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Biogeosciences An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/bg-2020-151
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2020-151
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  19 May 2020

19 May 2020

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This preprint is currently under review for the journal BG.

Cyanobacteria Blooms in the Baltic Sea: A Review of Models and Facts

Britta Munkes1, Ulrike Löptien1,2, and Heiner Dietze1,2 Britta Munkes et al.
  • 1GEOMAR, Helmholtz Centre for Ocean Research Kiel, Düsternbrooker Weg 20, D-24105 Kiel, Germany
  • 2Institute of Geosciences, Christian-Albrechts-University of Kiel, Ludewig-Meyn-Str. 10, 24 118 Kiel, Germany

Abstract. The ecosystem of the Baltic Sea is endangered by eutrophication. This has triggered expensive international management efforts. Some of these efforts are impeded by natural processes such as nitrogen-fixing cyanobacteria blooms that add bioavailable nitrogen to the already over-fertilised system and thereby enhance primary production, export of organic matter to depth and associated oxygen consumption. Controls of cyanobacteria blooms are not comprehensively understood and this adds to the uncertainty 5 of model-based projections into the warming future of the Baltic Sea. Here we review our current understanding of cyanobacteria bloom dynamics. We summarise published field studies, laboratory experiments and dissect the basic principles ingrained in state-of-the-art coupled ocean-circulation biogeochemical models.

Britta Munkes et al.

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Britta Munkes et al.

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Latest update: 27 Sep 2020
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Short summary
Cyanobacteria blooms can strongly aggravate eutrophication problems of water bodies. Their controls are, however, not comprehensively understood which impedes effective management and protection plans. Here we review the current understanding of cyanobacteria blooms. Juxtapositioning respective field and laboratory studies with state-of-the-art mathematical models reveal substantial uncertainty associated to nutrient demands, grazing and death of cyanobacteria.
Cyanobacteria blooms can strongly aggravate eutrophication problems of water bodies. Their...
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