Influence of organic complexation on dissolved iron distribution in East Antarctic pack ice
Since Antarctic sea ice covers an area larger than the Antarctic continent itself, the discovery that it can fertilize the Southern Ocean with iron (Fe) has fostered a new breadth of research in recent years. In order to test the hypothesis that Fe-binding organic ligands control the distribution of...
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Online Access: | https://eprints.utas.edu.au/43175/ https://doi.org/10.1016/j.marchem.2018.04.005 |
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ftunivtasmania:oai:eprints.utas.edu.au:43175 2023-05-15T13:41:50+02:00 Influence of organic complexation on dissolved iron distribution in East Antarctic pack ice Genovese, C Grotti, M Pittaluga, J Ardini, F Janssens, J Wuttig, K Moreau, S Lannuzel, D 2018 https://eprints.utas.edu.au/43175/ https://doi.org/10.1016/j.marchem.2018.04.005 unknown Elsevier Science Bv Genovese, C, Grotti, M, Pittaluga, J, Ardini, F, Janssens, J, Wuttig, K orcid:0000-0003-4010-5918 , Moreau, S orcid:0000-0001-9446-812X and Lannuzel, D orcid:0000-0001-6154-1837 2018 , 'Influence of organic complexation on dissolved iron distribution in East Antarctic pack ice' , Marine Chemistry, vol. 203 , pp. 28-37 , doi:10.1016/j.marchem.2018.04.005 <http://dx.doi.org/10.1016/j.marchem.2018.04.005>. sea ice ligands iron Antarctica pack ice Southern Ocean Article PeerReviewed 2018 ftunivtasmania https://doi.org/10.1016/j.marchem.2018.04.005 2022-02-14T23:18:17Z Since Antarctic sea ice covers an area larger than the Antarctic continent itself, the discovery that it can fertilize the Southern Ocean with iron (Fe) has fostered a new breadth of research in recent years. In order to test the hypothesis that Fe-binding organic ligands control the distribution of dissolved iron (DFe) in Antarctic pack ice, iron organic speciation was investigated in samples collected during the Sea Ice Physics and Ecosystem eXperiment-2 (SIPEX-2) voyage in Austral winter/spring 2012. Dissolved Fe was measured using sector field inductively coupled plasma mass spectrometry, and iron organic speciation parameters were determined by competitive ligand equilibration - adsorptive cathodic stripping voltammetry method, using 1-nitroso-2-naphthol (NN) as the added ligand. The concentration of Fe-binding organic ligands (Lt) ranged from 4.9 nM to 41 nM (average of 14.9 ± 8.4 nM, n = 34), and was always higher than the corresponding DFe (average of 7.5 ± 4.5 nM, n = 34). Conditional stability constants (log K′Fe’L = 11.7–13.0) were similar to those previously observed in land-fast ice. Concentrations of DFe and Lt displayed similar depth profiles; their strong correlation (Spearman's ρ = 0.80, p 1). Estimates showed that pack ice would have released 0.45 μmol/m2/d of Lt during spring melt, 0.21 μmol/m2/d of which are free from Fe binding, and hence available for further complexation. Therefore, it is suggested that this excess of Fe-free ligands may play a key role in controlling the solubility of free or newly formed Fe in surface waters before the peak of primary production, outcompeting the Fe-binding organic ligands already present in seawater. Article in Journal/Newspaper Antarc* Antarctic Antarctica Sea ice Southern Ocean University of Tasmania: UTas ePrints Antarctic Southern Ocean The Antarctic Austral Marine Chemistry 203 28 37 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
unknown |
topic |
sea ice ligands iron Antarctica pack ice Southern Ocean |
spellingShingle |
sea ice ligands iron Antarctica pack ice Southern Ocean Genovese, C Grotti, M Pittaluga, J Ardini, F Janssens, J Wuttig, K Moreau, S Lannuzel, D Influence of organic complexation on dissolved iron distribution in East Antarctic pack ice |
topic_facet |
sea ice ligands iron Antarctica pack ice Southern Ocean |
description |
Since Antarctic sea ice covers an area larger than the Antarctic continent itself, the discovery that it can fertilize the Southern Ocean with iron (Fe) has fostered a new breadth of research in recent years. In order to test the hypothesis that Fe-binding organic ligands control the distribution of dissolved iron (DFe) in Antarctic pack ice, iron organic speciation was investigated in samples collected during the Sea Ice Physics and Ecosystem eXperiment-2 (SIPEX-2) voyage in Austral winter/spring 2012. Dissolved Fe was measured using sector field inductively coupled plasma mass spectrometry, and iron organic speciation parameters were determined by competitive ligand equilibration - adsorptive cathodic stripping voltammetry method, using 1-nitroso-2-naphthol (NN) as the added ligand. The concentration of Fe-binding organic ligands (Lt) ranged from 4.9 nM to 41 nM (average of 14.9 ± 8.4 nM, n = 34), and was always higher than the corresponding DFe (average of 7.5 ± 4.5 nM, n = 34). Conditional stability constants (log K′Fe’L = 11.7–13.0) were similar to those previously observed in land-fast ice. Concentrations of DFe and Lt displayed similar depth profiles; their strong correlation (Spearman's ρ = 0.80, p 1). Estimates showed that pack ice would have released 0.45 μmol/m2/d of Lt during spring melt, 0.21 μmol/m2/d of which are free from Fe binding, and hence available for further complexation. Therefore, it is suggested that this excess of Fe-free ligands may play a key role in controlling the solubility of free or newly formed Fe in surface waters before the peak of primary production, outcompeting the Fe-binding organic ligands already present in seawater. |
format |
Article in Journal/Newspaper |
author |
Genovese, C Grotti, M Pittaluga, J Ardini, F Janssens, J Wuttig, K Moreau, S Lannuzel, D |
author_facet |
Genovese, C Grotti, M Pittaluga, J Ardini, F Janssens, J Wuttig, K Moreau, S Lannuzel, D |
author_sort |
Genovese, C |
title |
Influence of organic complexation on dissolved iron distribution in East Antarctic pack ice |
title_short |
Influence of organic complexation on dissolved iron distribution in East Antarctic pack ice |
title_full |
Influence of organic complexation on dissolved iron distribution in East Antarctic pack ice |
title_fullStr |
Influence of organic complexation on dissolved iron distribution in East Antarctic pack ice |
title_full_unstemmed |
Influence of organic complexation on dissolved iron distribution in East Antarctic pack ice |
title_sort |
influence of organic complexation on dissolved iron distribution in east antarctic pack ice |
publisher |
Elsevier Science Bv |
publishDate |
2018 |
url |
https://eprints.utas.edu.au/43175/ https://doi.org/10.1016/j.marchem.2018.04.005 |
geographic |
Antarctic Southern Ocean The Antarctic Austral |
geographic_facet |
Antarctic Southern Ocean The Antarctic Austral |
genre |
Antarc* Antarctic Antarctica Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Sea ice Southern Ocean |
op_relation |
Genovese, C, Grotti, M, Pittaluga, J, Ardini, F, Janssens, J, Wuttig, K orcid:0000-0003-4010-5918 , Moreau, S orcid:0000-0001-9446-812X and Lannuzel, D orcid:0000-0001-6154-1837 2018 , 'Influence of organic complexation on dissolved iron distribution in East Antarctic pack ice' , Marine Chemistry, vol. 203 , pp. 28-37 , doi:10.1016/j.marchem.2018.04.005 <http://dx.doi.org/10.1016/j.marchem.2018.04.005>. |
op_doi |
https://doi.org/10.1016/j.marchem.2018.04.005 |
container_title |
Marine Chemistry |
container_volume |
203 |
container_start_page |
28 |
op_container_end_page |
37 |
_version_ |
1766158829729349632 |