Reactive organic carbon air emissions from mobile sources in the United States.

Autor:	Murphy BN; Center for Environmental Measurement and Modeling, U.S. Environmental Protection Agency, Research Triangle Park, NC 27711, United States., Sonntag D; Department of Civil and Construction Engineering, Brigham Young University, Provo, UT 84602, United States., Seltzer KM; Office of Air Quality Planning and Standards, U.S. Environmental Protection Agency, Research Triangle Park, NC 27711, United States., Pye HOT; Center for Environmental Measurement and Modeling, U.S. Environmental Protection Agency, Research Triangle Park, NC 27711, United States., Allen C; General Dynamics Information Technology, 79 T.W. Alexander Drive, Research Triangle Park, NC 27709, United States., Murray E; Office of Transportation and Air Quality, U.S. Environmental Protection Agency, Ann Arbor, MI 48105, United States., Toro C; Office of Transportation and Air Quality, U.S. Environmental Protection Agency, Ann Arbor, MI 48105, United States., Gentner DR; Department of Chemical and Environmental Engineering, Yale University, New Haven, CT 06511, United States., Huang C; State Environmental Protection Key Laboratory of Cause and Prevention of Urban Air Pollution Complex, Shanghai Academy of Environmental Sciences, Shanghai, 200233, China., Jathar S; Department of Mechanical Engineering, Colorado State University, Fort Collins, CO 80523, United States., Li L; Department of Chemical and Environmental Engineering, Yale University, New Haven, CT 06511, United States., May AA; Department of Civil, Environmental and Geodetic Engineering, The Ohio State University, Columbus, OH 43210, United States., Robinson AL; Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA15213, United States.
Jazyk:	angličtina
Zdroj:	Atmospheric chemistry and physics [Atmos Chem Phys] 2023 Oct 25; Vol. 23 (20), pp. 13469-13483.
DOI:	10.5194/acp-23-13469-2023
Abstrakt:	Mobile sources are responsible for a substantial controllable portion of the reactive organic carbon (ROC) emitted to the atmosphere, especially in urban environments of the United States. We update existing methods for calculating mobile source organic particle and vapor emissions in the United States with over a decade of laboratory data that parameterize the volatility and organic aerosol (OA) potential of emissions from on-road vehicles, nonroad engines, aircraft, marine vessels, and locomotives. We find that existing emission factor information from Teflon filters combined with quartz filters collapses into simple relationships and can be used to reconstruct the complete volatility distribution of ROC emissions. This new approach consists of source-specific filter artifact corrections and state-of-the-science speciation including explicit intermediate-volatility organic compounds (IVOCs), yielding the first bottom-up volatility-resolved inventory of US mobile source emissions. Using the Community Multiscale Air Quality model, we estimate mobile sources account for 20 %-25 % of the IVOC concentrations and 4.4 %-21.4 % of ambient OA. The updated emissions and air quality model reduce biases in predicting fine-particle organic carbon in winter, spring, and autumn throughout the United States (4.3 %-11.3 % reduction in normalized bias). We identify key uncertain parameters that align with current state-of-the-art research measurement challenges. Competing Interests: Competing interests. At least one of the (co-)authors is a member of the editorial board of Atmospheric Chemistry and Physics. The peer-review process was guided by an independent editor, and the authors also have no other competing interests to declare.
Databáze:	MEDLINE
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