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Modeling aerosol optical properties in Amazonia obtained by AERONET and preliminary radiative forcing study

Melina M A Paixão, Universidade de São Paulo, (Presenting)
Paulo Artaxo, Universidade de São Paulo,
Brent Holben, NASA Goddard Space Flight Center,
Joel Schafer, NASA Goddard Space Flight Center,

This study presents the first results of a model of aerosol optical properties based on aerosol optical depth (AOD) ranges for Amazonian AERONET/NASA (Aerosol Robotic Network) sites such as Abracos Hill (RO), Alta Floresta (MT), Rio Branco (AC), Cuiabá (MT) and Campo Grande (MS). The biomass burning emissions in Amazonia are very important in the global radiative balance and understanding how it changes the atmospheric composition during the year can let us estimate better the radiative impact. We distinguish 3 main seasons: wet, dry and biomass burning. In each season the data were separated in 13 AOD cases (0.1 AOD 500nm steps until AOD higher than 1.6). The studied optical properties include single scattering albedo, complex refractive index, asymmetric factor, column water vapor, volume size distribution, radiative forcing and forcing efficiency. A comparison was made too with model based on single scattering albedo instead optical depth. These results contribute to a better regional parameterization used in look up tables such as from MODIS and regional models of transport and dispersion of pollutants.

Science Theme:  TG (Trace Gases)

Presentation Type:  Poster

Abstract ID: 89

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