High variability in dissolved iron concentrations in the vicinity of the Kerguelen Islands (Southern Ocean)
Dissolved Fe (dFe) concentrations were measured in the upper 1300 m of the water column in the vicinity of the Kerguelen Islands as part of the second KErguelen Ocean Plateau compared Study (KEOPS2). Concentrations ranged from 0.06 nmol L<sup>−1</sup> in offshore, Southern Ocean waters t...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2015-06-01
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| Series: | Biogeosciences |
| Online Access: | http://www.biogeosciences.net/12/3869/2015/bg-12-3869-2015.pdf |
| _version_ | 1819138564856741888 |
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| author | F. Quéroué G. Sarthou H. F. Planquette E. Bucciarelli F. Chever P. van der Merwe D. Lannuzel A. T. Townsend M. Cheize S. Blain F. d'Ovidio A. R. Bowie |
| author_facet | F. Quéroué G. Sarthou H. F. Planquette E. Bucciarelli F. Chever P. van der Merwe D. Lannuzel A. T. Townsend M. Cheize S. Blain F. d'Ovidio A. R. Bowie |
| author_sort | F. Quéroué |
| collection | DOAJ |
| description | Dissolved Fe (dFe) concentrations were measured in the upper 1300 m of the
water column in the vicinity of the Kerguelen Islands as part of the second
KErguelen Ocean Plateau compared Study (KEOPS2). Concentrations ranged from
0.06 nmol L<sup>−1</sup> in offshore, Southern Ocean waters to 3.82 nmol L<sup>−1</sup>
within Hillsborough Bay, on the north-eastern coast of the Kerguelen Islands.
Direct island runoff, glacial melting and resuspended sediments were
identified as important inputs of dFe that could potentially fertilise the
northern part of the plateau. A significant deep dFe enrichment was observed
over the plateau with dFe concentrations increasing up to 1.30 nmol L<sup>−1</sup>
close to the seafloor, probably due to sediment resuspension and pore water
release. Biological uptake was shown to induce a significant decrease in dFe
concentrations between two visits (28 days apart) at a station above the
plateau. Our work also considered other processes and sources, such as
lateral advection of enriched seawater, remineralisation processes, and the
influence of the polar front (PF) as a vector for Fe transport. Overall,
heterogeneous sources of Fe over and off the Kerguelen Plateau, in addition
to strong variability in Fe supply by vertical or horizontal transport, may
explain the high variability in dFe concentrations observed during this
study. |
| first_indexed | 2024-12-22T11:08:47Z |
| format | Article |
| id | doaj.art-688a5065f1724de0964578bb5c25a940 |
| institution | Directory Open Access Journal |
| issn | 1726-4170 1726-4189 |
| language | English |
| last_indexed | 2024-12-22T11:08:47Z |
| publishDate | 2015-06-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Biogeosciences |
| spelling | doaj.art-688a5065f1724de0964578bb5c25a9402022-12-21T18:28:12ZengCopernicus PublicationsBiogeosciences1726-41701726-41892015-06-0112123869388310.5194/bg-12-3869-2015High variability in dissolved iron concentrations in the vicinity of the Kerguelen Islands (Southern Ocean)F. Quéroué0G. Sarthou1H. F. Planquette2E. Bucciarelli3F. Chever4P. van der Merwe5D. Lannuzel6A. T. Townsend7M. Cheize8S. Blain9F. d'Ovidio10A. R. Bowie11Université de Bretagne Occidentale, IUEM, 29200 Brest, FranceLEMAR-UMR 6539, CNRS-UBO-IRD-IFREMER, Place Nicolas Copernic, 29280 Plouzané, FranceLEMAR-UMR 6539, CNRS-UBO-IRD-IFREMER, Place Nicolas Copernic, 29280 Plouzané, FranceUniversité de Bretagne Occidentale, IUEM, 29200 Brest, FranceLEMAR-UMR 6539, CNRS-UBO-IRD-IFREMER, Place Nicolas Copernic, 29280 Plouzané, FranceAntarctic Climate & Ecosystems Cooperative Research Centre, University of Tasmania, Hobart, TAS 7001, AustraliaInstitute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS 7001, AustraliaCentral Science Laboratory, University of Tasmania, Hobart, TAS 7001, AustraliaLEMAR-UMR 6539, CNRS-UBO-IRD-IFREMER, Place Nicolas Copernic, 29280 Plouzané, FranceLaboratoire Océanographie Biologique de Banyuls sur Mer, Université Pierre et Marie Curie, Paris 06, quai Fontaulé, 66650 Banyuls sur Mer, FranceSorbonne Universités (UPMC, Univ Paris 06)-CNRS-IRD-MNHN, LOCEAN-IPSL, 4 place Jussieu, 75005 Paris, FranceInstitute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS 7001, AustraliaDissolved Fe (dFe) concentrations were measured in the upper 1300 m of the water column in the vicinity of the Kerguelen Islands as part of the second KErguelen Ocean Plateau compared Study (KEOPS2). Concentrations ranged from 0.06 nmol L<sup>−1</sup> in offshore, Southern Ocean waters to 3.82 nmol L<sup>−1</sup> within Hillsborough Bay, on the north-eastern coast of the Kerguelen Islands. Direct island runoff, glacial melting and resuspended sediments were identified as important inputs of dFe that could potentially fertilise the northern part of the plateau. A significant deep dFe enrichment was observed over the plateau with dFe concentrations increasing up to 1.30 nmol L<sup>−1</sup> close to the seafloor, probably due to sediment resuspension and pore water release. Biological uptake was shown to induce a significant decrease in dFe concentrations between two visits (28 days apart) at a station above the plateau. Our work also considered other processes and sources, such as lateral advection of enriched seawater, remineralisation processes, and the influence of the polar front (PF) as a vector for Fe transport. Overall, heterogeneous sources of Fe over and off the Kerguelen Plateau, in addition to strong variability in Fe supply by vertical or horizontal transport, may explain the high variability in dFe concentrations observed during this study.http://www.biogeosciences.net/12/3869/2015/bg-12-3869-2015.pdf |
| spellingShingle | F. Quéroué G. Sarthou H. F. Planquette E. Bucciarelli F. Chever P. van der Merwe D. Lannuzel A. T. Townsend M. Cheize S. Blain F. d'Ovidio A. R. Bowie High variability in dissolved iron concentrations in the vicinity of the Kerguelen Islands (Southern Ocean) Biogeosciences |
| title | High variability in dissolved iron concentrations in the vicinity of the Kerguelen Islands (Southern Ocean) |
| title_full | High variability in dissolved iron concentrations in the vicinity of the Kerguelen Islands (Southern Ocean) |
| title_fullStr | High variability in dissolved iron concentrations in the vicinity of the Kerguelen Islands (Southern Ocean) |
| title_full_unstemmed | High variability in dissolved iron concentrations in the vicinity of the Kerguelen Islands (Southern Ocean) |
| title_short | High variability in dissolved iron concentrations in the vicinity of the Kerguelen Islands (Southern Ocean) |
| title_sort | high variability in dissolved iron concentrations in the vicinity of the kerguelen islands southern ocean |
| url | http://www.biogeosciences.net/12/3869/2015/bg-12-3869-2015.pdf |
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