M. Arhan, H. Mercier, and Y. H. Park, On the deep water circulation of the eastern South Atlantic Ocean, Deep-Sea Res, Pt. I, vol.50, pp.889-916, 2003.

B. Beker and M. Boye, Phytoplankton assemblages in the Southern Ocean during the International Polar Year, Ocean Sci. Meeting, pp.22-26, 2010.

I. M. Belkin and A. L. Gordon, Southern Ocean fronts from the Greenwich meridian to Tasmania, Journal of Geophysical Research: Oceans, vol.18, issue.26, pp.3675-3696, 1996.
DOI : 10.1029/95JC02750

E. M. Bertrand, M. A. Saito, J. M. Rose, C. R. Riesselman, M. C. Lohan et al., and iron colimitation of phytoplankton growth in the Ross Sea, Limnology and Oceanography, vol.52, issue.3, pp.1079-1093, 2007.
DOI : 10.4319/lo.2007.52.3.1079

S. Bonnet, E. A. Webb, C. Panzeca, D. M. Karl, D. G. Capone et al., Vitamin B 12 excretion by cultures of the marine cyanobacteria Crocosphaera and Synechococcus, Limnol. Oceanogr, vol.55, 1959.

A. R. Bowie, D. J. Whitworth, E. P. Achterberg, R. F. Mantoura, and P. J. Worsfold, Biogeochemistry of Fe and other trace elements (Al, Co, Ni) in the upper Atlantic Ocean, Deep-Sea Res, pp.605-636, 2002.

J. Bown, M. Boye, A. Baker, E. Duvieilbourg, F. Lacan et al., The biogeochemical cycle of dissolved cobalt in the Atlantic and the Southern Ocean south off the coast of South Africa, Marine Chemistry, vol.126, issue.1-4, pp.193-206, 2011.
DOI : 10.1016/j.marchem.2011.03.008

URL : https://hal.archives-ouvertes.fr/hal-00635702

O. W. Duckworth, J. R. Bargar, A. A. Jarzecki, O. Oyerinde, T. G. Spiro et al., The exceptionally stable cobalt(III)???desferrioxamine B complex, Marine Chemistry, vol.113, issue.1-2, pp.114-122, 2009.
DOI : 10.1016/j.marchem.2009.01.003

H. Elderfield, R. J. Mccaffrey, N. Luedtke, M. Bender, and V. W. Truesdale, Chemical diagenesis in Narragansett Bay sediments, American Journal of Science, vol.281, issue.8, pp.1021-1055, 1981.
DOI : 10.2475/ajs.281.8.1021

M. J. Ellwood and C. M. Van-den-berg, Determination of organic complexation of cobalt in seawater by cathodic stripping voltammetry, Marine Chemistry, vol.75, issue.1-2, pp.33-47, 2001.
DOI : 10.1016/S0304-4203(01)00024-X

M. J. Ellwood, C. M. Van-den-berg, M. Boye, M. Veldhuis, J. T. De-jong et al., Organic complexation of cobalt across the Antarctic Polar Front in the Southern Ocean, Organic complexation of cobalt across the Antarctic Polar Front in the Southern Ocean, pp.1069-1075, 2005.
DOI : 10.1071/MF05097

S. Gladyshev, M. Arhan, A. Sokov, and S. Speich, A hydrographic section from South Africa to the southern limit of the Antarctic Circumpolar Current at the Greenwich meridian, Deep- Sea Res, Pt. I, vol.55, pp.1284-1303, 2008.

A. L. Gordon, R. F. Weiss, W. M. Smethie, and M. J. Warner, Thermocline and intermediate water communication between the south Atlantic and Indian oceans, Journal of Geophysical Research, vol.92, issue.C6, pp.7223-7240, 1992.
DOI : 10.1029/92JC00485

G. T. Gordon, C. W. Sullivan, and M. Boye, Vitamin B 12 and cobalt cycling among diatoms and bacteria in Antarctica sea ice microbial communities Chlorophyll-a and phaeopigments along BONUS-GoodHope section, Cruise report of MD166 BONUS-GoodHope in Biogeochemistry and Geochemistry, Boye, M. and the cruise participants, pp.1862-1877, 2008.

E. M. Hausrath, A. Neaman, and S. L. Brantley, Elemental release rates from dissolving basalt and granite with and without organic ligands, American Journal of Science, vol.309, issue.8, pp.633-660, 2009.
DOI : 10.2475/08.2009.01

D. Heggie and T. Lewis, Cobalt in pore waters of marine sediments, Nature, vol.35, issue.5985, pp.453-455, 1984.
DOI : 10.1038/311453a0

S. Huang and M. H. Conte, Source/process apportionment of major and trace elements in sinking particles in the Sargasso sea, Geochimica et Cosmochimica Acta, vol.73, issue.1, pp.65-90, 2009.
DOI : 10.1016/j.gca.2008.08.023

R. W. Jakuba, J. W. Moffett, and S. T. Dyhrman, Evidence for the linked biogeochemical cycling of zinc, cobalt, and phosphorus in the western North Atlantic Ocean, Global Biogeochemical Cycles, vol.42, issue.1, pp.10-1029, 2008.
DOI : 10.1029/2007GB003119

K. S. Johnson, K. H. Coale, W. M. Berelson, G. , and R. M. , On the formation of the manganese maximum in the oxygen minimum, Geochimica et Cosmochimica Acta, vol.60, issue.8, pp.1291-1299, 1996.
DOI : 10.1016/0016-7037(96)00005-1

W. R. Joubert, S. J. Thomalla, H. N. Waldron, M. I. Lucas, M. Boye et al., Nitrogen uptake by phytoplankton in the Atlantic sector of the Southern Ocean during late austral summer, Biogeosciences, vol.85194, pp.2947-295910, 2011.
URL : https://hal.archives-ouvertes.fr/hal-00641423

G. A. Knauer, J. H. Martin, G. , and R. M. , Cobalt in north-east Pacific waters, Cobalt in Northeast Pacific Waters, pp.49-51, 1982.
DOI : 10.1038/297049a0

L. Moigne, F. A. Boye, M. Masson, A. Corvaisier, R. Grossteffan et al., Description of the biogeochemical features of the subtropical southeastern Atlantic and the Southern Ocean south off South Africa during the austral summer of the International Polar Year, Biogeosciences Discussions, vol.9, issue.4, pp.5011-504810, 2012.
DOI : 10.5194/bgd-9-5011-2012

B. G. Lee and N. S. Fisher, Microbially mediated cobalt oxidation in seawater revealed by radiotracer experiments, Limnology and Oceanography, vol.38, issue.8, pp.1593-1602, 1993.
DOI : 10.4319/lo.1993.38.8.1593

M. T. Maldonado and N. M. Price, REDUCTION AND TRANSPORT OF ORGANICALLY BOUND IRON BY THALASSIOSIRA OCEANICA (BACILLARIOPHYCEAE), Journal of Phycology, vol.37, issue.2, pp.298-309, 2001.
DOI : 10.1046/j.1529-8817.2001.037002298.x

A. E. Martell and R. M. Smith, Critical stability constants, 1977.
DOI : 10.1007/978-1-4615-6761-5

D. W. Menzel and J. P. Spaeth, IN THE SARGASSO SEA1, Limnology and Oceanography, vol.7, issue.2, pp.151-154, 1962.
DOI : 10.4319/lo.1962.7.2.0151

J. W. Moffett and J. Ho, Oxidation of cobalt and manganese in seawater via a common microbially catalyzed pathway, Geochimica et Cosmochimica Acta, vol.60, issue.18, pp.3415-3424, 1996.
DOI : 10.1016/0016-7037(96)00176-7

F. M. Morel, A. J. Milligan, M. A. Saito, D. H. Heinrich, K. et al., Marine Bioinorganic Chemistry: The Role of Trace Metals in the Oceanic Cycles of Major Nutrients, Treatise on Geochemistry, pp.113-143, 2003.

A. E. Noble, M. A. Saito, K. Maiti, and C. R. Benitez-nelson, Cobalt, manganese, and iron near the Hawaiian Islands: A potential concentrating mechanism for cobalt within a cyclonic eddy and implications for the hybrid-type trace metals, Deep Sea Research Part II: Topical Studies in Oceanography, vol.55, issue.10-13
DOI : 10.1016/j.dsr2.2008.02.010

A. H. Orsi, T. Whitworth, and W. D. Nowlin, On the Meridional Extent and Fronts of the Antarctic Circumpolar Current, Deep- Sea Res, Pt. I, vol.42, pp.641-673, 1995.

F. Partensky, W. R. Hess, and D. Vaulot, Prochlorococcus, a marine photosynthetic prokaryote of global significance, Microbiol. Molecular Biol. Rev, vol.6399, pp.106-127, 1999.

A. R. Piola and A. L. Gordon, Intermediate Waters in the Southwest South-Atlantic, Deep-Sea Res, Pt. I, vol.36, pp.1-16, 1989.

J. L. Reid, On the total geostrophic circulation of the South Atlantic Ocean: Flow patterns, tracers, and transports, Progress in Oceanography, vol.23, issue.3, pp.149-244, 1989.
DOI : 10.1016/0079-6611(89)90001-3

I. Ruzic, Theoretical aspects of the direct titration of natural waters and its information yield for trace-metal speciation

M. A. Saito and J. W. Moffett, Complexation of cobalt by natural organic ligands in the Sargasso Sea as determined by a new high-sensitivity electrochemical cobalt speciation method suitable for open ocean work, Marine Chemistry, vol.75, issue.1-2, pp.49-68, 2001.
DOI : 10.1016/S0304-4203(01)00025-1

M. A. Saito, J. W. Moffett, and G. R. Ditullio, Cobalt and nickel in the Peru upwelling region: A major flux of labile cobalt utilized as a micronutrient, Global Biogeochemical Cycles, vol.28, issue.4, pp.10-1029, 2004.
DOI : 10.1029/2003GB002216

M. A. Saito, G. Rocap, and J. W. Moffett, feature at the Costa Rica upwelling dome, Limnology and Oceanography, vol.50, issue.1, pp.279-290, 2005.
DOI : 10.4319/lo.2005.50.1.0279

M. A. Saito, T. J. Goepfert, A. E. Noble, E. M. Bertrand, P. N. Sedwick et al., A seasonal study of dissolved cobalt in the Ross Sea, Antarctica: micronutrient behavior, absence of scavenging, and relationships with Zn, pp.4059-408210, 2010.

R. Schlitzer, Ocean Data View, 2012.

Y. Shaked, A. B. Kustka, and F. M. Morel, A general kinetic model for iron acquisition by eukaryotic phytoplankton, Limnology and Oceanography, vol.50, issue.3, pp.872-882, 2005.
DOI : 10.4319/lo.2005.50.3.0872

W. G. Sunda and S. A. Huntsman, Cobalt and zinc interreplacement in marine phytoplankton: Biological and geochemical implications, Limnology and Oceanography, vol.40, issue.8, pp.1404-1417, 1995.
DOI : 10.4319/lo.1995.40.8.1404

D. R. Turner, M. Whitfield, and A. G. Dickson, The equilibrium speciation of dissolved components in freshwater and sea water at 25??C and 1 atm pressure, Geochimica et Cosmochimica Acta, vol.45, issue.6, pp.855-881, 1979.
DOI : 10.1016/0016-7037(81)90115-0

T. Whitworth and W. D. Nowlin, Water masses and currents of the Southern Ocean at the Greenwich Meridian, Journal of Geophysical Research, vol.17, issue.26, pp.6462-6476, 1987.
DOI : 10.1029/JC092iC06p06462

Y. Xue and S. Traina, Oxidation Kinetics of Co(II)???EDTA in Aqueous and Semi-Aqueous Goethite Suspensions, Environmental Science & Technology, vol.30, issue.6, pp.1975-1981, 1996.
DOI : 10.1021/es950715f

R. J. Yang and C. M. Van-den-berg, Metal Complexation by Humic Substances in Seawater, Environmental Science & Technology, vol.43, issue.19, pp.7192-7197, 2009.
DOI : 10.1021/es900173w

H. Zhang, C. M. Van-den-berg, and R. Wollast, The determination of interactions of cobalt (II) with organic compounds in seawater using cathodic stripping voltammetry, Marine Chemistry, vol.28, issue.4, pp.285-300, 1990.
DOI : 10.1016/0304-4203(90)90049-I

Y. Zhang, N. Z. Jiao, H. , and N. , Comparative study of picoplankton biomass and community structure in different provinces from subarctic to subtropical oceans, Deep Sea Research Part II: Topical Studies in Oceanography, vol.55, issue.14-15
DOI : 10.1016/j.dsr2.2008.04.014

Y. Zhang, F. Lacan, and C. Jeandel, Dissolved rare earth elements tracing lithogenic inputs over the Kerguelen Plateau (Southern Ocean), Deep-Sea Res, Pt. II, vol.55, pp.638-652, 2008.