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An experiment with forced oxygenation of the deepwater of the anoxic By Fjord, western Sweden

Journal article
Authors Anders Stigebrandt
Bengt Liljebladh
L. De Brabandere
M Forth
Åke Granmo
Per Hall
J Hammar
Daniel Hansson
Mikhail Y Kononets
M Magnusson
F Norén
L Rahm
A Treusch
Lena Viktorsson
Published in Ambio
Volume 44
Issue 1
Pages 42-54
ISSN 0044-7447
Publication year 2015
Published at Department of Earth Sciences
Department of marine sciences
Department of Chemistry and Molecular Biology
Swedish Institute for the Marine Environment
Pages 42-54
Language en
Links dx.doi.org/10.1007/s13280-014-0524-...
Keywords syresättning av fjordbassäng, ekologisk ingenjörskonst, syrefritt, återkolonisering av tidigare dör bassäng
Subject categories Earth and Related Environmental Sciences

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.

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