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High variability in dissolved iron concentrations in the vicinity of the Kerguelen Islands (Southern Ocean)

Citation

Queroue, F and Sarthou, G and Planquette, HF and Bucciarelli, E and Chever, F and van der Merwe, P and Lannuzel, D and Townsend, AT and Cheize, M and Blain, S and d'Ovidio, F and Bowie, AR, High variability in dissolved iron concentrations in the vicinity of the Kerguelen Islands (Southern Ocean), Biogeosciences, 12, (12) pp. 3869-3883. ISSN 1726-4170 (2015) [Refereed Article]


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Copyright 2015 The Authors Licenced under Creative Commons Attribution 3.0 License http://creativecommons.org/licenses/by/3.0/

DOI: doi:10.5194/bg-12-3869-2015

Abstract

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.

Item Details

Item Type:Refereed Article
Keywords:Fe, dissolved iron, Southern Ocean, Kerguelen Island
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Chemical Oceanography
Objective Division:Environment
Objective Group:Physical and Chemical Conditions of Water
Objective Field:Physical and Chemical Conditions of Water in Marine Environments
UTAS Author:Queroue, F (Mr Fabien Queroue)
UTAS Author:van der Merwe, P (Dr Pier van der Merwe)
UTAS Author:Lannuzel, D (Associate Professor Delphine Lannuzel)
UTAS Author:Townsend, AT (Associate Professor Ashley Townsend)
UTAS Author:Bowie, AR (Associate Professor Andrew Bowie)
ID Code:103856
Year Published:2015
Web of Science® Times Cited:13
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2015-10-28
Last Modified:2017-10-31
Downloads:339 View Download Statistics

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