Summer and winter distribution of δ<sup>13</sup>C<sub>DIC</sub> in surface waters of the South Indian Ocean [20°S-60°S] - Université Pierre et Marie Curie Accéder directement au contenu
Article Dans Une Revue Tellus B - Chemical and Physical Meteorology Année : 2010

Summer and winter distribution of δ13CDIC in surface waters of the South Indian Ocean [20°S-60°S]

Résumé

This paper describes for the first time the summer and winter distributions of sea surface δ13CDIC in the Southern Indian Ocean (20°S-60°S). For this we used δ13CDIC measurements from 10 cruises conducted between 1998 and 2005. For summer and winter, the highest δ13CDIC values (>2‰) are observed in sub-Antarctic waters (40°S-50°S) and attributed mainly to biological activity, enhanced in the vicinity of Crozet and Kerguelen Archipelagoes. The lowest δ13CDIC values are found in subtropical waters (25°S-35°S), with a minimum (<1‰) in the Agulhas Current region and in the Mozambique channel. On the seasonal scale, δ13CDIC is higher during summer than during winter in all regions. The largest seasonal amplitude of variation (~0.3‰), observed in the region 35°S-40°S, is attributed to biological activity during summer and to deep vertical mixing during winter. In subtropical oligotrophic waters, the mean seasonal amplitude of variation (~0.15‰) is mainly explained by air-sea CO2 fluxes. On the interannual scale, we also identified a large negative anomaly of δ13CDIC in the subtropical waters during austral summer 2002, associated to an anomalous ocean CO2 sink due to cold conditions during this period.

Dates et versions

hal-00759242 , version 1 (30-11-2012)

Identifiants

Citer

Virginie Racapé, Claire Lo Monaco, Nicolas Metzl, Catherine Pierre. Summer and winter distribution of δ13CDIC in surface waters of the South Indian Ocean [20°S-60°S]. Tellus B - Chemical and Physical Meteorology, 2010, 62, pp.660-673. ⟨10.1111/J.1600-0889.2010.00504.X⟩. ⟨hal-00759242⟩
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