Articles | Volume 18, issue 15
https://doi.org/10.5194/bg-18-4587-2021
© 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-18-4587-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
11 Aug 2021
Research article |
| 11 Aug 2021
| 11 Aug 2021
Fe-binding organic ligands in coastal and frontal regions of the western Antarctic Peninsula
Indah Ardiningsih
CORRESPONDING AUTHOR
Department of Ocean Systems, NIOZ Royal Netherlands Institute for Sea Research and Utrecht University, Texel, 1797SH, the
Netherlands
Kyyas Seyitmuhammedov
Centre for Trace Element Analysis and Chemistry Department, University
of Otago, Dunedin, New Zealand
Sylvia G. Sander
International Atomic Energy Agency, 4a Quai Antoine 1er, 98000,
Principality of Monaco, Monaco
Claudine H. Stirling
Centre for Trace Element Analysis and Chemistry Department, University
of Otago, Dunedin, New Zealand
Gert-Jan Reichart
Department of Ocean Systems, NIOZ Royal Netherlands Institute for Sea Research and Utrecht University, Texel, 1797SH, the
Netherlands
Faculty of Geosciences, Earth Sciences Department, Utrecht University, Utrecht, 3512JE, the
Netherlands
Kevin R. Arrigo
Department of Earth System Science, Stanford University, USA
Loes J. A. Gerringa
Department of Ocean Systems, NIOZ Royal Netherlands Institute for Sea Research and Utrecht University, Texel, 1797SH, the
Netherlands
Rob Middag
Department of Ocean Systems, NIOZ Royal Netherlands Institute for Sea Research and Utrecht University, Texel, 1797SH, the
Netherlands
Centre for Trace Element Analysis and Chemistry Department, University
of Otago, Dunedin, New Zealand
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Foraminifera are calcifying organisms that play a role in the marine inorganic-carbon cycle and are widely used to reconstruct paleoclimates. However, the fundamental process by which they calcify remains essentially unknown. Here we use inhibitors to show that an enzyme is speeding up the conversion between bicarbonate and CO2. This helps the foraminifera acquire sufficient carbon for calcification and might aid their tolerance to elevated CO2 level.
Linda K. Dämmer, Lennart de Nooijer, Erik van Sebille, Jan G. Haak, and Gert-Jan Reichart
Clim. Past, 16, 2401–2414, https://doi.org/10.5194/cp-16-2401-2020, https://doi.org/10.5194/cp-16-2401-2020, 2020
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The compositions of foraminifera shells often vary with environmental parameters such as temperature or salinity; thus, they can be used as proxies for these environmental variables. Often a single proxy is influenced by more than one parameter. Here, we show that while salinity impacts shell Na / Ca, temperature has no effect. We also show that the combination of different proxies (Mg / Ca and δ18O) to reconstruct salinity does not seem to work as previously thought.
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Short summary
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.
Organic Fe speciation is investigated along a natural gradient of the western Antarctic...
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