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Title: Night-time chemistry above London: measurements of NO[subscript 3] and N[subscript 2]O[subscript 5] from the BT Tower
Authors: Benton, A.K.
Langridge, J.M.
Ball, S.M.
Bloss, W.J.
Dall'Osto, M.
Nemitz, E.
Harrison, R.M.
Jones, R.L.
First Published: 2010
Publisher: Copernicus GmbH (Copernicus Publications) on behalf of the European Geosciences Union (EGU).
Citation: Atmospheric Chemistry and Physics, 2010, 10 (20), pp. 9781-9795
Abstract: Broadband cavity enhanced absorption spectroscopy (BBCEAS) has been used to measure the sum of concentrations of NO[subscript 3] and N[subscript 2]O[subscript 5] from the BT (telecommunications) Tower 160 m above street level in central London during the REPARTEE II campaign in October and November 2007. Substantial variability was observed in these night-time nitrogen compounds: peak NO[subscript 3] and N[subscript 2]O[subscript 5] mixing ratios reached 800 pptv, whereas the mean night-time NO[subscript 3] and N[subscript 2]O[subscript 5] was approximately 30 pptv. Additionally, [NO[subscript 3] and N[subscript 2]O[subscript 5]] showed negative correlations with [NO] and [NO[subscript 2]] and a positive correlation with [O[subscript 3]]. Co-measurements of temperature and NO[subscript 2] from the BT Tower were used to calculate the equilibrium partitioning between NO[subscript 3] and N[subscript 2]O[subscript 5] which was always found to strongly favour N[subscript 2]O[subscript 5] (NO[subscript 3]/N[subscript 2]O[subscript 5]=0.01 to 0.04). Two methods are used to calculate the lifetimes for NO[subscript 3] and N[subscript 2]O[subscript 5], the results being compared and discussed in terms of the implications for the night-time oxidation of nitrogen oxides and the night-time sinks for NO[subscript y].
DOI Link: 10.5194/acp-10-9781-2010
ISSN: 1680-7316
eISSN: 1680-7324
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: © Author(s) 2010. This is an open-access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Appears in Collections:Published Articles, Dept. of Chemistry

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