Ozone chemistry in western U.S. wildfire plumes

Lu Xu, John D. Crounse, Krystal T. Vasquez, Hannah Allen, Paul O. Wennberg, Ilann Bourgeois, Steven S. Brown, Pedro Campuzano-Jost, Matthew M. Coggon, James H. Crawford, Joshua P. DiGangi, Glenn S. Diskin, Alan Fried, Emily M. Gargulinski, Jessica B. Gilman, Georgios I. Gkatzelis, Hongyu Guo, Johnathan W. Hair, Samuel R. Hall, Hannah A. HallidayThomas F. Hanisco, Reem A. Hannun, Christopher D. Holmes, L. Gregory Huey, Jose L. Jimenez, Aaron Lamplugh, Young Ro Lee, Jin Liao, Jakob Lindaas, J. Andrew Neuman, John B. Nowak, Jeff Peischl, David A. Peterson, Felix Piel, Dirk Richter, Pamela S. Rickly, Michael A. Robinson, Andrew W. Rollins, Thomas B. Ryerson, Kanako Sekimoto, Vanessa Selimovic, Taylor Shingler, Amber J. Soja, Jason M.S. Clair, David J. Tanner, Kirk Ullmann, Patrick R. Veres, James Walega, Carsten Warneke, Rebecca A. Washenfelder, Petter Weibring, Armin Wisthaler, Glenn M. Wolfe, Caroline C. Womack, Robert J. Yokelson

Research output: Contribution to journalArticlepeer-review

53 Scopus citations


Wildfires are a substantial but poorly quantified source of tropospheric ozone (O3). Here, to investigate the highly variable O3 chemistry in wildfire plumes, we exploit the in situ chemical characterization of western wildfires during the FIREX-AQ flight campaign and show that O3 production can be predicted as a function of experimentally constrained OH exposure, volatile organic compound (VOC) reactivity, and the fate of peroxy radicals. The O3 chemistry exhibits rapid transition in chemical regimes. Within a few daylight hours, the O3 formation substantially slows and is largely limited by the abundance of nitrogen oxides (NOx). This finding supports previous observations that O3 formation is enhanced when VOC-rich wildfire smoke mixes into NOx-rich urban plumes, thereby deteriorating urban air quality. Last, we relate O3 chemistry to the underlying fire characteristics, enabling a more accurate representation of wildfire chemistry in atmospheric models that are used to study air quality and predict climate.

Original languageEnglish
Article numberabl3648
JournalScience advances
Issue number50
StatePublished - Dec 2021


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