Articles | Volume 18, issue 19
https://doi.org/10.5194/bg-18-5265-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-18-5265-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
30 Sep 2021
Research article |
| 30 Sep 2021
| 30 Sep 2021
Comparing CLE-AdCSV applications using SA and TAC to determine the Fe-binding characteristics of model ligands in seawater
Loes J. A. Gerringa
CORRESPONDING AUTHOR
Royal Netherlands Institute for Sea Research (NIOZ), Department of
Ocean Systems, Texel, the Netherlands
Martha Gledhill
GEOMAR Helmholtz Centre for Ocean Research, 24148 Kiel, Germany
Indah Ardiningsih
Royal Netherlands Institute for Sea Research (NIOZ), Department of
Ocean Systems, Texel, the Netherlands
Niels Muntjewerf
Royal Netherlands Institute for Sea Research (NIOZ), Department of
Ocean Systems, Texel, the Netherlands
Luis M. Laglera
FI-TRACE, Departamento de Química and Laboratori
Interdisciplinari sobre Canvi Climàtic, Universidad de las Islas Baleares,
Palma, Balearic Islands 07122, Spain
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Organic Fe speciation is investigated along a natural gradient of the western Antarctic Peninsula from an ice-covered shelf to the open ocean. The two major fronts in the region affect the distribution of ligands. The excess ligands not bound to dissolved Fe (DFe) comprised up to 80 % of the total ligand concentrations, implying the potential to solubilize additional Fe input. The ligands on the shelf can increase the DFe residence time and fuel local primary production upon ice melt.
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Iron (Fe) is an essential micronutrient for marine organisms. In the Peruvian oxygen minimum zone, controversies exist regarding mechanisms governing temporal Fe supply. Here, we demonstrate that El Niño modulated Peru-Chile Undercurrent intensification is key influencing the variations in sediment-derived shelf-to-slope Fe plume in Peruvian anoxic waters. In contrast, we show that organic ligand complexation and authigenic Fe formation control Fe biogeochemistry in offshore anoxic waters.
Indah Ardiningsih, Kyyas Seyitmuhammedov, Sylvia G. Sander, Claudine H. Stirling, Gert-Jan Reichart, Kevin R. Arrigo, Loes J. A. Gerringa, and Rob Middag
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Short summary
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Organic Fe speciation is investigated along a natural gradient of the western Antarctic Peninsula from an ice-covered shelf to the open ocean. The two major fronts in the region affect the distribution of ligands. The excess ligands not bound to dissolved Fe (DFe) comprised up to 80 % of the total ligand concentrations, implying the potential to solubilize additional Fe input. The ligands on the shelf can increase the DFe residence time and fuel local primary production upon ice melt.
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Short summary
For 3 decades, competitive ligand exchange–adsorptive cathodic stripping voltammetry was used to estimate the Fe-binding capacity of organic matter in seawater. In this paper the performance of the competing ligands is compared through the analysis of a series of model ligands.
The main finding of this paper is that the determined speciation parameters are not independent of the application, making interpretation of Fe speciation data more complex than it was thought before.
For 3 decades, competitive ligand exchange–adsorptive cathodic stripping voltammetry was used to...
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