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Atmospheric concentrations of the volatile reactive iodocarbonsC2H5I, 1-C3H7I, 2-C3H7I, CH2ICl,CH2IBr, CH2I2 and bromocarbons CH2Br2 andCHBr3 were determined by GC/MS analysis of marine boundary layer air atRoscoff, Brittany on the northwest coast of France during September 2006.Comparison with other coastal studies suggests that emissions of these tracegases are strongly influenced by site topography, seaweed populations anddistribution, as well as wind speed and direction and tide height.Concentrations of the very short-lived dihalomethanes CH2IBr andCH2I2 in particular showed evidence of tidal dependence, withhigher concentrations observed at low tide during maximum exposure ofseaweed beds. We also present a limited number of halocarbon measurements insurface seawater and estimate sea-air fluxes based on these and simultaneousair measurements. CH2Br2 and CHBr3 were strongly correlatedboth in air and in seawater, with CH2Br2/CHBr3 ratios of 0.19in air and 0.06 in water. The combined midday I atom flux from thephotolabile diahlomethanes CH2I2, CH2IBr and CH2ICl of~5×103 molecules cm−3 s−1 is several orders ofmagnitude lower than the estimated I atom flux from I2 based oncoinciding measurements at the same site, which indicates that at Roscoffthe major I atom precursor was I2 rather than reactive iodocarbons

Coastal measurements of short-lived reactive iodocarbons and bromocarbons at Roscoff, Brittany during the RHaMBLe campaign