Alkyl nitrate photochemistry during the tropospheric organic chemistry experiment

Worton, David R., Reeves, Claire E. ORCID:, Penkett, Stuart A., Sturges, William T. ORCID:, Slemr, Jana, Oram, Daivd E., Bandy, Brian J., Bloss, William J., Carslaw, Nicola, Davey, James, Emmerson, Kathryn M., Gravestock, Thomas J., Hamilton, Jacqueline F., Heard, Dwayne E., Hopkins, James R., Hulse, Anne, Ingram, Trevor, Jacob, Mark J., Lee, James D., Leigh, Roland J., Lewis, Alastair C., Monks, Paul S. and Smith, Shona C. (2010) Alkyl nitrate photochemistry during the tropospheric organic chemistry experiment. Atmospheric Environment, 44 (6). pp. 773-785.

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Alkyl nitrates (C1-C5) were measured at two sites (near urban and rural) in southeast England during the Tropospheric Organic Chemistry Experiment (TORCH). Methyl nitrate was the dominant species during both campaigns accounting for on average about one third of the total measured alkyl nitrates. High mixing ratios (>50 pptv) and variability of methyl nitrate were observed at the near urban site (TORCH1) that were not seen at the rural site (TORCH2) and which could not be explained by local photochemical production or direct emissions. The diurnal variation of methyl nitrate during TORCH1 showed a morning maximum that would be consistent with nighttime chemistry followed by transport to the surface by boundary layer dynamics. Similarly, elevated morning mixing ratios were also observed during TORCH2 although the magnitudes were much smaller. As a result, methyl nitrate could represent a tracer for nighttime chemistry seen at the ground the following day. At both campaigns, the dominant source of short chain alkyl nitrates and carbonyl precursor radicals (=C4) were from decomposition of larger compounds. The magnitude of the source increased with decreasing carbon number consistent with increasing total precursor abundance. Non-photochemical emissions of acetaldehyde and acetone could not be accounted for by automobile exhaust emissions alone and indicated that other direct sources are likely important in this environment.

Item Type: Article
Faculty \ School: Faculty of Science > School of Environmental Sciences
University of East Anglia Research Groups/Centres > Theme - ClimateUEA
UEA Research Groups: Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences
Faculty of Science > Research Groups > Marine and Atmospheric Sciences (former - to 2017)
Faculty of Science > Research Groups > Atmospheric Chemistry (former - to 2018)
Faculty of Science > Research Groups > Climate, Ocean and Atmospheric Sciences (former - to 2017)
Depositing User: Rosie Cullington
Date Deposited: 17 Feb 2011 11:42
Last Modified: 20 Mar 2023 09:32
DOI: 10.1016/j.atmosenv.2009.11.038

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