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The chemical speciation of iron in the north-east Atlantic Ocean

Boye, M., Aldrich, A., Berg, C. M. G. V. D., Jong, J. T. M. D., Nirmaier, H., Veldhuis, M., Timmermans, K. R. & Baar, H. J. W. D., 2006, In : Deep Sea Research Part I: Oceanographic Research Papers. 53, 4, p. 667-683 17 p.

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DOI

  • Marie Boye
  • Annette Aldrich
  • Constant M.G. van den Berg
  • Jeroen T.M. de Jong
  • Hans Nirmaier
  • Marcel Veldhuis
  • Klaas R. Timmermans
  • Hein J.W. de Baar
The distribution of dissolved iron and its chemical speciation (organic complexation and redox speciation) were studied in the northeastern Atlantic Ocean along 23°W between 37 and 42°N at depths between 0 and 2000 m, and in the upper-water column (upper 200 m) at two stations further east at 45°N10°W and 40°N17°W in the early spring of 1998. The iron speciation data are here combined with phytoplankton data to suggest cyanobacteria as a possible source for the iron binding ligands. The organic Fe-binding ligand concentrations were greater than that of dissolved iron by a factor of 1.5–5, thus maintaining iron in solution at levels well above it solubility. The water column distribution of the organic ligand indicates in-situ production of organic ligands by the plankton (consisting mainly of the cyanobacteria Synechococcus sp.) in the euphotic layer and a remineralisation from sinking biogenic particles in deeper waters. Fe(II) concentrations varied from below the detection limit (
Original languageEnglish
Pages (from-to)667-683
Number of pages17
JournalDeep Sea Research Part I: Oceanographic Research Papers
Volume53
Issue number4
Publication statusPublished - 2006

    Keywords

  • Atlantic Ocean, Iron speciation, Organic ligands, Iron

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