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Abstract. Bromoform mixing ratios in marine air were measured at Cape Point GlobalAtmospheric Watch Station, South Africa. This represents the first suchbromoform data set recorded at this location. Manual daily measurements weremade during a month-long field campaign (austral spring 2011) using a gaschromatograph-electron capture detector (GC-ECD) with a custom-built frontend thermal desorption trap. The measured concentrations ranged between 4.4and 64.6 ( ±  22.2 %)  ppt with a mean of24.8  ±  14.8  ppt . The highest mixing ratios recorded hereoccurred at, or shortly after, low tide. The diurnal cycle exhibited amorning and evening maximum with lower concentrations throughout the rest ofthe day. Initial analysis of the data presented indicates that the local kelpbeds were the dominant source of the bromoform reported. A concentration-weighted trajectory analysis of the bromoform measurements suggests that twooffshore source areas may exist. These source areas appear to be centred onthe Agulhas retroflection and extend from St Helena Bay to the southwest.

Atmospheric bromoform at Cape Point, South Africa: an initial fixed-point data set on the African continent