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Oxygenation at a depth of 120 meters can save the Baltic Sea
Date:4/18/2011

Oxygenation brings dead sea bottoms to life. This creates the necessary conditions for the establishment of new ecosystems that enable nature itself to deal with eutrophication. By conducting pilot studies in two fjords in Sweden, researchers at the University of Gothenburg have demonstrated that pumping oxygen-rich surface water down to sea bottoms is effective. A large wind-driven pump is now to be tested in open water in the Baltic.

"Today everyone is focused on reducing nutrient inputs to the sea in order to reduce eutrophication in the Baltic, but by helping nature itself to deal with the phosphorus that is discharged we can create a turbo effect in the battle against eutrophication," says Anders Stigebrandt, Professor Emeritus at the Department of Earth Sciences, University of Gothenburg.

The idea of oxygenating dead sea bottoms comes from nature itself. The method of oxygenating the deep water in the Baltic can be compared to creating wetlands on land. Both methods are based on creating the conditions required for ecosystem services by establishing new ecosystems that can effectively bind the nutrients.

"If oxygen-free bottoms in the Baltic are oxygenated, it can be anticipated that every square kilometre of bottom surface will be able to bind 3 tonnes of phosphorus in a short time, which is a purely geochemical effect. If the bottoms are then kept oxygenated for a prolonged period, fauna becomes established on and in the bottoms. This leads to the bottom sediments being oxygenated down to a depth of several centimetres, and the new ecosystem probably contributes to the possibility of further phosphorus being bound to the sediment."

The research project Baltic Deepwater Oxygenation, directed by Stigebrandt, is testing the hypothesis that prolonged oxygenation of the Baltic deep water results in long-term and increasing binding of phosphorus in bottom sediment. An important question to be answered is how the oxygenated
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Contact: Anders Stigebrandt
anst@gvc.gu.se
46-031-786-2851
University of Gothenburg
Source:Eurekalert

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