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
Archambeau, A-S.; Pierre, C.; Poisson, A.; Schauer, B. (1998). 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(1-4): 25-38. https://dx.doi.org/10.1016/S0924-7963(98)00027-X In: Journal of Marine Systems. Elsevier: Tokyo; Oxford; New York; Amsterdam. ISSN 0924-7963; e-ISSN 1879-1573, more Also appears in:Le Fèvre, J.; Tréguer, P. (Ed.) (1998). Carbon Fluxes and Dynamic Processes in the Southern Ocean: Present and Past. Selected papers from the International JGOFS Symposium, Brest, France, 28-31 August 1995. Journal of Marine Systems, 17(1-4). Elsevier: Amsterdam. 1-619 pp., more |  |
| Keywords | Isotopes > Stable isotopes
Marine/Coastal |
| Authors | | Top | - Archambeau, A-S.
- Pierre, C.
- Poisson, A.
- Schauer, B.
| | |
| Abstract | This study presents oceanic distributions of stable isotopes (Full-size image (<1 K) of water and Full-size image (<1 K) of SCO2) and CFC-12 from samples collected during the CIVA1 cruise (February/March 1993), across the Southern Ocean, along a meridian section at 30°E, from South Africa (44°S) to Antarctica (70°S). The isotopic measurements show important variations between the subantarctic surface waters with Full-size image (<1 K) values and the antarctic surface waters with Full-size image (<1 K) values. The surface distributions of Full-size image (<1 K) values follow the major frontal oceanic structures; the vertical distribution shows the progressive upwelling from the subantarctic zone to the antarctic divergence of Full-size image (<1 K)-depleted CO2 derived from remineralization of organic matter. Along the Antarctic continental shelf, between 2500 and 4000 m, a core of water with Full-size image (<1 K) values close to -0.1‰ is associated with a relative maximum in CFC-12 concentration, although this core is not detected by its temperature and salinity parameters. This water mass, which corresponds to recently formed deep water, may originate from the eastward extension of the Weddell gyre or from bottom waters coming from the East and formed near Prydz Bay. |
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