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Preprints
https://doi.org/10.5194/acp-2020-564
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-564
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  14 Jul 2020

14 Jul 2020

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This preprint is currently under review for the journal ACP.

Friagem Event in Central Amazon and its Influence on Micrometeorological Variables and Atmospheric Chemistry

Guilherme F. Camarinha-Neto1, Julia C. P. Cohen1,2, Cléo Q. Dias-Júnior3, Matthias Sörgel4,a, José Henrique Cattanio1,2, Alessandro Araújo5, Stefan Wolff4,b, Paulo A. F. Kuhn1, Rodrigo A. F. Souza6, Luciana V. Rizzo7, and Paulo Artaxo8 Guilherme F. Camarinha-Neto et al.
  • 1Federal University of Pará (UFPA), Postgraduate Program on Environmental Sciences - PPGCA, Belém, AM, Brazil
  • 2Faculty of Meteorology, Federal University of Pará (UFPA), Belém, PA, Brazil
  • 3Department of Physics, Federal Institute of Pará (IFPA), Belém, PA, Brazil
  • 4Biogeochemistry Department, Max Planck Institute for Chemistry, P.O. Box 3060, 55020 Mainz, Germany
  • 5Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA), Belém, PA, Brazil
  • 6Department of Meteorology, Amazonas State University (UEA), Manaus, Amazonas, Brazil
  • 7Department of Environmental Sciences, Institute of Environmental, Chemical and Pharmaceutics Sciences, UniversidadeFederal de São Paulo (UNIFESP), São Paulo, São Paulo, Brazil
  • 8Institute of Physics, University of São Paulo (USP), São Paulo, São Paulo, Brazil
  • acurrently at: Atmospheric Chemistry Department, Max Planck Institute for Chemistry, P.O. Box 3060, 55020 Mainz,Germany
  • bcurrently at: Multiphase Chemistry Department, Max Planck Institute for Chemistry, P.O. Box 3060, 55020 Mainz, Germany

Abstract. In the period between July 9th and 11th, 2014 a Friagem event reached the central Amazon region causing significant changes in microclimate and atmospheric chemistry. On July 11th, the southwest flow related to the Friagem converged with the easterly winds in the central Amazon region. The interaction between these two distinct air masses formed a convection band, which intensified over the Manaus region and the Amazon Tall Tower Observatory (ATTO) site. The satellite images show the evolution of convective activity on July 11th, which lead to 21 mm of precipitation in the ATTO site. Moreover, the arrival of the Friagem caused a sudden drop in temperature and a predominance of southerly winds, which could be seen in Porto Velho between July 7th and 8th and in Manaus and ATTO site from July 9th to 11th. The results of ERA reanalysis and Brazilian developments on the Regional Atmospheric Modeling System (BRAMS) simulations show that this Friagem event coming from the southwest, carries a mass of air with higher O3 and NO2 mixing ratios and lower CO mixing ratio compared to the air masses present at the central Amazon. At lake Balbina the Friagem intensifies the local circulations, such as the breeze phenomena. At the Manaus region and ATTO site, the main effects of the Friagem event are: a decrease in the incoming solar radiation (due to intense cloud formation), a large temperature drop and a distinct change in surface O3 and CO2 mixing ratios. As the cold air of the Friagem was just in the lower 500 m the most probable cause of this change is that a cold pool above the forest prevented vertical mixing causing accumulation of CO2 from respiration and very low O3 mixing ratio due to photochemistry reduction and limited mixing within the boundary layer.

Guilherme F. Camarinha-Neto et al.

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Guilherme F. Camarinha-Neto et al.

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Short summary
It was observed that Friagem phenomena (incursion of cold waves from the high latitudes of the Southern hemisphere to the Amazon region), very common in the dry season of the Amazon region produced significant changes in microclimate and atmospheric chemistry. Moreover, the effects of the Friagem change the surface O3 and CO2 mixing ratios and therefore interfere deeply in the microclimatic conditions and the chemical composition of the atmosphere above the rainforest.
It was observed that Friagem phenomena (incursion of cold waves from the high latitudes of the...
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