Depth profiles of chlorofluoromethanes in the Norwegian sea |
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| Authors: | A Hahne A Volz D H Ehhalt H Cosatto W Roether W Weiss B Kromer |
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| Institution: | (1) Institut für Chemie 3, Kernforschungsanlage Jülich GmbH, D-5170 Jülich, Fed. Rep. of Germany;(2) Institut für Umweltphysik, Universität Heidelberg, Im Neuenheimer Feld 366, D-6900 Heidelberg, Fed. Rep. of Germany |
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| Abstract: | Depth profiles of the chlorofluoromethanes (CFM), CFCl3 and CF2Cl2, have been obtained together with tritium profiles from water samples collected in the Norwegian Sea between surface and 2800 m depth. CFM analysis was performed by vacuum extraction of the dissolved gases from 500 ml samples of seawater and subsequent gaschromatographic measurement. The CFM concentration decreases with depth to about 10 percent of surface concentration at depths below 2000 m. The same behaviour is found for the tritium content. From a correlation of the CFM and tritium concentration the upper limit of the preindustrial atmospheric CFM levels can be estimated to  5 percent of the present day concentrations. |
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| Keywords: | Chlorofluoromethanes Stratospheric chlorine Oceanographic tracers |
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