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Geophys Res Lett

Title:		Anthropogenic control over wintertime oxidation of atmospheric pollutants
Author(s):		Haskins JD; Lopez-Hilfiker FD; Lee BH; Shah V; Wolfe GM; DiGangi J; Fibiger D; McDuffie EE; Veres P; Schroder JC; Campuzano-Jost P; Day DA; Jimenez JL; Weinheimer A; Sparks T; Cohen RC; Campos T; Sullivan A; Guo H; Weber R; Dibb J; Greene J; Fiddler M; Bililign S; Jaegle L; Brown SS; Thornton JA;
Address:		"Department of Atmospheric Sciences, University of Washington, Seattle, WA USA. Joint Center for Earth Systems Technology, University of Maryland Baltimore County, Baltimore, MD USA. Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD USA. NASA Langley Research Center, Hampton, VA USA. Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA. Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO USA. Department of Chemistry, University of Colorado, Boulder, CO USA. Earth Observing Laboratory, National Center for Atmospheric Research, Boulder, CO USA. Department of Chemistry, University of California, Berkeley CA USA. Department of Atmospheric Sciences, Colorado State University, Fort Collins, CO USA. School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA USA. Department of Earth Sciences, University of New Hampshire, Durham, NH USA. Department of Physics, North Carolina A&T State University, Greensboro, NC USA"
Journal Title:		Geophys Res Lett
Year:		2019
Volume:		20191213
Issue:		24
Page Number:		14826 - 14835
DOI:		10.1029/2019GL085498
ISSN/ISBN:		0094-8276 (Print) 1944-8007 (Electronic) 0094-8276 (Linking)
Abstract:		"During winter in the mid-latitudes, photochemical oxidation is significantly slower than in summer and the main radical oxidants driving formation of secondary pollutants, such as fine particulate matter and ozone, remain uncertain, owing to a lack of observations in this season. Using airborne observations, we quantify the contribution of various oxidants on a regional basis during winter, enabling improved chemical descriptions of wintertime air pollution transformations. We show that 25-60% of NO(x) is converted to N(2)O(5) via multiphase reactions between gas-phase nitrogen oxide reservoirs and aerosol particles, with ~93% reacting in the marine boundary layer to form >2.5 ppbv ClNO(2). This results in >70% of the oxidizing capacity of polluted air during winter being controlled, not by typical photochemical reactions, but from these multiphase reactions and emissions of volatile organic compounds, such as HCHO, highlighting the control local anthropogenic emissions have on the oxidizing capacity of the polluted wintertime atmosphere"
Keywords:
Notes:		"PubMed-not-MEDLINEHaskins, J D Lopez-Hilfiker, F D Lee, B H Shah, V Wolfe, G M DiGangi, J Fibiger, D McDuffie, E E Veres, P Schroder, J C Campuzano-Jost, P Day, D A Jimenez, J L Weinheimer, A Sparks, T Cohen, R C Campos, T Sullivan, A Guo, H Weber, R Dibb, J Greene, J Fiddler, M Bililign, S Jaegle, L Brown, S S Thornton, J A eng SCMD-EarthScienceSystem/Science Earth Science System NASA/ 2020/10/06 Geophys Res Lett. 2019 Dec 28; 46(24):14826-14835. doi: 10.1029/2019GL085498. Epub 2019 Dec 13"