Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 9 18 2009 10.5194/acp-9-6767-2009 http://www.atmos-chem-phys.net/9/6767/2009/ http://www.atmos-chem-phys.net/9/6767/2009/acp-9-6767-2009.html http://www.atmos-chem-phys.net/9/6767/2009/acp-9-6767-2009.pdf 6767 6774 2009-09-18 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 at remote areas in South America, and meteorological conditions disfavor the pollution dispersion in the city of São Paulo. The situation presented here showed how smoke from biomass burning in remote areas is transported to the south-east part of Brazil and affects the optical atmospheric conditions in São Paulo. The numerical simulations are corroborated by in situ measurements of AOT obtained by lidar and sun photometry. Ackermann, J.: The Extinction-to-Backscatter Ratio of Tropospheric Aerosol: A Numerical Study, J. Atmos. Ocean. Tech., 15, 1043–1050, 1998. Anderson, T L., Masonis, S J., Covert, D V., Charlson, R J., and Rood, M J.: In situ measurement of the aerosol extinciton-to-backscatter ratio at a polluted continental site., J. Geophys. Res., 105, 26907–26915, 2000. Cattrall, C., Reagan, J., Thome, K., and Dubovik, O.: Variability of aerosol and spectral lidar and backscatter and extinction ratios of key aerosol types derived from selected Aerosol Robotic Network locations, J. Geophys. Res., 110(D10), D10SA11, doi:10.1029/2004JD005124, 2005. Dubovik, O., Holben, B., Eck, T F., Smirnov, A., Kaufman, Y J., King, M D., Tanré, D., and Slutsker, I.: Variability of Absorption and Optical Properties of Key Aerosol Types Observed in Worldwide Locations, J. Atmos. Sci., 59, 590–608, 2002. Freitas, S., Longo, K., Silva~Dias, M., Silva~Dias, P., Chatfield, R., Prins, E., Artaxo, P., Grell, G., and Recuero, F.: Monitoring the transport of biomass burning emissions in South America, Environ. Fluid Mech., 5(1–2), 135–167, doi:10.1007/s10652-005-0243-7, 2005. Freitas, S. R., Longo, K. M., Silva Dias, M. A. F., Chatfield, R., Silva Dias, P., Artaxo, P., Andreae, M. O., Grell, G., Rodrigues, L. F., Fazenda, A., \ and Panetta, J.: 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, Atmos. Chem. Phys., 9, 2843–2861, 2009. Gevaerd, R. and Freitas, S R.: Estimativa operacional da umidade do solo para inicia\c cão de modelos de previsão numérica da atmosfera, Parte~I: Descri\c cão da metodologia e valida\c cão, Revista Brasileira de Meteorologia, 21(3a), 59–73, 2006. Giglio, L., Descloitres, J., Justice, C O., and Kaufman, Y J.: An enhanced contextual fire detection algorithm for MODIS, Remote Sens. Environ., 87, 273–282, 2003. Holben, B N., Eck, T F., Slustker, I., Tanré, D., Buis, D P., Setzer, A F., Vermote, E., Reagan, J A., Kaufman, Y J., Nakajima, T., Lavenu, F., Jankowiak, I., and Smirnov, A.: Aeronet – a federal instrument networkand data archive for aerosol characterization, Remote Sens. Environ., 66, 1–66, 1998. Klett, J.: Lidar Inversion with variable backscatter/extinction ratios, Appl. Optics, 24, 1638–1643, 1985. Landulfo, E., Papayannis, A., Artaxo, P., Castanho, A. D. A., de Freitas, A. Z., Souza, R. F., Vieira Junior, N. D., Jorge, M. P. M. P., Sánchez-Ccoyllo, O. R., and Moreira, D. S.: Synergetic measurements of aerosols over São Paulo, Brazil using LIDAR, sunphotometer and satellite data during the dry season, Atmos. Chem. Phys., 3, 1523–1539, 2003. Landulfo, E., Papayannis, A., Freitas, A Z., Vieira Jr., N D., Souza, R F., Gonçalves, A., Castanho, A D A., Artaxo, P., Sánchez-CCoyllo, O R., Moreira, D S., and Jorge, M P M P.: Tropospheric aerosol observations in Sao Paulo, Brazil using a compact lidar system, Int. J. Remote Sens., 13, 2797–2816, 2005. Longo, K. M., Freitas, S. R., Setzer, A., Prins, E., Artaxo, P., and Andreae, M. O.: The Coupled Aerosol and Tracer Transport model to the Brazilian developments on the Regional Atmospheric Modeling System (CATT-BRAMS) - Part~2: Model sensitivity to the biomass burning inventories, Atmos. Chem. Phys. Discuss., 7, 8571–8595, 2007. Longo, K M., Freitas, S R., Dias, M S., and Dias, P S.: Numerical modelling of the biomass-burning aerosol direct radiative effects on the thermodynamics structure of the atmosphere and convective precipitation, in: International Conference on Southern Hemisphere Meteorology and Oceanography (ICSHMO),8, edited by: São Jos\~e~dos Campos, I., 283–289, 2006a. Longo, K M., Freitas, S R., Ulke, A G., and Hierro, R F.: Transport of biomass burning products in Southeastern South America and its relationship with the South American Low Level Jet East of the Andes, in: International Conference on Southern Hemisphere Meteorology and Oceanography (ICSHMO), 8, edited by: São José~dos Campos, I., 121–129, 2006b. Prins, E M., Feltz, J M., Menzel, W P., and Ward, W D.: An Overview of GOES-8 Diurnal Fire and Smoke Results for SCAR-B and 1995 Fire Season in South America., J. Geophys. Res., 103(D24), 31821–31835, 1995. Reid, J S., Ferek, R J., Blake, D R., Martins, J V., and Liousse, C.: Physical and Optical properties of regional hazes dominated by smoke in Brazil, J. Geophys. Res., 103, 32059–32080, 1998. Setzer, A. and Pereira, M.: Amazonia biomass burnings in 1987 and an estimate of their tropospheric emissions, Ambio, 20, 19–22, 1991. Smirnov, A., Holben, B N., Eck, T., Dubovik, O., and Slutsker, I.: Cloud screening and quality control algorithms for the AERONET database, Remote Sens. Environ., 73, 337–349, 2005. Vera, C., Baez, J., Douglas, M., Emmanuel, C B., Marengo, J., Meitin, J., Nicolini, M., Nogues-Paegle, J., Paegle, J., Penalba, O., Salio, P., Saulo, C., Silva~Dias, M A., Silva~Dias, P., and Zipser, E.: The South American Low-Level Jet Experiment, B. Am. Meteorol. Soc., 87, 63–77, 2006. Walko, R., Band, L., Baron, J., Kittel, F., Lammers, R., Lee, T., Ojima, D., Pielke, R., Taylor, C., Tague, C., Tremback, C., and Vidale, P.: Coupled Atmosphere-Biophysics-Hydrology Models for Environmental Modeling., J. Appl. Meteorol., 39(6), 931–944, 2000.