Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 4 2009 10.5194/acpd-9-17125-2009 http://www.atmos-chem-phys-discuss.net/9/17125/2009/ http://www.atmos-chem-phys-discuss.net/9/17125/2009/acpd-9-17125-2009.html http://www.atmos-chem-phys-discuss.net/9/17125/2009/acpd-9-17125-2009.pdf 17125 17155 2009-08-14 Coastal measurements of short-lived reactive iodocarbons and bromocarbons at Roscoff, Brittany during the RHaMBLe campaign C. E. Jones cej103@york.ac.uk K. E. Hornsby R. M. Dunk R. J. Leigh L. J. Carpenter Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK Department of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UK now at: Crichton Carbon Centre, Crichton University Campus, Dumfries, DG1 4ZL, UK Atmospheric concentrations of the volatile reactive iodocarbons C₂H₅I, 1-C₃H₇I, 2-C₃H₇I, CH₂ICl, CH₂IBr, CH₂I₂ and bromocarbons CH₂Br₂ and CHBr₃ were determined by GC/MS analysis of marine boundary layer air at Roscoff, Brittany on the northwest coast of France during September 2006. Comparison with other coastal studies suggests that emissions of these trace gases are strongly influenced by site topography, seaweed populations and distribution, as well as tide height. Concentrations of the very short-lived dihalomethanes CH₂IBr and CH₂I₂ in particular showed evidence of tidal dependence, with higher concentrations observed at low tide during maximum exposure of seaweed beds. 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