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Urban pollution greatly enhances formation of natural aerosols over the Amazon rainforest.


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.

SUBMITTER: Shrivastava M 

PROVIDER: S-EPMC6401186 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature

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Urban pollution greatly enhances formation of natural aerosols over the Amazon rainforest.

Shrivastava Manish M   Andreae Meinrat O MO   Artaxo Paulo P   Barbosa Henrique M J HMJ   Berg Larry K LK   Brito Joel J   Ching Joseph J   Easter Richard C RC   Fan Jiwen J   Fast Jerome D JD   Feng Zhe Z   Fuentes Jose D JD   Glasius Marianne M   Goldstein Allen H AH   Alves Eliane Gomes EG   Gomes Helber H   Gu Dasa D   Guenther Alex A   Jathar Shantanu H SH   Kim Saewung S   Liu Ying Y   Lou Sijia S   Martin Scot T ST   McNeill V Faye VF   Medeiros Adan A   de Sá Suzane S SS   Shilling John E JE   Springston Stephen R SR   Souza R A F RAF   Thornton Joel A JA   Isaacman-VanWertz Gabriel G   Yee Lindsay D LD   Ynoue Rita R   Zaveri Rahul A RA   Zelenyuk Alla A   Zhao Chun C  

Nature communications 20190305 1


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  ...[more]

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2021-01-31 | GSE126440 | GEO