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Environ Sci Technol

Title:		Oxygenated Aromatic Compounds are Important Precursors of Secondary Organic Aerosol in Biomass-Burning Emissions
Author(s):		Akherati A; He Y; Coggon MM; Koss AR; Hodshire AL; Sekimoto K; Warneke C; de Gouw J; Yee L; Seinfeld JH; Onasch TB; Herndon SC; Knighton WB; Cappa CD; Kleeman MJ; Lim CY; Kroll JH; Pierce JR; Jathar SH;
Address:		"Department of Mechanical Engineering, Colorado State University, Fort Collins 80525, Colorado, United States. Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder 80309, Colorado, United States. Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder 80305, Colorado, United States. Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Boston 02139, Massachusetts, United States. Department of Atmospheric Science, Colorado State University, Fort Collins 80525, Colorado, United States. Department of Chemistry and Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder 80309, Colorado, United States. Environmental Science, Policy, and Management, University of California Berkeley, Berkeley 94720-3114, California, United States. Department of Chemical Engineering, California Institute of Technology, Pasadena 91125, California, United States. Aerodyne Research Inc., Billerica 01821, Massachusetts, United States. Department of Chemistry, Montana State University, Bozeman 59717, Montana, United States. Department of Civil and Environmental Engineering, University of California Davis, Davis 95616, California, United States"
Journal Title:		Environ Sci Technol
Year:		2020
Volume:		20200706
Issue:		14
Page Number:		8568 - 8579
DOI:		10.1021/acs.est.0c01345
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"Biomass burning is the largest combustion-related source of volatile organic compounds (VOCs) to the atmosphere. We describe the development of a state-of-the-science model to simulate the photochemical formation of secondary organic aerosol (SOA) from biomass-burning emissions observed in dry (RH <20%) environmental chamber experiments. The modeling is supported by (i) new oxidation chamber measurements, (ii) detailed concurrent measurements of SOA precursors in biomass-burning emissions, and (iii) development of SOA parameters for heterocyclic and oxygenated aromatic compounds based on historical chamber experiments. We find that oxygenated aromatic compounds, including phenols and methoxyphenols, account for slightly less than 60% of the SOA formed and help our model explain the variability in the organic aerosol mass (R(2) = 0.68) and O/C (R(2) = 0.69) enhancement ratios observed across 11 chamber experiments. Despite abundant emissions, heterocyclic compounds that included furans contribute to approximately 20% of the total SOA. The use of pyrolysis-temperature-based or averaged emission profiles to represent SOA precursors, rather than those specific to each fire, provide similar results to within 20%. Our findings demonstrate the necessity of accounting for oxygenated aromatics from biomass-burning emissions and their SOA formation in chemical mechanisms"
Keywords:		Aerosols/analysis *Air Pollutants/analysis Atmosphere Biomass Photochemical Processes *Volatile Organic Compounds/analysis;
Notes:		"MedlineAkherati, Ali He, Yicong Coggon, Matthew M Koss, Abigail R Hodshire, Anna L Sekimoto, Kanako Warneke, Carsten de Gouw, Joost Yee, Lindsay Seinfeld, John H Onasch, Timothy B Herndon, Scott C Knighton, Walter B Cappa, Christopher D Kleeman, Michael J Lim, Christopher Y Kroll, Jesse H Pierce, Jeffrey R Jathar, Shantanu H eng Research Support, U.S. Gov't, Non-P.H.S. 2020/06/20 Environ Sci Technol. 2020 Jul 21; 54(14):8568-8579. doi: 10.1021/acs.est.0c01345. Epub 2020 Jul 6"