Articles | Volume 12, issue 5
Biogeosciences, 12, 1459–1482, 2015
https://doi.org/10.5194/bg-12-1459-2015

Special issue: KEOPS2: Kerguelen Ocean and Plateau Study 2

Biogeosciences, 12, 1459–1482, 2015
https://doi.org/10.5194/bg-12-1459-2015
Research article
05 Mar 2015
Research article | 05 Mar 2015

Nitrogen cycling in the Southern Ocean Kerguelen Plateau area: evidence for significant surface nitrification from nitrate isotopic compositions

F. Dehairs et al.

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We investigated the nitrate N, O isotopic composition for the Southern Ocean Kerguelen Plateau area, aiming at understanding the N-cycling in this naturally iron fertilized area characterized by large recurrent phytoplankton blooms. The system is characterized by moderate consumption of nitrate over the season while silicic acid, on the contrary, becomes depleted, suggesting significant recycling of N. Mixed layer nitrate isotopic signatures corroborate this.
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