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The Baltic Sea contributes carbon dioxide to the atmosphere
Date:10/11/2011

The Baltic Sea emits more carbon dioxide than it can bind. Local variations have increased the exposure of the Bay of Bothnia. These are the results from a study of how carbon dioxide flows between the water of the Baltic Sea and the atmosphere, carried out by scientists at the University of Gothenburg, Sweden.

"The capacity of the Baltic Sea to absorb carbon dioxide without major changes to the acidity of the water has changed in recent centuries. In the Bay of Bothnia, the ability to resist change has fallen, while it has increased in the south-eastern parts of the Baltic Sea", says Karin Wesslander of the Department of Earth Sciences at the University of Gothenburg.

The concentration of carbon dioxide in the atmosphere is rising steadily as a result of human activities, but global climate models remain inaccurate. The coastal seas are rarely included in large-scale climate models. Karin Wesslander has investigated the carbon dioxide system of the surface water of the Baltic Sea, in order to increase understanding of how the concentration of carbon dioxide affects seas.

Carbon dioxide is an important component of photosynthesis, which converts the energy from sunlight, and it is phytoplankton that carry out photosynthesis in the seas. The carbon dioxide in the sea is consumed during the algal blooms that take place during the spring and summer.

This means that the fraction of carbon dioxide in the water is lower than it is in the atmosphere, and carbon dioxide flows into the sea. The sea is thus a sink for atmospheric carbon dioxide. When the plankton subsequently die, they are broken down and the carbon dioxide reappears in the water. The windy weather that occurs during the autumn and winter causes water mixing, and the carbon dioxide returns to the surface. This is the reason that the sea is most often a source of carbon dioxide during these seasons.

Large differences across the Baltic Sea

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Contact: Karin Wesslander
karinw@gvc.gu.se
46-317-862-873
University of Gothenburg
Source:Eurekalert  

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