Print Email Facebook Twitter Analyzing the Impact of Evolving Combustion Conditions on the Composition of Wildfire Emissions Using Satellite Data Title Analyzing the Impact of Evolving Combustion Conditions on the Composition of Wildfire Emissions Using Satellite Data Author Anderson, Lindsey D. (University of Colorado) Dix, Barbara (University of Colorado) Schnell, Jordan (University of Colorado; National Oceanic and Atmospheric Administration) Yokelson, Robert (University of Montana) Veefkind, j. Pepijn (TU Delft Atmospheric Remote Sensing; Royal Netherlands Meteorological Institute (KNMI)) Ahmadov, Ravan (National Oceanic and Atmospheric Administration) de Gouw, Joost (University of Colorado) Date 2023 Abstract Wildfires have become larger and more frequent because of climate change, increasing their impact on air pollution. Air quality forecasts and climate models do not currently account for changes in the composition of wildfire emissions during the commonly observed progression from more flaming to smoldering combustion. Laboratory measurements have consistently shown decreased nitrogen dioxide (NO2) relative to carbon monoxide (CO) over time, as they transitioned from more flaming to smoldering combustion, while formaldehyde (HCHO) relative to CO remained constant. Here, we show how daily ratios between column densities of NO2 versus those of CO and HCHO versus CO from the Tropospheric Monitoring Instrument (TROPOMI) changed for large wildfires in the Western United States. TROPOMI-derived emission ratios were lower than those from the laboratory. We discuss reasons for the discrepancies, including how representative laboratory burns are of wildfires, the effect of aerosols on trace gas retrievals, and atmospheric chemistry in smoke plumes. Subject air qualitybiomass burning emissionsremote sensing To reference this document use: http://resolver.tudelft.nl/uuid:863f7cb6-4d89-4ec7-843a-b8c189dbb005 DOI https://doi.org/10.1029/2023GL105811 ISSN 0094-8276 Source Geophysical Research Letters, 50 (23) Part of collection Institutional Repository Document type journal article Rights © 2023 Lindsey D. Anderson, Barbara Dix, Jordan Schnell, Robert Yokelson, j. Pepijn Veefkind, Ravan Ahmadov, Joost de Gouw Files PDF Geophysical_Research_Lett ... sition.pdf 3.83 MB Close viewer /islandora/object/uuid:863f7cb6-4d89-4ec7-843a-b8c189dbb005/datastream/OBJ/view