Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 7 16 2007 10.5194/acp-7-4171-2007 http://www.atmos-chem-phys.net/7/4171/2007/ http://www.atmos-chem-phys.net/7/4171/2007/acp-7-4171-2007.html http://www.atmos-chem-phys.net/7/4171/2007/acp-7-4171-2007.pdf 4171 4185 2007-08-16 Observations of OH and HO₂ radicals in coastal Antarctica W. J. Bloss w.j.bloss@bham.ac.uk J. D. Lee D. E. Heard R. A. Salmon S. J.-B. Bauguitte H. K. Roscoe A. E. Jones School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK British Antarctic Survey, Madingley Road, Cambridge, CB3 0ET, UK now at: School of Geography, Earth & Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK now at: Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK OH and HO₂ radical concentrations have been measured in the boundary layer of coastal Antarctica for a six-week period during the austral summer of 2005. The measurements were performed at the British Antarctic Survey's Halley Research Station (75° 35' S, 26° 19' W), using the technique of on-resonance laser-induced fluorescence to detect OH, with HO₂ measured following chemical conversion through addition of NO. The mean radical levels were 3.9×10⁵ molecule cm^−3 for OH, and 0.76 ppt for HO₂ (ppt denotes parts per trillion, by volume). Typical maximum (local noontime) levels were 7.9×10⁵ molecule cm^−3 and 1.50 ppt for OH and HO₂ respectively. The main sources of HO_x were photolysis of O₃ and HCHO, with potentially important but uncertain contributions from HONO and higher aldehydes. Of the measured OH sinks, reaction with CO and CH₄ dominated, however comparison of the observed OH concentrations with those calculated via the steady state approximation indicated that additional co-reactants were likely to have been present. 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