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The aim of the work presented here was to detect BrO in themarine boundary layer over the Eastern North-Atlantic by MultiAXis-Differential Optical Absorption Spectroscopy (MAX-DOAS)of scattered sunlight. With this technique, information about theconcentration and the vertical profile of trace gases in theatmosphere can be gained. BrO can be formed in the marineatmosphere by degradation of biogenic organohalogens or by oxidationof bromide in sea salt aerosol. BrO influences the chemistry inmarine air in many ways, e.g. since it catalytically destroys ozone,changes the NO<sub>2</sub>/NO-ratio as well as theOH/HO<sub>2</sub>-ratio and oxidises DMS. However, the abundanceand the significance of BrO in the marine atmosphere is notyet fully understood.  We report on data collected during a ship cruise, which took placealong the West African Coast in February 2007, within the framework ofthe Surface Ocean PRocesses in the ANthropocene project(SOPRAN). Tropospheric BrO could be detected during this cruiseat peak mixing ratios of (10.2±3.7) ppt at an assumedlayer height of 1 km on 18 February 2007. Furthermore, it wasfound that the mean BrO concentrations increased when cruisingclose to the African Coast suggesting that at least part of theBrO might have originated from there

BrO measurements over the Eastern North-Atlantic