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.; van Heuven, S.M.A.C.

doi:10.1016/j.pocean.2016.11.005

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South Atlantic interbasin exchanges of mass, heat, salt and anthropogenic carbon

2017
By Evans, G.R. ; McDonagh, E.L. ; King, B.A. ; ...
Source: Progress in Oceanography, 151, 62-82

[PDF-3.30 MB]

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Journal Title:

Progress in Oceanography
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Evans, G.R. ; McDonagh, E.L. ; King, B.A. ; Bryden, H.L. ; Bakker, D.C.E. ; ... More +

Evans, G.R. ; McDonagh, E.L. ; King, B.A. ; Bryden, H.L. ; Bakker, D.C.E. ; Brown, P.J. ; Schuster, U. ; Speer, K.G. ; van Heuven, S.M.A.C. Less -
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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 Pg C yr−1, of which 0.18 ± 0.12 Pg C 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 Pg C yr−1 Cant overturning. The remainder is transported into the Atlantic Ocean north of 24°S (0.28 ± 0.16 Pg C yr−1) and Indian sector of Southern Ocean (1.12 ± 0.43 Pg C yr−1), having been enhanced by inflow through Drake Passage (1.07 ± 0.44 Pg C yr−1). This underlines the importance of the South Atlantic as a crucial element of the anthropogenic carbon sink in the global oceans.
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Aquatic Science Geology
Source:

Progress in Oceanography, 151, 62-82
DOI:

https://doi.org/10.1016/j.pocean.2016.11.005
ISSN:

0079-6611
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PDF
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Elsevier BV
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Journal Article
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urn:sha256:7f3c247218705be9ee0386faf525cc62df5ffb34924370fc666ac7165c8540e6
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https://repository.library.noaa.gov/view/noaa/57468/noaa_57468_DS1.pdf
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South Atlantic interbasin exchanges of mass, heat, salt and anthropogenic carbon

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