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© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  19 Nov 2020

19 Nov 2020

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This preprint is currently under review for the journal ACP.

Aerosols from anthropogenic and biogenic sources and their interactions: modeling aerosol formation, optical properties and impacts over the central Amazon Basin

Janaína P. Nascimento1, Megan M. Bela5,6, Bruno Meller2, Alessandro L. Banducci8, Luciana V. Rizzo7, Angel Liduvino Vara-Vela4, Henrique M. J. Barbosa2, Helber Gomes9,10, Sameh A. A. Rafee3, Marco A. Franco2, Samara Carbone11,2, Glauber G. Cirino12, Rodrigo A. F. Souza1, Stuart A. McKeen5,6, and Paulo Artaxo2 Janaína P. Nascimento et al.
  • 1Post-graduate Program in Climate and Environment (CLIAMB), National Institute for Amazonian Research and Amazonas State University, Manaus, AM, Brazil
  • 2Institute of Physics, University of Sao Paulo, Sao Paulo, SP, Brazil
  • 3Department of Atmospheric Sciences, Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, SP, Brazil
  • 4Center for Weather Forecasting and Climate Studies, National Institute for Space Research, Cachoeira Paulista, Sao Paulo, SP, Brazil
  • 5Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
  • 6NOAA Earth System Research Laboratory, Boulder, CO, USA
  • 7Department of Environmental Sciences, Institute of Environmental, Chemical and Pharmaceutics Sciences, Federal University of Sao Paulo, Sao Paulo, SP, Brazil
  • 8Department of Physics, Colorado State University, Fort Collins, CO, USA
  • 9Institute of Atmospheric Sciences, Federal University of Alagoas, Maceió, AL, Brazil
  • 10Department of Meteorology, Federal University of Campina Grande, Campina Grande, Brazil, PB, Brazil
  • 11Federal University of Uberlândia, Uberlândia, MG, Brazil
  • 12Department of Meteorology, Geosciences Institute, Federal University of Pará, PA, Brazil

Abstract. The Green Ocean Amazon experiment – GoAmazon2014/5 explored the interactions between natural biogenic forest emissions from Central Amazonia and urban air pollution from Manaus. Previous GoAmazon2014/5 studies showed that nitrogen oxides (NOx = NO + NO2) and sulfur oxides (SOx) emissions from Manaus strongly interact with biogenic volatile organic compounds (BVOCs), affecting secondary organic aerosol (SOA) formation. In previous studies, ground based and aircraft measurements provided evidence of SOA formation and strong changes in aerosol composition and properties. Aerosol optical properties also evolve, and their impacts on the Amazonian ecosystem can be significant. As particles age, some processes such as SOA production, black carbon (BC) deposition, particle growth, and the BC lensing effect change the aerosol optical properties, affecting the solar radiation flux at the surface. This study analyzes data and models SOA formation using the Weather Research and Forecasting with Chemistry (WRF-Chem) model to assess the spatial variability of aerosol optical properties as the Manaus plumes interact with the natural atmosphere. The following aerosol optical properties are investigated: single scattering albedo (SSA), asymmetry parameter (gaer), absorption Ångström exponent (AAE), and scattering Ångström exponent (SAE). These simulations were validated using ground based measurements at three experimental sites: Amazon Tall Tower Observatory – ATTO (T0a), downtown Manaus (T1), Tiwa Hotel (T2) and Manacapuru (T3), as well as the G1 aircraft flights. WRF-Chem simulations were performed over seven days during March 2014. Results show a mean biogenic SOA (BSOA) mass enrichment of 512 % at the T1 site, 450 % in regions downwind of Manaus such as the T3 site and 850 % in areas north of the T3 site in simulations with anthropogenic emissions. The SOA formation is rather fast, with about 80 % of the SOA mass produced in 3–4 hours. Comparing the plume from simulations with and without anthropogenic emissions, SSA shows a downwind reduction of approximately 10 %, 11 % and 6 % at the T1, T2 and T3 sites, respectively. Other regions, such as those further downwind of the T3 site, are also affected. Gaer values increased from 0.62 to 0.74 at the T1 site and from 0.67 to 0.72 at the T3 site when anthropogenic emissions are active. During the Manaus plume aging process, a plume tracking analysis shows an increase in SSA from 0.91 close to Manaus to 0.98 160 km downwind of Manaus as a result of SOA production and BC deposition.

Janaína P. Nascimento et al.

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Janaína P. Nascimento et al.

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