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  • Seawater samples were collected from 15m at the Rothera time series (RaTS) site from February 2005 until March 2007. During summer 2005-2006 samples were analysed using a GC-MS (gas chromatograph mass selective detector) set up in the Bonner laboratory. At all other times samples were stored on solid sorbents at -20C and returned to UEA for analysis. All trace gas seawater samples were extracted by purging and the resulting samples were analysed for selected alkyl nitrates and organohalogens using a GC-MSD. The instrument was set-up in the Bonner Laboratory at Rothera between November 2005 and April 2006. Sampling was not possible between mid-October and late December 2005 as the sea-ice remaining in the bay was not safe enough to traverse but was too abundant to launch a boat.

  • The 2005-2006 field campaign was to determine alkyl nitrate and organo-halogen concentrations in the upper 100m of the water column at the Rothera Time Series (RaTS) site. Water samples were collected using a Niskin bottle hand winched to depths of 0, 5, 10, 15, 25, 50 and 100m. In total 12 depth profiles were obtained between 4 January and 4 March 2006. All trace gas seawater samples were extracted by purging and the resulting samples were analysed for selected alkyl nitrates and organohalogens using a gas chromatograph - mass selective detector (GC-MSD). The instrument was set up in the Bonner Laboratory at Rothera between November 2005 and April 2006. Sampling was not possible between mid-October and late December 2005 as the sea-ice remaining in the bay was not safe enough to traverse but was too abundant to launch a boat.