Atmos. Chem. Phys., 18, 13481–13493, 2018 https://doi.org/10.5194/acp-18-13481-2018 © Author(s) 2018. This work is distributed under the Creative Commons Attribution 4.0 License. Observations of organic and inorganic chlorinated compounds and their contribution to chlorine radical concentrations in an urban environment in northern Europe during the wintertime Michael Priestley1, Michael le Breton1,a, Thomas J. Bannan1, Stephen D. Worrall1,b, Asan Bacak1, Andrew R. D. Smedley1,c, Ernesto Reyes-Villegas1, Archit Mehra1, James Allan1,2, Ann R. Webb1, Dudley E. Shallcross3, Hugh Coe1, and Carl J. Percival1,d 1Centre for Atmospheric Science, School of Earth and Environmental Sciences, University of Manchester, Manchester, M13 9PL, UK 2National Centre for Atmospheric Science, University of Manchester, Manchester, M13 9PL, UK 3School of Chemistry, The University of Bristol, Cantock’s Close BS8 1TS, UK anow at: Department of Chemistry and Molecular Biology, University of Gothenburg, 412 96 Gothenburg, Sweden bnow at: School of Materials, University of Manchester, Manchester, M13 9PL, UK cnow at: School of Mathematics, University of Manchester, Manchester, M13 9PL, UK dnow at: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, USA Correspondence: Carl Percival (
[email protected]) Received: 6 March 2018 – Discussion started: 7 March 2018 Revised: 27 July 2018 – Accepted: 28 August 2018 – Published: 21 September 2018 Abstract. A number of inorganic (nitryl chloride, ClNO2; tion and loss pathways are inhibited by reduced photolysis chlorine, Cl2; and hypochlorous acid, HOCl) and chlori- rates. This results in ClNO2 making up the dominant frac- nated, oxygenated volatile organic compounds (ClOVOCs) tion (83 %) on low radiant-flux days, as its concentrations have been measured in Manchester, UK during October are still high.