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

deep-water areas can bind phosphorus in the longer term. The answers are being sought through pilot studies in Byfjorden on the west coast and Kanholmsfjrden on the east coast, as well as in laboratory experiments. The project includes examining how the oxygenated bottoms are colonised and how this affects phosphorus uptake.

Stigebrandt is now planning a trial involving large-scale wind-driven pumping in the open water of the Baltic, in cooperation with Inocean AB, which is designing the pump on the basis of established technology from the off-shore industry. The pump is contained in a 60 metres high and 100 metres deep tubular buoy which is anchored in an open location, in a deep basin yet to be decided off the east coast of Sweden. As a result of the buoy being given a small cross-sectional area at the water surface, the pump becomes non-sensitive to wave motions.

"The pump is to have capacity to pump 30 cubic metres of water per second, which is 15 times more than the pump in the Byfjord experiment. If this works, using a five times larger pump in a buoy around 120 metres deep should not pose major problems. This is the size we anticipate pumps needing to have in a future large-scale system for oxygenation of the Baltic deep water," says Stigebrandt.


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Contact: Anders Stigebrandt
anst@gvc.gu.se
46-031-786-2851
University of Gothenburg
Source:Eurekalert

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