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Discussion papers
https://doi.org/10.5194/acp-2019-167
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-167
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 07 Jun 2019

Research article | 07 Jun 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Characterization of the radiative impact of aerosols on CO2 and energy fluxes in the Amazon deforestation arch using Artificial Neural Networks

Renato Kerches Braghiere1,2,3,a, Marcia Akemi Yamasoe3, Nilton Manuel Evora do Rosario4, Humberto Ribeiro da Rocha3, José de Souza Nogueira5, and Alessandro C. de Araújo6,7 Renato Kerches Braghiere et al.
  • 1Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA, 91109, USA
  • 2Joint Institute for Regional Earth System Science and Engineering, University of California at Los Angeles, Los Angeles, CA, 90095, USA
  • 3Departamento de Ciências Atmosféricas, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, SãoPaulo, Brazil
  • 4Universidade Federal de São Paulo, Diadema, Braz
  • 5Instituto de Física, Universidade Federal de Mato Grosso, Mato Grosso, Brazil
  • 6Embrapa Amazônia Oriental, Travessa Dr. Enéas Pinheiro, s/n, Marco, Caixa Postal 48, Belém, Pará 66095-100, Brazil
  • 7Instituto Nacional de Pesquisas da Amazônia (INPA), Large Scale Biosphere-Atmosphere Experiment in Amazonia (LBA), Avenida André Araújo, 2936, Manaus, Amazonas, 69060-001, Brazil
  • acurrent address: NASA Jet Propulsion Laboratory, M/S 233-305F, 4800 Oak Grove Drive, Pasadena, CA, 2091109, USA

Abstract. In vegetation canopies with complex architectures, diffuse solar radiation can enhance carbon assimilation through photosynthesis because isotropic light is able to reach deeper layers of the canopy. Although this effect has been studied in the past decade, the mechanisms and impacts of this enhancement over South America remain poorly understood. Over the Amazon deforestation arch large amounts of aerosols are released into the atmosphere due to biomass burning, which provides an ideal scenario for further investigation of this phenomenon in the presence of canopies with complex architecture. In this paper, the relation of aerosol optical depth and surface fluxes of mass and energy are evaluated over three study sites with Artificial Neural Networks and radiative transfer modeling. Results indicate a significant effect of the aerosol on flux of carbon dioxide between the vegetation and the atmosphere, as well as on energy exchange, including that surface fluxes are sensitive to second order radiative impacts of aerosols on temperature, humidity, and friction velocity. CO2 exchanges increased in the presence of aerosol in up to 55 % in sites with complex canopy architecture. A decrease of approximately 12 % was observed for a site with shorter vegetation. Energy fluxes were negatively impacted by aerosols over all study sites.

Renato Kerches Braghiere et al.
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Renato Kerches Braghiere et al.
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Full data set - Characterization of the radiative impact of aerosols on CO2 and energy fluxes in the Amazon deforestation arch using Artificial Neural Networks R. Kerches Braghiere, M. Akemi Yamasoe, N. Manuel Evora do Rosário, H. Ribeiro da Rocha, J. de Souza Nogueira, and A. C. de Araújo https://doi.org/10.6084/m9.figshare.8239691.v1

Renato Kerches Braghiere et al.
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We evaluate how the smoke impacts heat, water and CO2 fluxes between the vegetation and the atmosphere using Artificial Neural Networks. Our results indicate an effect of the smoke on CO2 fluxes, as well as on energy and water, linking the effects of smoke with temperature, humidity, and winds. CO2 exchange increased in the presence of smoke by up to 55 %. A decrease of ~12 % was observed for a site with simpler vegetation. Energy fluxes were negatively impacted for all study sites.
We evaluate how the smoke impacts heat, water and CO2 fluxes between the vegetation and the...
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