Atmos. Chem. Phys., 19, 9681–9698, 2019 https://doi.org/10.5194/acp-19-9681-2019 © Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License. Gas-phase pyrolysis products emitted by prescribed fires in pine forests with a shrub understory in the southeastern United States Nicole K. Scharko1, Ashley M. Oeck1, Tanya L. Myers1, Russell G. Tonkyn1, Catherine A. Banach1, Stephen P. Baker2, Emily N. Lincoln2, Joey Chong3, Bonni M. Corcoran3, Gloria M. Burke3, Roger D. Ottmar4, Joseph C. Restaino5, David R. Weise3, and Timothy J. Johnson1 1Pacific Northwest National Laboratories, Richland, WA, USA 2USDA Forest Service, Rocky Mountain Research Station, Missoula, MT, USA 3USDA Forest Service, Pacific Southwest Research Station, Riverside, CA, USA 4USDA Forest Service, Pacific Northwest Research Station, Seattle WA, USA 5School of Environmental and Forest Sciences, University of Washington, Seattle WA, USA Correspondence: Timothy J. Johnson (
[email protected]) Received: 20 February 2019 – Discussion started: 28 March 2019 Revised: 3 July 2019 – Accepted: 4 July 2019 – Published: 1 August 2019 Abstract. In this study we identify pyrolysis gases from pre- Yokelson et al., 2013; Andreae, 1991). The primary carbon- scribed burns conducted in pine forests with a shrub under- containing gases emitted during such burns are CO2, CO, and story captured using a manual extraction device. The de- CH4, in order of decreasing concentration (Ward and Hardy, vice selectively sampled emissions ahead of the flame front, 1991). Hundreds of other trace gases have also been iden- minimizing the collection of oxidized gases, with the cap- tified in the emissions, including many non-methane volatile tured gases analyzed in the laboratory using infrared (IR) organic compounds (NMVOCs), oxygenated volatile organic absorption spectroscopy.