Factors controlling phosphorus release from sediments in coastal archipelago areas

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Irma Puttonen, Tuula Kohonen, Johanna Mattila
Publisher: Elsevier
Publication year: 2016
Journal: Marine Pollution Bulletin
Volume number: 108
Issue number: 1-2
Start page: 77
End page: 86
eISSN: 1879-3363


Abstract

In coastal archipelago areas of the northern Baltic Sea, significantly higher phosphate concentrations (6.0 ±
4.5 μmol/l, mean ± SD) were measured in water samples close to the sediment surface compared with those
from 1 m above the seafloor (1.6± 2.0 μmol/l). The results indicated notable phosphate release from sediments
under the bottom water oxygen concentrations of up to 250 μmol/l, especially in areas that had experienced recent
temporal fluctuation between oxic and hypoxic/anoxic conditions. No single factor alone was found to control
the elevated PO4-P concentrations in the near-bottom water. In addition to the oxygen in the water, the
contents of potentially mobile phosphorus fractions, grain-size, the organic content at the sediment surface,
and the water depth were all important factors controlling the internal loading of phosphorus. The complexity
of this process needs to be accounted for in assessments of the internal loading of phosphorus and in potential
mitigation plans.
In coastal archipelago areas of the northern Baltic Sea, significantly higher phosphate concentrations (6.0 ±
4.5 μmol/l, mean ± SD) were measured in water samples close to the sediment surface compared with those
from 1 m above the seafloor (1.6± 2.0 μmol/l). The results indicated notable phosphate release from sediments
under the bottom water oxygen concentrations of up to 250 μmol/l, especially in areas that had experienced recent
temporal fluctuation between oxic and hypoxic/anoxic conditions. No single factor alone was found to control
the elevated PO4-P concentrations in the near-bottom water. In addition to the oxygen in the water, the
contents of potentially mobile phosphorus fractions, grain-size, the organic content at the sediment surface,
and the water depth were all important factors controlling the internal loading of phosphorus. The complexity
of this process needs to be accounted for in assessments of the internal loading of phosphorus and in potential
mitigation plans.


Keywords

Archipelago Sea, Baltic Sea, coastal eutrophication, Hypoxia, sediment phosphorus dynamics, Water quality


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Last updated on 2019-16-11 at 02:06