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A large source of atomic chlorine from ClNO2 photolysis at a UK landfill site

Research output: Contribution to journalArticle

  • Thomas Bannan
  • Anwar Khan
  • Michael Le Breton
  • Michael Priestley
  • Stephen Worrall
  • Asan Bacak
  • Nicholas Marsden
  • Douglas Lowe
  • Joe Pitt
  • Grant Allen
  • David Topping
  • Hugh Coe
  • Gordon McFiggans
  • Dudley Shallcross
  • Carl Percival
Original languageEnglish
Pages (from-to)8508-8516
Number of pages9
JournalGeophysical Research Letters
Volume46
DOIs
DateAccepted/In press - 15 Jul 2019
DatePublished (current) - 29 Jul 2019

Abstract

Nitryl Chloride (ClNO2) acts as a source of highly reactive chlorine atoms as well as an important NOx reservoir. Measurements of ClNO2 at an operational UK landfill site are reported here for the first time. A peak concentration of 4 ppb of ClNO2 was found with a peak mean night time maximum of 0.9 ppb. Using models based upon the photolysis of observed ClNO2 and atmospheric chlorine chemistry, chlorine atom concentrations reaching in excess of 1.20 x 105 molecules cm-3 in the early morning following sunrise are calculated. These concentrations are approximately 10 times higher than previously reported in the UK, suggesting a significant impact on the oxidising capacity around such sites. Given the ubiquity of landfill sites regionally and globally, and the large abundances of Cl atoms from the photolysis of ClNO2, chlorine chemistry has a significant impact on ozone formation and VOCs oxidation as shown by WRF-Chem modelling.

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    Rights statement: This is the final published version of the article (version of record). It first appeared online via American Geophysical Union at https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019GL083764 . Please refer to any applicable terms of use of the publisher.

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