Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 2 2009 10.5194/acpd-9-9151-2009 http://www.atmos-chem-phys-discuss.net/9/9151/2009/ http://www.atmos-chem-phys-discuss.net/9/9151/2009/acpd-9-9151-2009.html http://www.atmos-chem-phys-discuss.net/9/9151/2009/acpd-9-9151-2009.pdf 9151 9169 2009-04-07 A comparison study of regional atmospheric simulations with an elastic backscattering Lidar and Sunphotometry in an urban area E. Landulfo landulfo@gmail.com S. R. Freitas K. M. Longo S. T. Uehara P. Sawamura Instituto de Pesquisas Energéticas e Nucleares – IPEN, São Paulo, Brazil Centro de Previsão do Tempos e Estudos Climáticos – CPTEC, Cachoeira Paulista, Brazil We describe a comparison study of aerosol optical thickness (AOT) from numerical simulations using a regional atmospheric model with an elastic backscattering lidar operating at 532 nm and a sunphotometer belonging to the AERONET network at São Paulo (23° S 46° W) city, Brazil, a very populated urban area. The atmospheric model includes an aerosol emission, transport and deposition module coupled to a radiative transfer parameterization, which takes the interaction between aerosol particles and short and long wave radiation into account. A period of one week was taken as case study during the dry season (late August) when intense biomass burning activities occur in remote areas in South America, and meteorological conditions disfavor the pollution dispersion in the city of São Paulo. 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