Articles | Volume 12, issue 5
Biogeosciences, 12, 1415–1430, 2015
https://doi.org/10.5194/bg-12-1415-2015

Special issue: KEOPS2: Kerguelen Ocean and Plateau Study 2

Biogeosciences, 12, 1415–1430, 2015
https://doi.org/10.5194/bg-12-1415-2015
Research article
 | Highlight paper
05 Mar 2015
Research article  | Highlight paper | 05 Mar 2015

Use of Ra isotopes to deduce rapid transfer of sediment-derived inputs off Kerguelen

V. Sanial et al.

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Cited articles

Annett, A. L., Henley, S. F., Van Beek, P., Souhaut, M., Ganeshram, R., Venables, H. J., Meredith, M. P., and Geibert, W.: Use of radium isotopes to estimate mixing rates and trace sediment inputs to surface waters in northern Marguerite Bay, Antarctic Peninsula, Antarct. Sci., 25, 445–456, https://doi.org/10.1017/S0954102012000892, 2013
Arrigo, K. R., van Dijken, G. L., and Bushinsky, S.: Primary production in the Southern Ocean, 1997–2006, J. Geophys. Res.-Oceans, 113, C08004, https://doi.org/10.1029/2007JC004551, 2008.
Belkin, I. M. and Gordon, A. L.: Southern Ocean fronts from the Greenwich meridian to Tasmania, J. Geophys. Res.-Oceans, 101, 3675–3696, https://doi.org/10.1029/95JC02750, 1996.
Blain, S., Tréguer, P., Belviso, S., Bucciarelli, E., Denis, M., Desabre, S., Fiala, M., Martin Jézéquel, V., Le Fèvre, J., Mayzaud, P., Marty, J.-C., and Razouls, S.: A biogeochemical study of the island mass effect in the context of the iron hypothesis: Kerguelen Islands, Southern Ocean, Deep Sea Res. Pt. I, 48, 163–187, https://doi.org/10.1016/S0967-0637(00)00047-9, 2001.
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Short summary
We investigated the origin and mechanisms of the natural iron fertilization that sustains a phytoplankton bloom downstream of the Kerguelen Islands. We used radium isotopes to trace the fate of shelf waters that may transport iron and other micronutrients towards offshore waters. We show that shelf waters are rapidly transferred offshore and may be transported across the polar front (PF). The PF may thus not be a strong physical barrier for chemical elements released by the shelf sediments.
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