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| Titel |
Night-time measurements of HOx during the RONOCO project and analysis of the sources of HO2 |
| VerfasserIn |
H. M. Walker, D. Stone, T. Ingham, S. Vaughan, M. Cain, R. L. Jones, O. J. Kennedy, M. McLeod, B. Ouyang, J. Pyle, S. Bauguitte, B. Bandy, G. Förster, M. J. Evans, J. F. Hamilton, J. R. Hopkins, J. D. Lee, A. C. Lewis, R. T. Lidster, S. Punjabi, W. T. Morgan, D. E. Heard |
| 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 ; 15, no. 14 ; Nr. 15, no. 14 (2015-07-23), S.8179-8200 |
| Datensatznummer |
250119925
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| Publikation (Nr.) |
 copernicus.org/acp-15-8179-2015.pdf |
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| Zusammenfassung |
| Measurements of the radical species OH and HO2 were
made using the fluorescence assay by gas expansion (FAGE) technique during a
series of night-time and daytime flights over the UK in summer 2010 and
winter 2011. OH was not detected above the instrument's 1σ limit of
detection during any of the night-time flights or during the winter daytime
flights, placing upper limits on [OH] of
1.8 × 106 molecule cm−3 and
6.4 × 105 molecule cm−3 for the summer and winter
flights, respectively. HO2 reached a maximum concentration of
3.2 × 108 molecule cm−3 (13.6 pptv) during a night-time
flight on 20 July 2010, when the highest concentrations of NO3 and
O3 were also recorded. An analysis of the rates of reaction of OH,
O3, and the NO3 radical with measured alkenes indicates that the
summer night-time troposphere can be as important for the processing of
volatile organic compounds (VOCs) as the winter daytime troposphere. An
analysis of the instantaneous rate of production of HO2 from the
reactions of O3 and NO3 with alkenes has shown that, on average,
reactions of NO3 dominated the night-time production of HO2 during
summer and reactions of O3 dominated the night-time HO2 production
during winter. |
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