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Summary: Statistical inference of OH concentrations and air mass
dilution rates from successive observations of nonmethane
hydrocarbons in single air masses
S. R. Arnold,1
J. Methven,2
M. J. Evans,1
M. P. Chipperfield,1
A. C. Lewis,3
J. R. Hopkins,3
J. B. McQuaid,1
N. Watson,3
R. M. Purvis,3,4
J. D. Lee,3
E. L. Atlas,5
D. R. Blake,6
and B. Rappenglu¨ck7
Received 31 May 2006; revised 20 December 2006; accepted 10 January 2007; published 3 May 2007.
[1] Bayesian inference has been used to determine rigorous estimates of hydroxyl radical
concentrations ( OH˝ ) and air mass dilution rates (K) averaged following air masses
between linked observations of nonmethane hydrocarbons (NMHCs) spanning the
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