South Atlantic Interbasin Exchanges of Mass, Heat, Salt and Anthropogenic Carbon

Evans, G.R., McDonagh, E.L., King, B.A., Bryden, H.L., Bakker, D.C.E. ORCID: https://orcid.org/0000-0001-9234-5337, Brown, P.J., Schuster, U., Speer, K.G. and van Heuven, S.M.A.C. (2017) South Atlantic Interbasin Exchanges of Mass, Heat, Salt and Anthropogenic Carbon. Progress in Oceanography, 151. 62–82. ISSN 0079-6611

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Abstract

The exchange of mass, heat, salt and anthropogenic carbon (Cant) between the South Atlantic, south of 24°S, and adjacent ocean basins is estimated from hydrographic data obtained during 2008-2009 using an inverse method. Transports of anthropogenic carbon are calculated across the western (Drake Passage), eastern (30°E) and northern (24°S) boundaries. The freshwater overturning transport of 0.09 Sv is southward, consistent with an overturning circulation that exports freshwater from the North Atlantic, and consistent with a bistable Meridional Overturning Circulation (MOC), under conditions of excess freshwater perturbation. At 30°E, net eastward Antarctic Circumpolar Current (ACC) transport, south of the Subtropical Front, is compensated by a 15.9±2.3 Sv westward flow along the Antarctic boundary. The region as a whole is a substantial sink for atmospheric anthropogenic carbon of 0.51±0.37 PgC yr-1, of which 0.18±0.12 PgC yr-1 accumulates and is stored within the water column. At 24°S, a 20.2 Sv meridional overturning is associated with a 0.11 PgC yr-1 Cant overturning. The remainder is transported into the Atlantic Ocean north of 24°S (0.28±0.16 PgC yr-1) and Indian sector of Southern Ocean (1.12±0.43 PgC yr-1), having been enhanced by inflow through Drake Passage (1.07±0.44 PgC yr-1). This underlines the importance of the South Atlantic as a crucial element of the anthropogenic carbon sink in the global oceans.

Item Type: Article
Faculty \ School: Faculty of Science > School of Environmental Sciences
Related URLs:
Depositing User: Pure Connector
Date Deposited: 01 Dec 2016 00:03
Last Modified: 22 Oct 2022 01:56
URI: https://ueaeprints.uea.ac.uk/id/eprint/61558
DOI: 10.1016/j.pocean.2016.11.005

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