edu.ucar.opensky::articles:27071 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-24T18:56:33.545604 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7wm1jk1 Parameterizations of US wildfire and prescribed fire emission ratios and emission factors based on FIREX-AQ aircraft measurements 2024-01-23T00:00:00Z publication https://n2t.org/ark:/85065/d7wm1jk1 https://doi.org/10.5194/acp-24-929-2024 Gkatzelis, G. I. author Coggon, M. M. author Stockwell, C. E. author Hornbrook, Rebecca author Allen, H. author Apel, Eric C. author Bela, M. M. author Blake, D. R. author Bourgeois, I. author Brown, S. S. author Campuzano-Jost, P. author St. Clair, J. M. author Crawford, J. H. author Crounse, J. D. author Day, D. A. author DiGangi, J. P. author Diskin, G. S. author Fried, A. author Gilman, J. B. author Guo, H. author Hair, J. W. author Halliday, H. S. author Hanisco, T. F. author Hannun, R. author Hills, Alan J. author Huey, L. G. author Jimenez, J. L. author Katich, J. M. author Lamplugh, A. author Lee, Y. R. author Liao, J. author Lindaas, J. author McKeen, S. A. author Mikoviny, T. author Nault, B. A. author Neuman, J. A. author Nowak, J. B. author Pagonis, D. author Peischl, J. author Perring, A. E. author Piel, F. author Rickly, P. S. author Robinson, M. A. author Rollins, A. W. author Ryerson, T. B. author Schueneman, M. K. author Schwantes, R. H. author Schwarz, J. P. author Sekimoto, K. author Selimovic, V. author Shingler, T. author Tanner, D. J. author Tomsche, L. author Vasquez, K. T. author Veres, Patrick author Washenfelder, R. author Weibring, P. author Wennberg, P. O. author Wisthaler, A. author Wolfe, G. M. author Womack, C. C. author Xu, L. author Ball, K. author Yokelson, R. J. author Warneke, C. author UCAR/NCAR - Library publisher Extensive airborne measurements of non-methane organic gases (NMOGs), methane, nitrogen oxides, reduced nitrogen species, and aerosol emissions from US wild and prescribed fires were conducted during the 2019 NOAA/NASA Fire Influence on Regional to Global Environments and Air Quality campaign (FIREX-AQ). Here, we report the atmospheric enhancement ratios (ERs) and inferred emission factors (EFs) for compounds measured on board the NASA DC-8 research aircraft for nine wildfires and one prescribed fire, which encompass a range of vegetation types. We use photochemical proxies to identify young smoke and reduce the effects of chemical degradation on our emissions calculations. ERs and EFs calculated from FIREX-AQ observations agree within a factor of 2, with values reported from previous laboratory and field studies for more than 80 % of the carbon- and nitrogen-containing species. Wildfire emissions are parameterized based on correlations of the sum of NMOGs with reactive nitrogen oxides (NO y ) to modified combustion efficiency (MCE) as well as other chemical signatures indicative of flaming/smoldering combustion, including carbon monoxide (CO), nitrogen dioxide (NO 2 ), and black carbon aerosol. The sum of primary NMOG EFs correlates to MCE with an R 2 of 0.68 and a slope of - 296 +/- 51 g kg - 1 , consistent with previous studies. The sum of the NMOG mixing ratios correlates well with CO with an R 2 of 0.98 and a slope of 137 +/- 4 ppbv of NMOGs per parts per million by volume (ppmv) of CO, demonstrating that primary NMOG emissions can be estimated from CO. Individual nitrogen-containing species correlate better with NO 2 , NO y , and black carbon than with CO. More than half of the NO y in fresh plumes is NO 2 with an R 2 of 0.95 and a ratio of NO 2 to NO y of 0.55 +/- 0.05 ppbv ppbv - 1 , highlighting that fast photochemistry had already occurred in the sampled fire plumes. The ratio of NO y to the sum of NMOGs follows trends observed in laboratory experiments and increases exponentially with MCE, due to increased emission of key nitrogen species and reduced emission of NMOGs at higher MCE during flaming combustion. These parameterizations will provide more accurate boundary conditions for modeling and satellite studies of fire plume chemistry and evolution to predict the downwind formation of secondary pollutants, including ozone and secondary organic aerosol. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. None eng geoscientificInformation