Temporal changes in ventilation and the carbonate system in the Atlantic sector of the Southern Ocean
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AuthorsTanhua, T. (Toste); Hoppema, M. (Mario); Jones, E. M. (Elizabeth M.); Stöven, T. (Tim); Hauck, J. (Judith); González-Dávila, M. (Melchor); Santana-Casiano, M. (Magdalena); Álvarez, M. (Marta); Strass, V. H. (Volker H.)
The Southern Ocean is the most important area of anthropogenic carbon (Cant) uptake in the world ocean, only rivalled in importance by the North Atlantic Ocean. Significant variability on decadal time-scales in the uptake of Cant in the Southern Ocean has been observed and modelled, likely with consequences for the interior ocean storage of Cant in the region, and implications for the global carbon budget. Here we use eight cruises between 1973 and 2012 to assess decadal variability in Cant storage rates in the southeast Atlantic sector of the Southern Ocean. For this we employed the extended multiple linear regression (eMLR) method. We relate variability in DIC (dissolved inorganic carbon) storage, which is assumed to equal anthropogenic carbon storage, to changes in ventilation as observed from repeat measurements of transient tracers. Within the Antarctic Intermediate Water (AAIW) layer, which is the dominant transport conduit for Cant into the interior ocean, moderate Cant storage ...
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