS), with several improvements associated with cumulus convection representation, soil moisture initialization and surface scheme tuned for the tropics, among others. In this paper the CATT-BRAMS model is used to simulate carbon monoxide and particulate material (PM<sub>2.5</sub>) surface fluxes and atmospheric transport during the 2002 LBA field campaigns, conducted during the transition from the dry to wet season in the southwest Amazon Basin. Model evaluation is addressed with comparisons between model results and near surface, radiosondes and airborne measurements performed during the field campaign, as well as remote sensing derived products. We show the matching of emissions strengths to observed carbon monoxide in the LBA campaign. A relatively good comparison to the MOPITT data, in spite of the fact that MOPITT a priori assumptions imply several difficulties, is also obtained.

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