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://epic.awi.de/id/eprint/35943/ https://epic.awi.de/id/eprint/35943/1/andrex_jgr_final_withfig.pdf https://doi.org/10.1002/2013JC009725 https://hdl.handle.net/10013/epic.43854 https://hdl.handle.net/10013/epic.43854.d001 |
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ftawi:oai:epic.awi.de:35943 2024-09-15T17:46:27+00:00 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, Sinhue 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 application/pdf https://epic.awi.de/id/eprint/35943/ https://epic.awi.de/id/eprint/35943/1/andrex_jgr_final_withfig.pdf https://doi.org/10.1002/2013JC009725 https://hdl.handle.net/10013/epic.43854 https://hdl.handle.net/10013/epic.43854.d001 unknown Wiley https://epic.awi.de/id/eprint/35943/1/andrex_jgr_final_withfig.pdf https://hdl.handle.net/10013/epic.43854.d001 Jullion, L. , Naveira Garabato, A. C. , Bacon, S. , Meredith, M. P. , Brown, P. J. , Torres-Valdés, S. , Speer, K. G. , Holland, P. R. , Dong, J. , Bakker, D. , Hoppema, M. orcid:0000-0002-2326-619X , Loose, B. , Venables, H. J. , Jenkins, W. J. , Messias, M. J. and Fahrbach, E. (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 . doi:10.1002/2013JC009725 <https://doi.org/10.1002/2013JC009725> , hdl:10013/epic.43854 EPIC3Journal of Geophysical Research: Oceans, Wiley, 119(6), pp. 3357-3377, ISSN: 2169-9291 Article isiRev 2014 ftawi https://doi.org/10.1002/2013JC009725 2024-06-24T04:09:53Z 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 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. Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean Weddell Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Journal of Geophysical Research: Oceans 119 6 3357 3377 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
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 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. |
format |
Article in Journal/Newspaper |
author |
Jullion, Loïc Naveira Garabato, Alberto C. Bacon, Sheldon Meredith, Michael P. Brown, Pete J. Torres-Valdés, Sinhue 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, Sinhue 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, Sinhue 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 |
publisher |
Wiley |
publishDate |
2014 |
url |
https://epic.awi.de/id/eprint/35943/ https://epic.awi.de/id/eprint/35943/1/andrex_jgr_final_withfig.pdf https://doi.org/10.1002/2013JC009725 https://hdl.handle.net/10013/epic.43854 https://hdl.handle.net/10013/epic.43854.d001 |
genre |
Antarc* Antarctic Sea ice Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean Weddell Sea |
op_source |
EPIC3Journal of Geophysical Research: Oceans, Wiley, 119(6), pp. 3357-3377, ISSN: 2169-9291 |
op_relation |
https://epic.awi.de/id/eprint/35943/1/andrex_jgr_final_withfig.pdf https://hdl.handle.net/10013/epic.43854.d001 Jullion, L. , Naveira Garabato, A. C. , Bacon, S. , Meredith, M. P. , Brown, P. J. , Torres-Valdés, S. , Speer, K. G. , Holland, P. R. , Dong, J. , Bakker, D. , Hoppema, M. orcid:0000-0002-2326-619X , Loose, B. , Venables, H. J. , Jenkins, W. J. , Messias, M. J. and Fahrbach, E. (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 . doi:10.1002/2013JC009725 <https://doi.org/10.1002/2013JC009725> , hdl:10013/epic.43854 |
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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1810494589854810112 |