10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Scattering and Absorption Properties of Aerosols in Amazonia Using Remote Sensing (AERONET) and in situ Measurements
FERNANDO MORAIS, Eduardo Landulfo, Paulo Artaxo, University of Sao Paulo
Abstract Number: 124 Working Group: Aerosols in Earth System
Abstract Optical properties of aerosols in Amazonia have been measured over the last 18 years at 8 AERONET sites using CIMEL sunphotometers. Ground based measurements of scattering using TSI and Ecotech three wavelength nephelometers were performed in several sites in Central and Southeast Amazonia. Absorption was measured with Multi-angle Absorption Photometers (MAAP) model 5012 from Thermo Enviroment and AE33 Aethalometers from Magee Scientific. Black carbon was also measured in Nuclepore filters collected in Stacked Filter Units. Measurements were done in Central Amazonia (Manaus ZF2, Manaus EMBRAPA and ATTO tower), as well as in Rio Branco, Porto Velho, Ji Paraná, Santarem and Alta Floresta.
Results shows important geographical and seasonal variability, with 5 main aerosol components: natural biogenic primary aerosol particles, biogenic secondary organic aerosols, biomass burning, long range transported from Africa and urban component. Scattering and absorption Angstrom coefficients helps in separating these different components. Dry and wet season shows very different aerosol characteristics. Very low AOD (ATTO Average = 0.08 ± 0.04) at 500 nm is observed in the wet season, while AOD (ATTO Average = 0.20 ± 0.12, but can reach AOD 3-4 at Alta Floresta and Ji-Paraná) at 500 nm observed in the dry season in Southwestern Amazonia.