%0 Journal Article
%T The contribution of the Weddell Gyre to the lower limb of the Global Overturning Circulation
%+ Institut méditerranéen d'océanologie (MIO)
%+ Nathional Oceanography Centre
%+ National Oceanography Centre (NOC)
%+ British Antarctic Survey (BAS)
%+ University of East Anglia [Norwich] (UEA)
%+ National Oceanography Centre [Southampton] (NOC)
%+ Florida State University [Tallahassee] (FSU)
%+ Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI)
%+ University of Rhode Island
%+ Woods Hole Oceanographic Institution (WHOI)
%A Jullion, Loïc
%A Naveira Garabato, Alberto C.
%A Bacon, Sheldon
%A Meredith, Michael P.
%A J. Brown, Peter
%A Torres-Valdés, Sinhue
%A Speer, Kevin
%A Holland, Paul, H.
%A Dong, Jun
%A Bakker, Dorothée
%A Hoppema, Mario
%A Loose, Brice
%A Venables, Hugh J.
%A Jenkins, William, J.
%A Messias, Marie-José
%A Fahrbach, Eberhard
%< avec comité de lecture
%@ 2169-9275
%J Journal of Geophysical Research. Oceans
%I Wiley-Blackwell
%V 119
%N 6
%P 3357-3377
%8 2014-06-05
%D 2014
%R 10.1002/2013JC009725
%Z Sciences of the Universe [physics]/Ocean, AtmosphereJournal articles
%X The horizontal and vertical circulation of the Weddell Gyre is diagnosed using a box inverse model constructed with recent hydrographic sections and including mobile sea ice and eddy transports. The gyre is found to convey 42 6 8 Sv (1 Sv 5 106 m3 s–1) across the central Weddell Sea and to intensify to 54 6 15 Sv further offshore. This circulation injects 36 6 13 TW of heat from the Antarctic Circumpolar Current to the gyre, and exports 51 6 23 mSv of freshwater, including 13 6 1 mSv as sea ice to the midlati- tude Southern Ocean. The gyre’s overturning circulation has an asymmetric double-cell structure, in which 13 6 4 Sv of Circumpolar Deep Water (CDW) and relatively light Antarctic Bottom Water (AABW) are trans- formed into upper-ocean water masses by midgyre upwelling (at a rate of 2 6 2 Sv) and into denser AABW by downwelling focussed at the western boundary (8 6 2 Sv). The gyre circulation exhibits a substantial throughflow component, by which CDW and AABW enter the gyre from the Indian sector, undergo ventila- tion and densification within the gyre, and are exported to the South Atlantic across the gyre’s northern rim. The relatively modest net production of AABW in the Weddell Gyre (6 6 2 Sv) suggests that the gyre’s prominence in the closure of the lower limb of global oceanic overturning stems largely from the recycling and equatorward export of Indian-sourced AABW.
%G English
%2 https://hal.science/hal-01255764/document
%2 https://hal.science/hal-01255764/file/andrex_jgr_final_withfig.pdf
%L hal-01255764
%U https://hal.science/hal-01255764
%~ IRD
%~ INSU
%~ UNIV-TLN
%~ CNRS
%~ UNIV-AMU
%~ MIO
%~ OSU-INSTITUT-PYTHEAS
%~ GIP-BE