| Title: | Major Regional-Scale Production of O(3) and Secondary Organic Aerosol in Remote Amazon Regions from the Dynamics and Photochemistry of Urban and Forest Emissions |
| Author(s): | Nascimento JP; Barbosa HMJ; Banducci AL; Rizzo LV; Vara-Vela AL; Meller BB; Gomes H; Cezar A; Franco MA; Ponczek M; Wolff S; Bela MM; Artaxo P; |
| Address: | "National Institute for Amazonian Research, Manaus, AM 69.060-000, Brazil. Amazonas State University, Manaus, AM 69470000, Brazil. NOAA Global Systems Laboratory, Boulder, Colorado 80305, United States. Institute of Physics, University of Sao Paulo, Sao Paulo, SP 05508-090, Brazil. Department of Physics, Colorado State University, Fort Collins, Colorado 80523, United States. Department of Environmental Sciences, Institute of Environmental, Chemical and Pharmaceutical Sciences, Federal University of Sao Paulo, Sao Paulo, SP 09913-030, Brazil. Department of Atmospheric Sciences, Institute of Astronomy, Geophysics and Atmospheric Sciences, University of Sao Paulo, Sao Paulo 05508-090, Brazil. Federal University of Technology, Londrina, Puerto Rico 86047-125, Brazil. Institute of Atmospheric Sciences, Federal University of Alagoas, Maceio, Alabama 57072-900, Brazil. Department of Meteorology, Federal University of Campina Grande, Campina Grande, PB 58428-830, Brazil. Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz 55128, Germany. NOAA Chemical Sciences Laboratory, Boulder, Colorado 80305, United States" |
| ISSN/ISBN: | 1520-5851 (Electronic) 0013-936X (Linking) |
| Abstract: | "The Amazon rainforest suffers increasing pressure from anthropogenic activities. A key aspect not fully understood is how anthropogenic atmospheric emissions within the basin interact with biogenic emissions and impact the forest's atmosphere and biosphere. We combine a high-resolution atmospheric chemical transport model with an improved emissions inventory and in-situ measurements to investigate a surprisingly high concentration of ozone (O(3)) and secondary organic aerosol (SOA) 150-200 km downwind of Manaus city in an otherwise pristine forested region. We show that atmospheric dynamics and photochemistry determine a gross production of secondary pollutants seen in the simulation. After sunrise, the erosion of the nocturnal boundary layer mixes natural forest emissions, rich in biogenic volatile organic compounds, with a lofted pollution layer transported overnight, rich in nitrogen oxides and formaldehyde. As a result, O(3) and SOA concentrations greater than approximately 47 ppbv and 1.8 mug m(-3), respectively, were found, with maximum concentrations occurring at 2 pm LT, 150-200 km downwind of Manaus city. These high concentrations affect a large primary forested area of about 11,250 km(2). These oxidative areas are under a NOx-limited regime so that changes in NOx emissions from Manaus have a significant impact on O(3) and SOA production" |
| Keywords: | Aerosols/analysis *Air Pollutants/analysis Environmental Monitoring/methods Forests *Ozone/analysis *Volatile Organic Compounds Amazon region atmospheric chemistry ozone secondary organic aerosol; |
| Notes: | "MedlineNascimento, Janaina P Barbosa, Henrique M J Banducci, Alessandro L Rizzo, Luciana V Vara-Vela, Angel Liduvino Meller, Bruno B Gomes, Helber Cezar, Andre Franco, Marco A Ponczek, Milena Wolff, Stefan Bela, Megan M Artaxo, Paulo eng Research Support, Non-U.S. Gov't 2022/07/09 Environ Sci Technol. 2022 Jul 19; 56(14):9924-9935. doi: 10.1021/acs.est.2c01358. Epub 2022 Jul 8" |
