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01-09-2014 | Report | Issue 5/2014 Open Access

Ambio 5/2014

A New Phosphorus Paradigm for the Baltic Proper

Journal:
Ambio > Issue 5/2014
Authors:
Anders Stigebrandt, Lars Rahm, Lena Viktorsson, Malin Ödalen, Per O. J. Hall, Bengt Liljebladh
Important notes

Electronic supplementary material

The online version of this article (doi:10.​1007/​s13280-013-0441-3) contains supplementary material, which is available to authorized users.

Abstract

The external phosphorus (P) loading has been halved, but the P content in the water column and the area of anoxic bottoms in Baltic proper has increased during the last 30 years. This can be explained by a temporary internal source of dissolved inorganic phosphorus (DIP) that is turned on when the water above the bottom sediment becomes anoxic. A load-response model, explaining the evolution from 1980 to 2005, suggests that the average specific DIP flux from anoxic bottoms in the Baltic proper is about 2.3 g P m−2 year−1. This is commensurable with fluxes estimated in situ from anoxic bottoms in the open Baltic proper and from hydrographic data in the deep part of Bornholm Basin. Oxygenation of anoxic bottoms, natural or manmade, may quickly turn off the internal P source from anoxic bottoms. This new P-paradigm should have far-reaching implications for abatement of eutrophication in the Baltic proper.

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Supplementary Material
Supplementary material 1 (PDF 165 kb)
13280_2013_441_MOESM_ESM.pdf
Literature
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