Abstract
Geografisk Tidsskrift—Danish Journal of Geography 109(1):81–94, 2009 A total of 63 sediment samples were collected in the North Sea—Baltic Sea transition zone using hydraulically damped box-corer. Analysis of the top one cm sediments shows a north to south trend in Li, Ca and methylated PAHs suggesting transport of these elements and micro pollutants from the North Sea to the Baltic Sea. The sediment content of a high C/N ratio reflects preferential N decomposition during transport whereas a low P content in the northern and deepest part of the study area may result from early diagenesis effects. The spatial distributions of Zn and Pb with highest concentrations in the southern part of the study area imply local terrestrial supply and transport. In general, the PCB and PAH concentrations were high both in the northern and the southern parts of the area and low in-between. The relative constant ratio between the analyzed PCBs on all the stations suggests atmospheric deposition as the main source of PCB. Fluoranthene/Pyrene ratios >1 and Phenenthrene/Anthracene ratios <15 point at combustion of fossilfuel as the main source of PAH.
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