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A model assessment of polychlorinated dibenzo-p-dioxin and dibenzofuran sources and fate in the Baltic Sea:       
Umeå University, Faculty of Science and Technology, Chemistry.
2009 (English)In: Science of The Total Environment, Vol. 407, no 12, 3784-92 p.Article in journal (Refereed) Published
Abstract [en]

The contamination of the Baltic Sea with polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) has resulted in restrictions on the marketing and consumption of Baltic Sea fish, making this a priority environmental issue in the European Union. To date there is no consensus on the relative importance of different sources of PCDD/Fs to the Baltic Sea, and hence no consensus on how to address this issue. In this work we synthesized the available information to create a PCDD/F budget for the Baltic Sea, focusing on the two largest basins, the Bothnian Sea and the Baltic Proper. The non-steady state multimedia fate and transport model POPCYCLING-Baltic was employed, using recent data for PCDD/F concentrations in air and sediment as boundary conditions. The PCDD/F concentrations in water predicted by the model were in good agreement with recent measurements. The budget demonstrated that atmospheric deposition was the dominant source of PCDD/Fs to the basins as a whole. This conclusion was supported by a statistical comparison of the PCDD/F congener patterns in surface sediments from accumulation bottoms with the patterns in ambient air, bulk atmospheric deposition, and a range of potential industrial sources. Prospective model simulations indicated that the PCDD/F concentrations in the water column will continue to decrease in the coming years due to the slow response of the Baltic Sea system to falling PCDD/F inputs in the last decades, but that the decrease would be more pronounced if ambient air concentrations were to drop further in the future, for instance as a result of reduced emissions. The study illustrates the usefulness of using monitoring data and multimedia models in an integrated fashion to address complex organic contaminant issues.

Place, publisher, year, edition, pages
Elsevier B.V. , 2009. Vol. 407, no 12, 3784-92 p.
Keyword [en]
PCDD/Fs, Baltic Sea environment, Dynamic multimedia models
URN: urn:nbn:se:umu:diva-21191DOI: 10.1016/j.scitotenv.2009.03.001OAI: diva2:210938
Available from: 2009-04-07 Created: 2009-04-07 Last updated: 2010-02-09Bibliographically approved

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