An Experiment with Forced Oxygenation of the Deepwater of the Anoxic By Fjord, Western Sweden

Anders Stigebrandt, Bengt Liljebladh, Loreto De Brabandere, Michael Forth, Ake Granmo, P. Hall, Jonatan Hammar, Daniel Hansson, Mikhail Kononets, Marina Magnusson, Fredrik Noren, Lars Rahm, Alexander Treusch, Lena Viktorsson

Research output: Contribution to journalArticle

Abstract

In a 2.5-year-long environmental engineering experiment in the By Fjord, surface water was pumped into the deepwater where the frequency of deepwater renewals increased by a factor of 10. During the experiment, the deepwater became long-term oxic, and nitrate became the dominating dissolved inorganic nitrogen component. The amount of phosphate in the water column decreased by a factor of 5 due to the increase in flushing and reduction in the leakage of phosphate from the sediments when the sediment surface became oxidized. Oxygenation of the sediments did not increase the leakage of toxic metals and organic pollutants. The bacterial community was the first to show changes after the oxygenation, with aerobic bacteria also thriving in the deepwater. The earlier azoic deepwater bottom sediments were colonized by animals. No structural difference between the phytoplankton communities in the By Fjord and the adjacent Havsten Fjord, with oxygenated deepwater, could be detected during the experiment.
Original languageEnglish
Pages (from-to)42-54
Number of pages13
JournalAmbio
Volume44
Issue number1
DOIs
Publication statusPublished - 2015

Keywords

  • Deepwater oxygenation
  • Environmental engineering
  • anoxia
  • ecological effects
  • sediment colonization
  • phosphorus

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