Articles | Volume 12, issue 21
Biogeosciences, 12, 6515–6528, 2015
https://doi.org/10.5194/bg-12-6515-2015

Special issue: KEOPS2: Kerguelen Ocean and Plateau Study 2

Biogeosciences, 12, 6515–6528, 2015
https://doi.org/10.5194/bg-12-6515-2015

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

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Arrigo, K. R., van Dijken, G. L., and Bushinsky, S.: Primary production in the Southern Ocean, 1997–2006, J. Geophys. Res., 113, C08004, https://doi.org/10.1029/2007JC004551, 2008.
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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.
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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.
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