Use este identificador para citar ou linkar para este item: https://repositorio.inpa.gov.br/handle/1/23279
Título: Natural and Anthropogenically Influenced Isoprene Oxidation in Southeastern United States and Central Amazon
Autor: Yee, Lindsay D.
Isaacman-VanWertz, Gabriel A.
Wernis, Rebecca A.
Kreisberg, Nathan M.
Glasius, Marianne
Riva, Matthieu
Surratt, Jason D.
Sá, Suzane S. de
Martin, Scot T.
Alexander, Michael Lizabeth
Palm, Brett B.
Hu, Weiwei
Campuzano-Jost, Pedro
Day, Douglas A.
Ji?enez, José Luis
Liu, Yingjun
Misztal, Pawel K.
Artaxo, Paulo
Viegas, Juarez
Manzi, Antônio Ocimar
Souza, Rodrigo Augusto Ferreira de
Edgerton, Eric S.
Baumann, Karsten
Goldstein, Allen H.
Palavras-chave: Aerosols
Olefins
Sulfur Compounds
Tracers
2-methylglyceric acid
Anthropogenic emissions
Anthropogenic influence
Forested environment
Particulate sulfates
Secondary Organic Aerosols
Three orders of magnitude
Wet And Dry Seasons
Isoprene
Alkene
Isoprene
Nitrate
Sulfate
Tracer
Water
Aerosol
Anthropogenic Source
Concentration (composition)
desorption
Dry Season
Industrial Emission
Isoprene
Nitrate
Oxidation
Particulate Matter
Sulfate
Tracer
Wet Season
Acidity
Air Pollution
Air Quality
Air Temperature
Amazonas [Brazil]
atmospheric dispersion
Comparative Study
Concentration (parameter)
desorption
Dry Season
Forest
Gas Chromatography
Humidity
Oxidation
Ph
Plume
rainy season
Secondary Organic Aerosol
Summer
United States
Water Content
wet deposition
Amazonia
United States
en
Data do documento: 2020
Revista: Environmental Science and Technology
Encontra-se em: Volume 54, Número 10, Pags. 5980-5991
Abstract: Anthropogenic emissions alter secondary organic aerosol (SOA) formation chemistry from naturally emitted isoprene. We use correlations of tracers and tracer ratios to provide new perspectives on sulfate, NOx, and particle acidity influencing isoprene-derived SOA in two isoprene-rich forested environments representing clean to polluted conditions-wet and dry seasons in central Amazonia and Southeastern U.S. summer. We used a semivolatile thermal desorption aerosol gas chromatograph (SV-TAG) and filter samplers to measure SOA tracers indicative of isoprene/HO2 (2-methyltetrols, C5-alkene triols, 2-methyltetrol organosulfates) and isoprene/NOx (2-methylglyceric acid, 2-methylglyceric acid organosulfate) pathways. Summed concentrations of these tracers correlated with particulate sulfate spanning three orders of magnitude, suggesting that 1 μg m-3 reduction in sulfate corresponds with at least âˆ0.5 μg m-3 reduction in isoprene-derived SOA. We also find that isoprene/NOx pathway SOA mass primarily comprises organosulfates, âˆ97% in the Amazon and âˆ55% in Southeastern United States. We infer under natural conditions in high isoprene emission regions that preindustrial aerosol sulfate was almost exclusively isoprene-derived organosulfates, which are traditionally thought of as representative of an anthropogenic influence. We further report the first field observations showing that particle acidity correlates positively with 2-methylglyceric acid partitioning to the gas phase and negatively with the ratio of 2-methyltetrols to C5-alkene triols. © 2020 American Chemical Society.
DOI: 10.1021/acs.est.0c00805
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