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Title: Urban pollution greatly enhances formation of natural aerosols over the Amazon rainforest
Authors: Shrivastava, Manish K.
Andreae, Meinrat O.
Artaxo, Paulo
Barbosa, H. M. J.
Berg, Larry K.
Brito, Joel F.
Ching, Joseph
Easter, Richard C.
Fan, J.
Fast, Jerome D.
Feng, Zhe
Fuentes, José D.
Glasius, Marianne
Goldstein, Allen H.
Alves, Eliane Gomes
Gomes, Helber B. B.
Gu, Dasa
Guenther, Alex B.
Jathar, Shantanu H.
Kim, Saewung
Liu, Ying
Lou, Sijia
Martin, Scot T.
McNeill, V. Faye
Medeiros, Adan Sady S.
Sá, Suzane S. de
Shilling, John E.
Springston, Stephen R.
Souza, Rodrigo Augusto Ferreira de
Thornton, Joel A.
Isaacman-VanWertz, Gabriel A.
Yee, Lindsay D.
Ynoue, Rita Y.
Zaveri, Rahul A.
Zelenyuk, Alla
Zhao, Chun
Keywords: Hydroxyl Radical
Nitrogen Oxide
Organic Carbon
Peroxy Radical
Airborne Survey
Anthropogenic Source
Atmospheric Chemistry
Biogenic Emission
Energy Balance
Nitrogen Oxides
Organic Carbon
Pristine Environment
Urban Pollution
Carbon Footprint
Secondary Organic Aerosol
Urban Area
Issue Date: 2019
metadata.dc.publisher.journal: Nature Communications
metadata.dc.relation.ispartof: Volume 10, Número 1
Abstract: One of the least understood aspects in atmospheric chemistry is how urban emissions influence the formation of natural organic aerosols, which affect Earth’s energy budget. The Amazon rainforest, during its wet season, is one of the few remaining places on Earth where atmospheric chemistry transitions between preindustrial and urban-influenced conditions. Here, we integrate insights from several laboratory measurements and simulate the formation of secondary organic aerosols (SOA) in the Amazon using a high-resolution chemical transport model. Simulations show that emissions of nitrogen-oxides from Manaus, a city of ~2 million people, greatly enhance production of biogenic SOA by 60–200% on average with peak enhancements of 400%, through the increased oxidation of gas-phase organic carbon emitted by the forests. Simulated enhancements agree with aircraft measurements, and are much larger than those reported over other locations. The implication is that increasing anthropogenic emissions in the future might substantially enhance biogenic SOA in pristine locations like the Amazon. © 2019, This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply.
metadata.dc.identifier.doi: 10.1038/s41467-019-08909-4
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