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Summer distribution of dissolved Al, Cd, Co, Cu, Mn and Ni in surface waters around the British Isles
In: Continental Shelf Research. Pergamon Press: Oxford; New York. ISSN 0278-4343; e-ISSN 1873-6955, meer
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| Abstract |
In July 1984, 64 surface samples (6 m depth) were collected on a cruise from Hamburg to Le Harve via the north of Scotland and the Irish Sea. In general, the levels of metals detected for Al, Cd, Co, Cu, Mn and Ni agree with more localized observations in this shelf sea area. Clear differences were observed between the different water types. Highest levels were in the low salinity (<33 × 10−3) water of the German Bight and French Coast. Lowest levels were in the high salinity pristine North Atlantic surface water off northwest Scotland. Elevated levels of all metals were observed in the Irish Sea, with average concentrations for Al, Cd, Co, Cu, Mn and Ni (in nmol kg−1) of 10.6, 0.22, 0.14, 6.7, 10.1 and 5.2, respectively. The good correlation of metal concentrations with those of Mn suggests a sedimentary source in all regions investigated which is also supported by the radium-226 levels observed in the major water types. Anomalous peaks in Al in the Irish Sea which correspond to hydrographic features suggest a specific source of Al which is not significant for the other metals. This may be aeolian dust. Winter data for Al in the English Channel shows Al concentrations to be 3 times higher than observed on this cruise. A winter season cruise along the same track is required to assess the impact of biological removal throughout the area on dissolved metal concentrations. |
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