Climatic effects of aerosols i...

Climatic effects of aerosols in Amazonia

Aerosol particles are a critical ingredient in the functioning of Amazonian ecosystem. It control cloud properties, radiative balance, nutrient cycling and other important ecosystem functions. In terms of radiative forcing, aerosols from biomass burning can provide a negative forcing of -300 watts/m2, instantaneously, with an average of 7 years of -38 watts/m2. This is a very high forcing, and have important impacts on carbon uptake by the ecosystem. Aerosols increase the diffuse radiation and plants make photosynthesis more efficiently in forests with larger fraction of diffuse radiation. For high amounts of aerosols, photosynthesis is basically shut down. Aerosols from biomass burning also makes efficient cloud condensation nuclei that alters could microphysics very significantly. It was observed an increase in cloud cover from 25 to 60% when aerosol loading increases the Aerosol Optical Depth (AOD) from 0.1 to 0.7.
We will report long term detailed aerosol measurements 2008 to 2011 as part of the FAPESP AEROCLIMA (Direct and indirect effects of aerosols on climate in Amazonia and Pantanal) project. The dataset obtained encompass the first long term aerosol measurements ever performed in Amazonia, elucidating the differences between the biogenic aerosol population naturally released by the forest metabolism and the anthropogenic aerosols brought to the ecosystem by outer sources as well as regional  biomass burning emissions. These data helps to link climatic effects of aerosols with optical, chemical and physical measurements.

Presentation Type: 
Invited Presentation
Author 1: 
Paulo Artaxo
Author 2: 
Luciana Rizzo
Author 3: 
Kenia Wiedemann
Author 4: 
Samuel P. Camara
Author 5: 
Melina Paixão
Author 6: 
Samuel P. Camara
Author 7: 
Micael cecchini
Author 8: 
Andrea Arana
Author 9: 
Silvia Lucca
Additional Authors: 
no more authors
Author Roles
Corresponding Author: 
Paulo Artaxo
Presenting Author: 
Paulo Artaxo