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DOI10.1073/pnas.2012218117
Quantification of organic aerosol and brown carbon evolution in fresh wildfire plumes
Palm B.B.; Peng Q.; Fredrickson C.D.; Lee B.H.; Garofalo L.A.; Pothier M.A.; Kreidenweis S.M.; Farmer D.K.; Pokhrel R.P.; Shen Y.; Murphy S.M.; Permar W.; Hu L.; Campos T.L.; Hall S.R.; Ullmann K.; Zhang X.; Flocke F.; Fischer E.V.; Thornton J.A.
发表日期2020
ISSN0027-8424
起始页码29469
结束页码29477
卷号117期号:47
英文摘要The evolution of organic aerosol (OA) and brown carbon (BrC) in wildfire plumes, including the relative contributions of primary versus secondary sources, has been uncertain in part because of limited knowledge of the precursor emissions and the chemical environment of smoke plumes. We made airborne measurements of a suite of reactive trace gases, particle composition, and optical properties in fresh western US wildfire smoke in July through August 2018. We use these observations to quantify primary versus secondary sources of biomass-burning OA (BBPOA versus BBSOA) and BrC in wildfire plumes. When a daytime wildfire plume dilutes by a factor of 5 to 10, we estimate that up to onethird of the primary OA has evaporated and subsequently reacted to form BBSOA with near unit yield. The reactions of measured BBSOA precursors contribute only 13 ± 3% of the total BBSOA source, with evaporated BBPOA comprising the rest. We find that oxidation of phenolic compounds contributes the majority of BBSOA from emitted vapors. The corresponding particulate nitrophenolic compounds are estimated to explain 29 ± 15% of average BrC light absorption at 405 nm (BrC Abs405) measured in the first few hours of plume evolution, despite accounting for just 4 ± 2% of average OA mass. These measurements provide quantitative constraints on the role of dilution-driven evaporation of OA and subsequent radical-driven oxidation on the fate of biomass-burning OA and BrC in daytime wildfire plumes and point to the need to understand how processing of nighttime emissions differs. © 2020 National Academy of Sciences. All rights reserved.
英文关键词Aircraft measurements; Biomass burning; Brown carbon; Phenolic compounds; Secondary organic aerosol
语种英语
来源期刊Proceedings of the National Academy of Sciences of the United States of America
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/160197
作者单位Palm, B.B., Department of Atmospheric Sciences, University of Washington, Seattle, WA 98195, United States; Peng, Q., Department of Atmospheric Sciences, University of Washington, Seattle, WA 98195, United States; Fredrickson, C.D., Department of Atmospheric Sciences, University of Washington, Seattle, WA 98195, United States; Lee, B.H., Department of Atmospheric Sciences, University of Washington, Seattle, WA 98195, United States; Garofalo, L.A., Department of Chemistry, Colorado State University, Fort Collins, CO 80523, United States; Pothier, M.A., Department of Chemistry, Colorado State University, Fort Collins, CO 80523, United States; Kreidenweis, S.M., Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80523, United States; Farmer, D.K., Department of Chemistry, Colorado State University, Fort Collins, CO 80523, United States; Pokhrel, R.P., Department of Atmospheric Science, University of Wyoming, Laramie, WY 82071, United States; Shen, Y., Department of Atmosp...
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Palm B.B.,Peng Q.,Fredrickson C.D.,et al. Quantification of organic aerosol and brown carbon evolution in fresh wildfire plumes[J],2020,117(47).
APA Palm B.B..,Peng Q..,Fredrickson C.D..,Lee B.H..,Garofalo L.A..,...&Thornton J.A..(2020).Quantification of organic aerosol and brown carbon evolution in fresh wildfire plumes.Proceedings of the National Academy of Sciences of the United States of America,117(47).
MLA Palm B.B.,et al."Quantification of organic aerosol and brown carbon evolution in fresh wildfire plumes".Proceedings of the National Academy of Sciences of the United States of America 117.47(2020).
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