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-1 in offshore, Southern Ocean waters to 3.82 nmol L-1 within...
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ftird:oai:ird.fr:fdi:010064771 2023-05-15T17:02:01+02:00 High variability in dissolved iron concentrations in the vicinity of the Kerguelen Islands (Southern Ocean) Queroue, F. Sarthou, G. Planquette, H. F. Bucciarelli, Eva Chever, F. van der Merwe, P. Lannuzel, D. Townsend, A. T. Cheize, M. Blain, S. d'Ovidio, F. Bowie, A. R. OCEAN AUSTRAL KERGUELEN 2015 text/pdf http://www.documentation.ird.fr/hor/fdi:010064771 EN eng http://www.documentation.ird.fr/hor/fdi:010064771 oai:ird.fr:fdi:010064771 Queroue F., Sarthou G., Planquette H. F., Bucciarelli Eva, Chever F., van der Merwe P., Lannuzel D., Townsend A. T., Cheize M., Blain S., d'Ovidio F., Bowie A. R. High variability in dissolved iron concentrations in the vicinity of the Kerguelen Islands (Southern Ocean). Biogeosciences, 2015, 12 (12), p. 3869-3883. text 2015 ftird 2020-08-21T06:52:40Z 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-1 in offshore, Southern Ocean waters to 3.82 nmol L-1 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-1 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. Text Kerguelen Islands Southern Ocean IRD (Institute de recherche pour le développement): Horizon Southern Ocean Austral Kerguelen Kerguelen Islands Hillsborough Bay ENVELOPE(69.775,69.775,-49.219,-49.219) |
institution |
Open Polar |
collection |
IRD (Institute de recherche pour le développement): Horizon |
op_collection_id |
ftird |
language |
English |
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-1 in offshore, Southern Ocean waters to 3.82 nmol L-1 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-1 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. |
format |
Text |
author |
Queroue, F. Sarthou, G. Planquette, H. F. Bucciarelli, Eva Chever, F. van der Merwe, P. Lannuzel, D. Townsend, A. T. Cheize, M. Blain, S. d'Ovidio, F. Bowie, A. R. |
spellingShingle |
Queroue, F. Sarthou, G. Planquette, H. F. Bucciarelli, Eva Chever, F. van der Merwe, P. Lannuzel, D. Townsend, A. T. Cheize, M. Blain, S. d'Ovidio, F. Bowie, A. R. High variability in dissolved iron concentrations in the vicinity of the Kerguelen Islands (Southern Ocean) |
author_facet |
Queroue, F. Sarthou, G. Planquette, H. F. Bucciarelli, Eva Chever, F. van der Merwe, P. Lannuzel, D. Townsend, A. T. Cheize, M. Blain, S. d'Ovidio, F. Bowie, A. R. |
author_sort |
Queroue, F. |
title |
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_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_sort |
high variability in dissolved iron concentrations in the vicinity of the kerguelen islands (southern ocean) |
publishDate |
2015 |
url |
http://www.documentation.ird.fr/hor/fdi:010064771 |
op_coverage |
OCEAN AUSTRAL KERGUELEN |
long_lat |
ENVELOPE(69.775,69.775,-49.219,-49.219) |
geographic |
Southern Ocean Austral Kerguelen Kerguelen Islands Hillsborough Bay |
geographic_facet |
Southern Ocean Austral Kerguelen Kerguelen Islands Hillsborough Bay |
genre |
Kerguelen Islands Southern Ocean |
genre_facet |
Kerguelen Islands Southern Ocean |
op_relation |
http://www.documentation.ird.fr/hor/fdi:010064771 oai:ird.fr:fdi:010064771 Queroue F., Sarthou G., Planquette H. F., Bucciarelli Eva, Chever F., van der Merwe P., Lannuzel D., Townsend A. T., Cheize M., Blain S., d'Ovidio F., Bowie A. R. High variability in dissolved iron concentrations in the vicinity of the Kerguelen Islands (Southern Ocean). Biogeosciences, 2015, 12 (12), p. 3869-3883. |
_version_ |
1766055236871389184 |