Night-time chemistry above London: measurements of NO3 and N2O5 from the BT Tower during REPARTEE-II

Benton, A.K.; Langridge, R.M.; Ball, S.M.; Bloss, W.J.; Dall'Osto, M.; Nemitz, E.; Harrison, R.M.; Jones, R.L.. 2010 Night-time chemistry above London: measurements of NO3 and N2O5 from the BT Tower during REPARTEE-II. Atmospheric Chemistry and Physics, 10. 9781-9795. 10.5194/acp-10-9781-2010

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Broadband cavity enhanced absorption spectroscopy (BBCEAS) has been used to measure the sum of concentrations of NO3 and N2O5 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 NO3+N2O5 mixing ratios reached 800 pptv, whereas the mean night-time NO3+N2O5 was approximately 30 pptv. Additionally, [NO3+N2O5] showed negative correlations with [NO] and [NO2] and a positive correlation with [O3]. Co-measurements of temperature and NO2 from the BT Tower were used to calculate the equilibrium partitioning between NO3 and N2O5 which was always found to strongly favour N2O5 (NO3/N2O5=0.01 to 0.04). Two methods are used to calculate the lifetimes for NO3 and N2O5, 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 NOy.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.5194/acp-10-9781-2010
Programmes: CEH Topics & Objectives 2009 - 2012 > Biogeochemistry > BGC Topic 1 - Monitoring and Interpretation of Biogeochemical and Climate Changes > BGC - 1.1 - Monitor concentrations, fluxes, physico-chemical forms of current and emerging pollutants ...
CEH Sections: Billett (to November 2013)
ISSN: 1680-7316
Additional Information. Not used in RCUK Gateway to Research.: Atmospheric Chemistry and Physics is an Open Access Journal - access full text of this article via the OFFICIAL URL link
NORA Subject Terms: Atmospheric Sciences
Date made live: 16 Dec 2010 11:54

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