Anthropogenic control over wintertime oxidation of atmospheric pollutants

Anthropogenic control over wintertime oxidation of atmospheric pollutants

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 obse...

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Veröffentlicht in:Geophysical research letters. - 1984. - 46(2019), 24 vom: 28. Dez., Seite 14826-14835
1. Verfasser: Haskins, J D (VerfasserIn)
Weitere Verfasser: 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, Jaeglé, L, Brown, S S, Thornton, J A
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2019
Zugriff auf das übergeordnete Werk:Geophysical research letters
Schlagworte:Journal Article
Beschreibung
Zusammenfassung: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 NOx is converted to N2O5 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 ClNO2. 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
Beschreibung:Date Revised 10.01.2021
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:0094-8276
DOI:10.1029/2019GL085498