A224-0005
Modified combustion efficiency and trace gas ratios during the 2019 FIREX-AQ Field Measurement Campaign

Wednesday, 16 December 2020
Poster
Hannah S Halliday1, Glenn S Diskin2, Joshua P DiGangi3, John B Nowak3, Yonghoon Choi3, Mario Rana3, Alan Fried4 and Elizabeth Brooke Wiggins3, (1)US Environmental Protection Agency Research Triangle Park, Durham, NC, United States, (2)NASA Langley Research Ctr, Hampton, VA, United States, (3)NASA Langley Research Center, Hampton, VA, United States, (4)University of Colorado at Boulder, Institute of Arctic and Alpine Research, Boulder, CO, United States
Abstract:
In-situ trace gas ratios are commonly used to characterize smoke plumes, including the modified combustion efficiency (MCE) and enhancement ratios that can be used in the calculation of emission factors. High frequency airborne data (1hz and 5hz) collected during the 2019 FIREX-AQ field campaign is used to calculate trace gas ratios for individual fires plume transects and as a rolling calculation. We evaluate two methods for calculating MCE from trace gas measurements of CO and CO2 and apply the stronger approach to an investigation of how fire and sampling conditions can affect MCE values. This was done by sorting the MCE and trace gas ratios during the campaign according to fuel sources and fire characteristics, such as fire radiative power (FRP). Finally, the rolling calculations of MCE are used to investigate instances of MCE non-homogeneity within individual wildland fire smoke plume transects.
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