Articles | Volume 12, issue 5
https://doi.org/10.5194/bg-12-1415-2015
https://doi.org/10.5194/bg-12-1415-2015
Research article
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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, P. van Beek, B. Lansard, M. Souhaut, E. Kestenare, F. d'Ovidio, M. Zhou, and S. Blain

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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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