The contribution of the Weddell Gyre to the lower limb of the Global Overturning Circulation
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 +/- 8 Sv (1 Sv = 10^6 m3 s–1) across the central Weddell Sea and to intens...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | https://ueaeprints.uea.ac.uk/id/eprint/49936/ https://doi.org/10.1002/2013JC009725 |
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ftuniveastangl:oai:ueaeprints.uea.ac.uk:49936 2023-05-15T14:04:48+02:00 The contribution of the Weddell Gyre to the lower limb of the Global Overturning Circulation Jullion, Loic Naveira Garabato, Alberto C. Bacon, Sheldon Meredith, Mike P. Brown, Peter J. Torres-Valdes, Sinhue Speer, Kevin G. Holland, Paul R. Dong, Jun Bakker, Dorothee C. E. Hoppema, Mario Loose, Brice Venables, Hugh J Jenkins, William J. Messias, Marie-Jose Fahrbach, Eberhard 2014-06 https://ueaeprints.uea.ac.uk/id/eprint/49936/ https://doi.org/10.1002/2013JC009725 unknown Jullion, Loic, Naveira Garabato, Alberto C., Bacon, Sheldon, Meredith, Mike P., Brown, Peter J., Torres-Valdes, Sinhue, Speer, Kevin G., Holland, Paul R., Dong, Jun, Bakker, Dorothee C. E., Hoppema, Mario, Loose, Brice, Venables, Hugh J, Jenkins, William J., Messias, Marie-Jose and Fahrbach, Eberhard (2014) The contribution of the Weddell Gyre to the lower limb of the Global Overturning Circulation. Journal of Geophysical Research - Oceans, 119 (6). pp. 3357-3377. ISSN 2169-9275 doi:10.1002/2013JC009725 Article PeerReviewed 2014 ftuniveastangl https://doi.org/10.1002/2013JC009725 2023-03-23T23:32:05Z 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 +/- 8 Sv (1 Sv = 10^6 m3 s–1) across the central Weddell Sea and to intensify to 54 +/- 15 Sv further offshore. This circulation injects 36 +/-13 TW of heat from the Antarctic Circumpolar Current to the gyre, and exports 51 +/- 23 mSv of freshwater, including 1361 mSv as sea ice to the midlatitude Southern Ocean. The gyre’s overturning circulation has an asymmetric double-cell structure, in which 13 +/- 4 Sv of Circumpolar Deep Water (CDW) and relatively light Antarctic Bottom Water (AABW) are transformed into upper-ocean water masses by midgyre upwelling (at a rate of 2 +/- 2 Sv) and into denser AABW by downwelling focussed at the western boundary (8 +/- 2 Sv). The gyre circulation exhibits a substantial throughflow component, by which CDW and AABW enter the gyre from the Indian sector, undergo ventilation 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 +/- 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. Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean Weddell Sea University of East Anglia: UEA Digital Repository Antarctic Southern Ocean The Antarctic Weddell Sea Indian Weddell Journal of Geophysical Research: Oceans 119 6 3357 3377 |
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Open Polar |
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University of East Anglia: UEA Digital Repository |
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ftuniveastangl |
language |
unknown |
description |
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 +/- 8 Sv (1 Sv = 10^6 m3 s–1) across the central Weddell Sea and to intensify to 54 +/- 15 Sv further offshore. This circulation injects 36 +/-13 TW of heat from the Antarctic Circumpolar Current to the gyre, and exports 51 +/- 23 mSv of freshwater, including 1361 mSv as sea ice to the midlatitude Southern Ocean. The gyre’s overturning circulation has an asymmetric double-cell structure, in which 13 +/- 4 Sv of Circumpolar Deep Water (CDW) and relatively light Antarctic Bottom Water (AABW) are transformed into upper-ocean water masses by midgyre upwelling (at a rate of 2 +/- 2 Sv) and into denser AABW by downwelling focussed at the western boundary (8 +/- 2 Sv). The gyre circulation exhibits a substantial throughflow component, by which CDW and AABW enter the gyre from the Indian sector, undergo ventilation 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 +/- 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. |
format |
Article in Journal/Newspaper |
author |
Jullion, Loic Naveira Garabato, Alberto C. Bacon, Sheldon Meredith, Mike P. Brown, Peter J. Torres-Valdes, Sinhue Speer, Kevin G. Holland, Paul R. Dong, Jun Bakker, Dorothee C. E. Hoppema, Mario Loose, Brice Venables, Hugh J Jenkins, William J. Messias, Marie-Jose Fahrbach, Eberhard |
spellingShingle |
Jullion, Loic Naveira Garabato, Alberto C. Bacon, Sheldon Meredith, Mike P. Brown, Peter J. Torres-Valdes, Sinhue Speer, Kevin G. Holland, Paul R. Dong, Jun Bakker, Dorothee C. E. Hoppema, Mario Loose, Brice Venables, Hugh J Jenkins, William J. Messias, Marie-Jose Fahrbach, Eberhard The contribution of the Weddell Gyre to the lower limb of the Global Overturning Circulation |
author_facet |
Jullion, Loic Naveira Garabato, Alberto C. Bacon, Sheldon Meredith, Mike P. Brown, Peter J. Torres-Valdes, Sinhue Speer, Kevin G. Holland, Paul R. Dong, Jun Bakker, Dorothee C. E. Hoppema, Mario Loose, Brice Venables, Hugh J Jenkins, William J. Messias, Marie-Jose Fahrbach, Eberhard |
author_sort |
Jullion, Loic |
title |
The contribution of the Weddell Gyre to the lower limb of the Global Overturning Circulation |
title_short |
The contribution of the Weddell Gyre to the lower limb of the Global Overturning Circulation |
title_full |
The contribution of the Weddell Gyre to the lower limb of the Global Overturning Circulation |
title_fullStr |
The contribution of the Weddell Gyre to the lower limb of the Global Overturning Circulation |
title_full_unstemmed |
The contribution of the Weddell Gyre to the lower limb of the Global Overturning Circulation |
title_sort |
contribution of the weddell gyre to the lower limb of the global overturning circulation |
publishDate |
2014 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/49936/ https://doi.org/10.1002/2013JC009725 |
geographic |
Antarctic Southern Ocean The Antarctic Weddell Sea Indian Weddell |
geographic_facet |
Antarctic Southern Ocean The Antarctic Weddell Sea Indian Weddell |
genre |
Antarc* Antarctic Sea ice Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean Weddell Sea |
op_relation |
Jullion, Loic, Naveira Garabato, Alberto C., Bacon, Sheldon, Meredith, Mike P., Brown, Peter J., Torres-Valdes, Sinhue, Speer, Kevin G., Holland, Paul R., Dong, Jun, Bakker, Dorothee C. E., Hoppema, Mario, Loose, Brice, Venables, Hugh J, Jenkins, William J., Messias, Marie-Jose and Fahrbach, Eberhard (2014) The contribution of the Weddell Gyre to the lower limb of the Global Overturning Circulation. Journal of Geophysical Research - Oceans, 119 (6). pp. 3357-3377. ISSN 2169-9275 doi:10.1002/2013JC009725 |
op_doi |
https://doi.org/10.1002/2013JC009725 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
119 |
container_issue |
6 |
container_start_page |
3357 |
op_container_end_page |
3377 |
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1766276142880260096 |