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| Titel |
High variability in dissolved iron concentrations in the vicinity of the Kerguelen Islands (Southern Ocean) |
| VerfasserIn |
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 |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 12 ; Nr. 12, no. 12 (2015-06-25), S.3869-3883 |
| Datensatznummer |
250118000
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| Publikation (Nr.) |
 copernicus.org/bg-12-3869-2015.pdf |
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| Zusammenfassung |
| 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. |
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