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| Titel |
Night-time chemistry above London: measurements of NO3 and N2O5 from the BT Tower |
| VerfasserIn |
A. K. Benton, J. M. Langridge, S. M. Ball, W. J. Bloss, M. Dall'Osto, E. Nemitz, R. M. Harrison, R. L. Jones |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 20 ; Nr. 10, no. 20 (2010-10-19), S.9781-9795 |
| Datensatznummer |
250008834
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| Publikation (Nr.) |
 copernicus.org/acp-10-9781-2010.pdf |
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| Zusammenfassung |
| 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. |
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