Night‐time NO 3  and OH radical concentrations in the United Kingdom inferred from hydrocarbon measurements | Zendy

Khan M. A. H. | Zendy; Ashfold M. J. | Zendy; Nickless G. | Zendy; Martin D. | Zendy; Watson L. A. | Zendy; Hamer P. D. | Zendy; Wayne R. P. | Zendy; CanosaMas C. E. | Zendy; Shallcross D. E. | Zendy

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Night‐time NO 3 and OH radical concentrations in the United Kingdom inferred from hydrocarbon measurements

Author(s) -

Khan M. A. H.,

Ashfold M. J.,

Nickless G.,

Martin D.,

Watson L. A.,

Hamer P. D.,

Wayne R. P.,

CanosaMas C. E.,

Shallcross D. E.

Publication year - 2008

Publication title -

atmospheric science letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.951

H-Index - 45

ISSN - 1530-261X

DOI - 10.1002/asl.175

Subject(s) - hydrocarbon , spring (device) , atmospheric sciences , range (aeronautics) , chemistry , environmental science , molecule , environmental chemistry , meteorology , analytical chemistry (journal) , geology , materials science , physics , thermodynamics , organic chemistry , composite material

The hydrocarbon decay method (Rivett et al. , 2003) has been used to analyse hydrocarbon data from four contrasting sites in the United Kingdom to estimate night‐time levels of NO 3 and OH. Remarkably consistent results emerge using alkenes, revealing NO 3 and OH levels in the range of 0.01–10 ppt and 1 × 10 4 − 1 × 10 6 molecule cm −3 , respectively. Weak seasonal cycles are observed where NO 3 levels peak in spring and OH in summer. Analysis using alkanes suggests that Cl atom levels of around 2 × 10 4 molecule cm −3 may be present. How Cl may be formed at night in such high quantities is unknown and may not be the answer to the disparity between the two methods. Copyright © 2008 Royal Meteorological Society

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