Articles | Volume 12, issue 21
Biogeosciences, 12, 6515–6528, 2015

Special issue: KEOPS2: Kerguelen Ocean and Plateau Study 2

Biogeosciences, 12, 6515–6528, 2015

Research article 13 Nov 2015

Research article | 13 Nov 2015

Production regime and associated N cycling in the vicinity of Kerguelen Island, Southern Ocean

A. J. Cavagna et al.

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Cited articles

Aminot, A. and Kérouel, R.: Dosage automatique des nutriments dans les eaux marines: methods en flux continu, Ed. Ifremer, 2007.
Arrigo, K. R., van Dijken, G. L., and Bushinsky, S.: Primary production in the Southern Ocean, 1997–2006, J. Geophys. Res., 113, C08004,, 2008.
Bianchi, M., Feliatra, F., Tréguer, P., Vincedeau, 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. Part II, 44, 1017–1032, 1997.
Blackburn, T. H.: A method for measuring rates of NH4+ turnover in anoxic marine sediments using a 15N-NH4+ dilution technique, Appl. Environ. Microbiol., 37, 760–765, 1979.
Blain, S., Tréguer, P., Belviso, S., Bucciarelli, E., Denis, M., Desabre, S., Fiala, M., Jezequel, V. M., Lefevre, J., Mayzaud, M., 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. Part I, 48, 163–187, 2001.
Short summary
Primary production, NO3- and NH4+ uptake, and nitrification rates were measured during the KEOPS 2 cruise (austral spring 2011) in the Kerguelen Plateau area. Natural iron fertilization stimulated primary production which is much higher in the fertilized areas compared to the HNLC site. We report high rates of nitrification in the mixed layer below the euphotic zone. We conclude that high productivity in deep mixing system stimulates the N cycle by increasing both assimilation and regeneration.
Final-revised paper