| Texto completo | |
| Autor(es): Mostrar menos - |
Isaacman-VanWertz, Gabriel
;
Yee, Lindsay D.
;
Kreisberg, Nathan M.
;
Wernis, Rebecca
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Moss, Joshua A.
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Hering, Susanne V.
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de Sa, Suzane S.
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Martin, Scot T.
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Alexander, M. Lizabeth
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Palm, Brett B.
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Hu, Weiwei
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Campuzano-Jost, Pedro
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Day, Douglas A.
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Jimenez, Jose L.
;
Riva, Matthieu
;
Surratte, Jason D.
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Viegas, Juarez
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Manzi, Antonio
;
Edgerton, Eric
;
Baumann, Karsten
;
Souza, Rodrigo
;
Artaxo, Paulo
;
Goldstein, Allen H.
Número total de Autores: 23
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| Tipo de documento: | Artigo Científico |
| Fonte: | Environmental Science & Technology; v. 50, n. 18, p. 9952-9962, SEP 20 2016. |
| Citações Web of Science: | 36 |
| Resumo | |
Exchange of atmospheric organic compounds between gas and particle phases is important in the production and chemistry of particle-phase mass but is poorly understood due to a lack of simultaneous measurements in both phases of individual compounds. Measurements of particle- and gas phase organic compounds are reported here for the southeastern United States and central Amazonia. Polyols formed from isoprene oxidation contribute 8% and 15% on average to particle-phase organic mass at these sites but are also observed to have substantial gas-phase concentrations contrary to many models that treat these compounds as nonvolatile. The results of the present study show that the gas-particle partitioning of approximately 100 known and newly observed oxidation products is not well explained by environmental factors (e.g., temperature). Compounds having high vapor pressures have higher particle fractions than expected from absorptive equilibrium partitioning models. These observations support the conclusion that many commonly measured biogenic oxidation products may be bound in low-volatility mass (e.g., accretion products, inorganic organic adducts) that decomposes to individual compounds on analysis. However, the nature and extent of any such bonding remains uncertain. Similar conclusions are reach for both study locations, and average particle fractions for a given compound are consistent within similar to 25% across measurement sites. (AU) | |
| Processo FAPESP: | 13/05014-0 - GoAmazon: interação da pluma urbana de Manaus com emissões biogênicas da Floresta Amazônica |
| Beneficiário: | Paulo Eduardo Artaxo Netto |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático |