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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Cited articles

Archambeau, A.-S., Pierre, C., Poisson, A., and Schauer, B.: Distributions of oxygen and carbon stable isotopes and CFC-12 in the water masses of the Southern Ocean at 30° E from South Africa to Antarctica: results of the CIVA1 cruise, J. Mar. Syst., 17, 25–38, 1998.
Bianchi, M., Feliatra, F., Tréguer, P., Vincendeau, M.-A., and Morvan, J.: Nitrification rates, ammonium and nitrate distribution in upper layers of the water column and in sediments of the Indian sector of the Southern Ocean, Deep-Sea Res. Pt. II, 44, 1017–1032, 1997.
Blain, S., Quéguiner, B., and Trull, T.: The natural iron fertilization experiment KEOPS (Kerguelen Ocean and Plateau compared Study): An overview, Deep-Sea Res. Pt. II, 55, 559–565, 2008.
Blain, S., Capparos, J., Guéneuguès, A., Obernosterer, I., and Oriol, L.: Distributions and stoichiometry of dissolved nitrogen and phosphorus in the iron fertilized region near Kerguelen (Southern Ocean), Biogeosciences, 12, 623–635, https://doi.org/10.5194/bg-12-623-2015, 2015.
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Short summary
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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