edu.ucar.opensky::articles:24488 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-24T23:10:42.016627 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7ms3x56 Emissions of trace organic gases from western U.S. wildfires based on WE-CAN aircraft measurements 2021-06-16T00:00:00Z publication https://n2t.org/ark:/85065/d7ms3x56 https://doi.org/10.1029/2020JD033838 Permar, W. author Wang, Q. author Selimovic, V. author Wielgasz, C. author Yokelson, R. J. author Hornbrook, Rebecca author Hills, Alan J. author Apel, Eric C. author Ku, I. author Zhou, Y. author Sive, B. C. author Sullivan, A. P. author Collett, J. L. author Campos, Teresa author Palm, B. B. author Peng, Q. author Thornton, J. A. author Garofalo, L. A. author Farmer, D. K. author Kreidenweis, S. M. author Levin, E. J. T. author DeMott, P. J. author Flocke, Frank M. author Fischer, E. V. author Hu, L. author UCAR/NCAR - Library publisher We present emission measurements of volatile organic compounds (VOCs) for western U.S. wildland fires made on the NSF/NCAR C-130 research aircraft during the Western Wildfire Experiment for Cloud Chemistry, Aerosol Absorption, and Nitrogen (WE-CAN) field campaign in summer 2018. VOCs were measured with complementary instruments onboard the C-130, including a proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS) and two gas chromatography (GC)-based methods. Agreement within combined instrument uncertainties (<60%) was observed for most co-measured VOCs. GC-based measurements speciated the isomeric contributions to selected PTR-ToF-MS ion masses and generally showed little fire-to-fire variation. We report emission ratios (ERs) and emission factors (EFs) for 161 VOCs measured in 31 near-fire smoke plume transects of 24 specific individual fires sampled in the afternoon when burning conditions are typically most active. Modified combustion efficiency (MCE) ranged from 0.85 to 0.94. The measured campaign-average total VOC EF was 26.1 +/- 6.9 g kg(-1), approximately 67% of which is accounted for by oxygenated VOCs. The 10 most abundantly emitted species contributed more than half of the total measured VOC mass. We found that MCE alone explained nearly 70% of the observed variance for total measured VOC emissions (r(2) = 0.67) and >50% for 57 individual VOC EFs representing more than half the organic carbon mass. Finally, we found little fire-to-fire variability for the mass fraction contributions of individual species to the total measured VOC emissions, suggesting that a single speciation profile can describe VOC emissions for the wildfires in coniferous ecosystems sampled during WE-CAN. 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 2021 American Geophysical Union. None eng geoscientificInformation