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., 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
    University of East Anglia > Faculty of Science > Research Groups > Marine and Atmospheric Sciences
    University of East Anglia > Faculty of Science > Research Groups > Climate, Ocean and Atmospheric Sciences
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    Depositing User: Pure Connector
    Date Deposited: 01 Dec 2016 00:03
    Last Modified: 25 Jul 2018 12:58
    URI: https://ueaeprints.uea.ac.uk/id/eprint/61558
    DOI: 10.1016/j.pocean.2016.11.005

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