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Aquatic Geochemistry

, Volume 18, Issue 6, pp 543–564 | Cite as

Benthic Phosphorus Dynamics in the Gulf of Finland, Baltic Sea

  • Lena Viktorsson
  • Elin Almroth-Rosell
  • Anders Tengberg
  • Roman Vankevich
  • Ivan Neelov
  • Alexey Isaev
  • Victor Kravtsov
  • Per O. J. Hall
Original Paper

Abstract

Benthic fluxes of soluble reactive phosphorus (SRP) and dissolved inorganic carbon (DIC) were measured in situ using autonomous landers in the Gulf of Finland in the Baltic Sea, on four expeditions between 2002 and 2005. These measurements together with model estimates of bottom water oxygen conditions were used to compute the magnitude of the yearly integrated benthic SRP flux (also called internal phosphorus load). The yearly integrated benthic SRP flux was found to be almost 10 times larger than the external (river and land sources) phosphorus load. The average SRP flux was 1.25 ± 0.56 mmol m−2 d−1 on anoxic bottoms, and −0.01 ± 0.08 mmol m−2 d−1 on oxic bottoms. The bottom water oxygen conditions determined whether the SRP flux was in a high or low regime, and degradation of organic matter (as estimated from benthic DIC fluxes) correlated positively with SRP fluxes on anoxic bottoms. From this correlation, we estimated a potential increase in phosphorus flux of 0.69 ± 0.26 mmol m−2 d−1 from presently oxic bottoms, if they would turn anoxic. An almost full annual data set of in situ bottom water oxygen measurements showed high variability of oxygen concentration. Because of this, an estimate of the time which the sediments were exposed to oxygenated overlying bottom water was computed using a coupled thermohydrodynamic ocean–sea and ecosystem model. Total phosphorus burial rates were calculated from vertical profiles of total phosphorus in sediment and sediment accumulation rates. Recycling and burial efficiencies for phosphorus of 97 and 3%, respectively, were estimated for anoxic accumulation bottoms from a benthic mass balance, which was based on the measured effluxes and burial rates.

Keywords

Sediment Fluxes Burial Oxic-anoxic Gulf of Finland Baltic Sea 

Notes

Acknowledgments

We thank the Finnish Environment Institute (SYKE), and especially Paula Väänänen, for deploying and recovering the long-term moorings, and Henrik Andersson for assistance during expeditions. Constructive criticism from two anonymous reviewers improved the manuscript. This study was financially supported by the EU through the INTAS program and HYPOX project, as well as by the Swedish Research Councils FORMAS and VR. The senior authors of this paper have sincerely enjoyed and benefited from the years of scientific collaboration with Bjorn Sundby. Those years were special. This paper is dedicated to him.

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Lena Viktorsson
    • 1
  • Elin Almroth-Rosell
    • 2
  • Anders Tengberg
    • 2
  • Roman Vankevich
    • 3
  • Ivan Neelov
    • 4
  • Alexey Isaev
    • 4
  • Victor Kravtsov
    • 5
  • Per O. J. Hall
    • 2
  1. 1.Department of Earth SciencesUniversity of GothenburgGothenburgSweden
  2. 2.Department of Chemistry, Marine ChemistryUniversity of GothenburgGothenburgSweden
  3. 3.SPb Scientific Research Center for Environmental SafetySaint-PetersburgRussia
  4. 4.Russian State Hydrometeorological UniversitySaint-PetersburgRussia
  5. 5.Atlantic Branch of P.P Shirshov Institute of OceanologyRussian Academy of Science (ABIORAS)KaliningradRussia

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