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Environ Sci Technol

Title:		Variability and Time of Day Dependence of Ozone Photochemistry in Western Wildfire Plumes
Author(s):		Robinson MA; Decker ZCJ; Barsanti KC; Coggon MM; Flocke FM; Franchin A; Fredrickson CD; Gilman JB; Gkatzelis GI; Holmes CD; Lamplugh A; Lavi A; Middlebrook AM; Montzka DM; Palm BB; Peischl J; Pierce B; Schwantes RH; Sekimoto K; Selimovic V; Tyndall GS; Thornton JA; Van Rooy P; Warneke C; Weinheimer AJ; Brown SS;
Address:		"NOAA Chemical Sciences Laboratory, Boulder, Colorado 80305, United States. Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, Colorado 80309, United States. Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309, United States. Department of Chemical and Environmental Engineering and College of Engineering-Center for Environmental Research and Technology (CE-CERT), University of California, Riverside, Riverside, California 92507, United States. Atmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80301, United States. Department of Atmospheric Sciences, University of Washington, Seattle, Washington 98195, United States. Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, Florida 32306, United States. Space Science and Engineering Center, University of Wisconsin-Madison, Madison, Wisconsin 53715, United States. Graduate School of Nanobioscience, Yokohama City University, Yokohama, Kanagawa 236-0027, Japan. Department of Chemistry and Biochemistry, University of Montana, Missoula, Montana 59812, United States"
Journal Title:		Environ Sci Technol
Year:		2021
Volume:		20210713
Issue:		15
Page Number:		10280 - 10290
DOI:		10.1021/acs.est.1c01963
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"Understanding the efficiency and variability of photochemical ozone (O(3)) production from western wildfire plumes is important to accurately estimate their influence on North American air quality. A set of photochemical measurements were made from the NOAA Twin Otter research aircraft as a part of the Fire Influence on Regional to Global Environments and Air Quality (FIREX-AQ) experiment. We use a zero-dimensional (0-D) box model to investigate the chemistry driving O(3) production in modeled plumes. Modeled afternoon plumes reached a maximum O(3) mixing ratio of 140 +/- 50 ppbv (average +/- standard deviation) within 20 +/- 10 min of emission compared to 76 +/- 12 ppbv in 60 +/- 30 min in evening plumes. Afternoon and evening maximum O(3) isopleths indicate that plumes were near their peak in NO(x) efficiency. A radical budget describes the NO(x) volatile - organic compound (VOC) sensitivities of these plumes. Afternoon plumes displayed a rapid transition from VOC-sensitive to NO(x)-sensitive chemistry, driven by HO(x) (=OH + HO(2)) production from photolysis of nitrous acid (HONO) (48 +/- 20% of primary HO(x)) and formaldehyde (HCHO) (26 +/- 9%) emitted directly from the fire. Evening plumes exhibit a slower transition from peak NO(x) efficiency to VOC-sensitive O(3) production caused by a reduction in photolysis rates and fire emissions. HO(x) production in evening plumes is controlled by HONO photolysis (53 +/- 7%), HCHO photolysis (18 +/- 9%), and alkene ozonolysis (17 +/- 9%)"
Keywords:		*Air Pollutants/analysis *Air Pollution/analysis Environmental Monitoring *Ozone/analysis Photochemistry *Wildfires atmospheric chemistry biomass oxidation photodissociation volatile organic compounds;
Notes:		"MedlineRobinson, Michael A Decker, Zachary C J Barsanti, Kelley C Coggon, Matthew M Flocke, Frank M Franchin, Alessandro Fredrickson, Carley D Gilman, Jessica B Gkatzelis, Georgios I Holmes, Christopher D Lamplugh, Aaron Lavi, Avi Middlebrook, Ann M Montzka, Denise M Palm, Brett B Peischl, Jeff Pierce, Brad Schwantes, Rebecca H Sekimoto, Kanako Selimovic, Vanessa Tyndall, Geoffrey S Thornton, Joel A Van Rooy, Paul Warneke, Carsten Weinheimer, Andrew J Brown, Steven S eng Research Support, U.S. Gov't, Non-P.H.S. 2021/07/14 Environ Sci Technol. 2021 Aug 3; 55(15):10280-10290. doi: 10.1021/acs.est.1c01963. Epub 2021 Jul 13"