Atmospheric Measurement Techniques Discussions www.atmos-meas-tech-discuss.net 1867-8610 2 2 2009 10.5194/amtd-2-621-2009 http://www.atmos-meas-tech-discuss.net/2/621/2009/ http://www.atmos-meas-tech-discuss.net/2/621/2009/amtd-2-621-2009.html http://www.atmos-meas-tech-discuss.net/2/621/2009/amtd-2-621-2009.pdf 621 657 2009-03-02 A flow-tube based laser-induced fluorescence instrument to measure OH reactivity in the troposphere T. Ingham A. Goddard L. K. Whalley K. L. Furneaux P. M. Edwards C. P. Seal D. E. Self G. P. Johnson K. A. Read J. D. Lee D. E. Heard School of Chemistry, University of Leeds, Leeds, LS2 9JT, UK Department of Chemistry, University of York, York, YO10 5DD, UK National Centre for Atmospheric Science (NCAS), University of Leeds, Leeds, LS2 9JT, UK National Centre for Atmospheric Science (NCAS), University of York, York, YO10 5DD, UK A field instrument utilising the artificial generation of OH radicals in a sliding injector flow-tube reactor with detection by laser-induced fluorescence spectroscopy has been developed to measure the rate of decay of OH by reaction with its atmospheric sinks. The OH reactivity instrument has been calibrated using known concentrations of CO, NO₂ and single hydrocarbons in a flow of zero air, and the impact of recycling of OH via the reaction HO₂+NO→OH+NO₂ on the measured OH reactivity has been quantified. 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