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 = 106 m3 s-1) across the central Weddell Sea and to intensify...
Published in: | Journal of Geophysical Research: Oceans |
---|---|
Main Authors: | , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2014
|
Subjects: | |
Online Access: | https://eprints.soton.ac.uk/364845/ https://eprints.soton.ac.uk/364845/1/jgrc20685.pdf |
id |
ftsouthampton:oai:eprints.soton.ac.uk:364845 |
---|---|
record_format |
openpolar |
spelling |
ftsouthampton:oai:eprints.soton.ac.uk:364845 2023-08-27T04:04:27+02:00 The contribution of the Weddell Gyre to the lower limb of the global overturning circulation Jullion, Loïc Naveira Garabato, Alberto C. Bacon, Sheldon Meredith, Michael P. Brown, Pete J. Torres-Valdés, Sinhué Speer, Kevin G. Holland, Paul R. Dong, Jun Bakker, Dorothée Hoppema, Mario Loose, Brice Venables, Hugh J. Jenkins, William J. Messias, Marie-José Fahrbach, Eberhard 2014-06 text https://eprints.soton.ac.uk/364845/ https://eprints.soton.ac.uk/364845/1/jgrc20685.pdf en English eng https://eprints.soton.ac.uk/364845/1/jgrc20685.pdf Jullion, Loïc, Naveira Garabato, Alberto C., Bacon, Sheldon, Meredith, Michael P., Brown, Pete J., Torres-Valdés, Sinhué, Speer, Kevin G., Holland, Paul R., Dong, Jun, Bakker, Dorothée, Hoppema, Mario, Loose, Brice, Venables, Hugh J., Jenkins, William J., Messias, Marie-José 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), 3357-3377. (doi:10.1002/2013JC009725 <http://dx.doi.org/10.1002/2013JC009725>). Article PeerReviewed 2014 ftsouthampton https://doi.org/10.1002/2013JC009725 2023-08-03T22:20:34Z 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 mid-latitude 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 mid-gyre 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 Southampton: e-Prints Soton Antarctic Indian Southern Ocean The Antarctic Weddell Weddell Sea Journal of Geophysical Research: Oceans 119 6 3357 3377 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
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 = 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 mid-latitude 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 mid-gyre 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, Loïc Naveira Garabato, Alberto C. Bacon, Sheldon Meredith, Michael P. Brown, Pete J. Torres-Valdés, Sinhué Speer, Kevin G. Holland, Paul R. Dong, Jun Bakker, Dorothée Hoppema, Mario Loose, Brice Venables, Hugh J. Jenkins, William J. Messias, Marie-José Fahrbach, Eberhard |
spellingShingle |
Jullion, Loïc Naveira Garabato, Alberto C. Bacon, Sheldon Meredith, Michael P. Brown, Pete J. Torres-Valdés, Sinhué Speer, Kevin G. Holland, Paul R. Dong, Jun Bakker, Dorothée Hoppema, Mario Loose, Brice Venables, Hugh J. Jenkins, William J. Messias, Marie-José Fahrbach, Eberhard The contribution of the Weddell Gyre to the lower limb of the global overturning circulation |
author_facet |
Jullion, Loïc Naveira Garabato, Alberto C. Bacon, Sheldon Meredith, Michael P. Brown, Pete J. Torres-Valdés, Sinhué Speer, Kevin G. Holland, Paul R. Dong, Jun Bakker, Dorothée Hoppema, Mario Loose, Brice Venables, Hugh J. Jenkins, William J. Messias, Marie-José Fahrbach, Eberhard |
author_sort |
Jullion, Loïc |
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://eprints.soton.ac.uk/364845/ https://eprints.soton.ac.uk/364845/1/jgrc20685.pdf |
geographic |
Antarctic Indian Southern Ocean The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Indian Southern Ocean The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Sea ice Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean Weddell Sea |
op_relation |
https://eprints.soton.ac.uk/364845/1/jgrc20685.pdf Jullion, Loïc, Naveira Garabato, Alberto C., Bacon, Sheldon, Meredith, Michael P., Brown, Pete J., Torres-Valdés, Sinhué, Speer, Kevin G., Holland, Paul R., Dong, Jun, Bakker, Dorothée, Hoppema, Mario, Loose, Brice, Venables, Hugh J., Jenkins, William J., Messias, Marie-José 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), 3357-3377. (doi:10.1002/2013JC009725 <http://dx.doi.org/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 |
_version_ |
1775351523454222336 |