KEOPS2: Kerguelen Ocean and Plateau Study 2
KEOPS2: Kerguelen Ocean and Plateau Study 2
Editor(s): S. Blain, I. Obernosterer, B. Queguiner, T. Trull, and G. Herndl
The project KEOPS studies the impact of natural iron fertilization of the Southern Ocean on the functioning of the ecosystem and on the biogeochemical cycles. In this context the region around Kerguelen is an exceptional natural laboratory where in situ observations and experimentations could be conducted both in iron fertilized and non-fertilized regions. The main objectives are (i) to identify and quantify the sources and the pathways for iron fertilization, (ii) to study and quantify the impact of iron fertilization on the biogeochemical processes occurring in the water column and at the interfaces with air and sediment, (iii) to study the impact of iron fertilization on the structure of the ecosystem, from viruses to zooplankton, and to investigate how changes in biology affect biogeochemical fluxes. This special issue will gather publications of the results of the second oceanographic campaign (KEOPS2) that took place in October-November 2011. It will include comparisons with the results of the first campaign (January-February 2005) and with other previous natural or artificial iron fertilization experiments in the Southern Ocean.

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13 Nov 2015
Production regime and associated N cycling in the vicinity of Kerguelen Island, Southern Ocean
A. J. Cavagna, F. Fripiat, M. Elskens, P. Mangion, L. Chirurgien, I. Closset, M. Lasbleiz, L. Florez-Leiva, D. Cardinal, K. Leblanc, C. Fernandez, D. Lefèvre, L. Oriol, S. Blain, B. Quéguiner, and F. Dehairs
Biogeosciences, 12, 6515–6528,,, 2015
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01 Oct 2015
The biogeochemical structuring role of horizontal stirring: Lagrangian perspectives on iron delivery downstream of the Kerguelen Plateau
F. d'Ovidio, A. Della Penna, T. W. Trull, F. Nencioli, M.-I. Pujol, M.-H. Rio, Y.-H. Park, C. Cotté, M. Zhou, and S. Blain
Biogeosciences, 12, 5567–5581,,, 2015
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31 Jul 2015
Mesozooplankton structure and functioning during the onset of the Kerguelen phytoplankton bloom during the KEOPS2 survey
F. Carlotti, M.-P. Jouandet, A. Nowaczyk, M. Harmelin-Vivien, D. Lefèvre, P. Richard, Y. Zhu, and M. Zhou
Biogeosciences, 12, 4543–4563,,, 2015
29 Jul 2015
Iron budgets for three distinct biogeochemical sites around the Kerguelen Archipelago (Southern Ocean) during the natural fertilisation study, KEOPS-2
A. R. Bowie, P. van der Merwe, F. Quéroué, T. Trull, M. Fourquez, F. Planchon, G. Sarthou, F. Chever, A. T. Townsend, I. Obernosterer, J.-B. Sallée, and S. Blain
Biogeosciences, 12, 4421–4445,,, 2015
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25 Jun 2015
High variability in dissolved iron concentrations in the vicinity of the Kerguelen Islands (Southern Ocean)
F. Quéroué, G. Sarthou, H. F. Planquette, E. Bucciarelli, F. Chever, P. van der Merwe, D. Lannuzel, A. T. Townsend, M. Cheize, S. Blain, F. d'Ovidio, and A. R. Bowie
Biogeosciences, 12, 3869–3883,,, 2015
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23 Jun 2015
Carbon export in the naturally iron-fertilized Kerguelen area of the Southern Ocean based on the 234Th approach
F. Planchon, D. Ballas, A.-J. Cavagna, A. R. Bowie, D. Davies, T. Trull, E. C. Laurenceau-Cornec, P. Van Der Merwe, and F. Dehairs
Biogeosciences, 12, 3831–3848,,, 2015
09 Jun 2015
Carbon, oxygen and biological productivity in the Southern Ocean in and out the Kerguelen plume: CARIOCA drifter results
L. Merlivat, J. Boutin, and F. d'Ovidio
Biogeosciences, 12, 3513–3524,,, 2015
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02 Jun 2015
Export fluxes in a naturally iron-fertilized area of the Southern Ocean – Part 1: Seasonal dynamics of particulate organic carbon export from a moored sediment trap
M. Rembauville, I. Salter, N. Leblond, A. Gueneugues, and S. Blain
Biogeosciences, 12, 3153–3170,,, 2015
02 Jun 2015
Export fluxes in a naturally iron-fertilized area of the Southern Ocean – Part 2: Importance of diatom resting spores and faecal pellets for export
M. Rembauville, S. Blain, L. Armand, B. Quéguiner, and I. Salter
Biogeosciences, 12, 3171–3195,,, 2015
11 May 2015
Autonomous profiling float observations of the high-biomass plume downstream of the Kerguelen Plateau in the Southern Ocean
M. Grenier, A. Della Penna, and T. W. Trull
Biogeosciences, 12, 2707–2735,,, 2015
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26 Mar 2015
Fe and C co-limitation of heterotrophic bacteria in the naturally fertilized region off the Kerguelen Islands
I. Obernosterer, M. Fourquez, and S. Blain
Biogeosciences, 12, 1983–1992,,, 2015
24 Mar 2015
Dissolved greenhouse gases (nitrous oxide and methane) associated with the naturally iron-fertilized Kerguelen region (KEOPS 2 cruise) in the Southern Ocean
L. Farías, L. Florez-Leiva, V. Besoain, G. Sarthou, and C. Fernández
Biogeosciences, 12, 1925–1940,,, 2015
23 Mar 2015
Microbial iron uptake in the naturally fertilized waters in the vicinity of the Kerguelen Islands: phytoplankton–bacteria interactions
M. Fourquez, I. Obernosterer, D. M. Davies, T. W. Trull, and S. Blain
Biogeosciences, 12, 1893–1906,,, 2015
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17 Mar 2015
Early spring mesopelagic carbon remineralization and transfer efficiency in the naturally iron-fertilized Kerguelen area
S. H. M. Jacquet, F. Dehairs, D. Lefèvre, A. J. Cavagna, F. Planchon, U. Christaki, L. Monin, L. André, I. Closset, and D. Cardinal
Biogeosciences, 12, 1713–1731,,, 2015
05 Mar 2015
| Highlight paper
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
Biogeosciences, 12, 1415–1430,,, 2015
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05 Mar 2015
Nitrogen cycling in the Southern Ocean Kerguelen Plateau area: evidence for significant surface nitrification from nitrate isotopic compositions
F. Dehairs, F. Fripiat, A.-J. Cavagna, T. W. Trull, C. Fernandez, D. Davies, A. Roukaerts, D. Fonseca Batista, F. Planchon, and M. Elskens
Biogeosciences, 12, 1459–1482,,, 2015
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18 Feb 2015
Chemometric perspectives on plankton community responses to natural iron fertilisation over and downstream of the Kerguelen Plateau in the Southern Ocean
T. W. Trull, D. M. Davies, F. Dehairs, A.-J. Cavagna, M. Lasbleiz, E. C. Laurenceau-Cornec, F. d'Ovidio, F. Planchon, K. Leblanc, B. Quéguiner, and S. Blain
Biogeosciences, 12, 1029–1056,,, 2015
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17 Feb 2015
The relative importance of phytoplankton aggregates and zooplankton fecal pellets to carbon export: insights from free-drifting sediment trap deployments in naturally iron-fertilised waters near the Kerguelen Plateau
E. C. Laurenceau-Cornec, T. W. Trull, D. M. Davies, S. G. Bray, J. Doran, F. Planchon, F. Carlotti, M.-P. Jouandet, A.-J. Cavagna, A. M. Waite, and S. Blain
Biogeosciences, 12, 1007–1027,,, 2015
06 Feb 2015
Sourcing the iron in the naturally fertilised bloom around the Kerguelen Plateau: particulate trace metal dynamics
P. van der Merwe, A. R. Bowie, F. Quéroué, L. Armand, S. Blain, F. Chever, D. Davies, F. Dehairs, F. Planchon, G. Sarthou, A. T. Townsend, and T. W. Trull
Biogeosciences, 12, 739–755,,, 2015
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30 Jan 2015
Origin and fate of particulate and dissolved organic matter in a naturally iron-fertilized region of the Southern Ocean
L. Tremblay, J. Caparros, K. Leblanc, and I. Obernosterer
Biogeosciences, 12, 607–621,,, 2015
30 Jan 2015
Distributions and stoichiometry of dissolved nitrogen and phosphorus in the iron-fertilized region near Kerguelen (Southern Ocean)
S. Blain, J. Capparos, A. Guéneuguès, I. Obernosterer, and L. Oriol
Biogeosciences, 12, 623–635,,, 2015
11 Dec 2014
Validation of Thorpe-scale-derived vertical diffusivities against microstructure measurements in the Kerguelen region
Y.-H. Park, J.-H. Lee, I. Durand, and C.-S. Hong
Biogeosciences, 11, 6927–6937,,, 2014
08 Dec 2014
Enhanced viral production and virus-mediated mortality of bacterioplankton in a natural iron-fertilized bloom event above the Kerguelen Plateau
A. Malits, U. Christaki, I. Obernosterer, and M. G. Weinbauer
Biogeosciences, 11, 6841–6853,,, 2014
05 Dec 2014
Microbial food web dynamics during spring phytoplankton blooms in the naturally iron-fertilized Kerguelen area (Southern Ocean)
U. Christaki, D. Lefèvre, C. Georges, J. Colombet, P. Catala, C. Courties, T. Sime-Ngando, S. Blain, and I. Obernosterer
Biogeosciences, 11, 6739–6753,,, 2014
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26 Nov 2014
Wind-induced upwelling in the Kerguelen Plateau region
S. T. Gille, M. M. Carranza, R. Cambra, and R. Morrow
Biogeosciences, 11, 6389–6400,,, 2014
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30 Oct 2014
Pigments, elemental composition (C, N, P, and Si), and stoichiometry of particulate matter in the naturally iron fertilized region of Kerguelen in the Southern Ocean
M. Lasbleiz, K. Leblanc, S. Blain, J. Ras, V. Cornet-Barthaux, S. Hélias Nunige, and B. Quéguiner
Biogeosciences, 11, 5931–5955,,, 2014
21 Oct 2014
Seasonal evolution of net and regenerated silica production around a natural Fe-fertilized area in the Southern Ocean estimated with Si isotopic approaches
I. Closset, M. Lasbleiz, K. Leblanc, B. Quéguiner, A.-J. Cavagna, M. Elskens, J. Navez, and D. Cardinal
Biogeosciences, 11, 5827–5846,,, 2014
21 Oct 2014
Protist community composition during early phytoplankton blooms in the naturally iron-fertilized Kerguelen area (Southern Ocean)
C. Georges, S. Monchy, S. Genitsaris, and U. Christaki
Biogeosciences, 11, 5847–5863,,, 2014
20 Oct 2014
Taxon-specific responses of Southern Ocean diatoms to Fe enrichment revealed by synchrotron radiation FTIR microspectroscopy
O. Sackett, L. Armand, J. Beardall, R. Hill, M. Doblin, C. Connelly, J. Howes, B. Stuart, P. Ralph, and P. Heraud
Biogeosciences, 11, 5795–5808,,, 2014
20 Aug 2014
Rapid formation of large aggregates during the spring bloom of Kerguelen Island: observations and model comparisons
M.-P. Jouandet, G. A. Jackson, F. Carlotti, M. Picheral, L. Stemmann, and S. Blain
Biogeosciences, 11, 4393–4406,,, 2014
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