The contribution of the Weddell Gyre to the lower limb of the Global Overturning Circulation
Author Posting. © American Geophysical Union, 2014. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 119 (2014): 3357–3377, doi:10.1002/2013JC009725. The h...
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Language: | English |
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Online Access: | https://hdl.handle.net/1912/6852 |
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/6852 2023-05-15T13:48:31+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, Michael 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 2014-06-05 application/postscript application/x-tex application/pdf https://hdl.handle.net/1912/6852 en_US eng John Wiley & Sons https://doi.org/10.1002/2013JC009725 Journal of Geophysical Research: Oceans 119 (2014): 3357–3377 https://hdl.handle.net/1912/6852 doi:10.1002/2013JC009725 Journal of Geophysical Research: Oceans 119 (2014): 3357–3377 doi:10.1002/2013JC009725 Weddell Sea Southern Ocean Meridional overturning circulation Oceanography Sea ice Climate Article 2014 ftwhoas https://doi.org/10.1002/2013JC009725 2022-12-24T23:57:09Z Author Posting. © American Geophysical Union, 2014. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 119 (2014): 3357–3377, doi:10.1002/2013JC009725. 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 = 106 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 13 ± 1 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. The ANDREX project was supported by the National Environmental Research Council (NE/E01366X/1). L.J. also acknowledges financial support from NSF (OCE-1231803). 2014-12-05 Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean Weddell Sea Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Antarctic Southern Ocean The Antarctic Weddell Sea Indian Weddell Journal of Geophysical Research: Oceans 119 6 3357 3377 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Weddell Sea Southern Ocean Meridional overturning circulation Oceanography Sea ice Climate |
spellingShingle |
Weddell Sea Southern Ocean Meridional overturning circulation Oceanography Sea ice Climate Jullion, Loic Naveira Garabato, Alberto C. Bacon, Sheldon Meredith, Michael 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 |
topic_facet |
Weddell Sea Southern Ocean Meridional overturning circulation Oceanography Sea ice Climate |
description |
Author Posting. © American Geophysical Union, 2014. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 119 (2014): 3357–3377, doi:10.1002/2013JC009725. 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 = 106 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 13 ± 1 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. The ANDREX project was supported by the National Environmental Research Council (NE/E01366X/1). L.J. also acknowledges financial support from NSF (OCE-1231803). 2014-12-05 |
format |
Article in Journal/Newspaper |
author |
Jullion, Loic Naveira Garabato, Alberto C. Bacon, Sheldon Meredith, Michael 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_facet |
Jullion, Loic Naveira Garabato, Alberto C. Bacon, Sheldon Meredith, Michael 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 |
publisher |
John Wiley & Sons |
publishDate |
2014 |
url |
https://hdl.handle.net/1912/6852 |
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_source |
Journal of Geophysical Research: Oceans 119 (2014): 3357–3377 doi:10.1002/2013JC009725 |
op_relation |
https://doi.org/10.1002/2013JC009725 Journal of Geophysical Research: Oceans 119 (2014): 3357–3377 https://hdl.handle.net/1912/6852 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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1766249394236030976 |