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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 |
É parte de: | 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 |
Aparece nas coleções: | Artigos |
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