The energetics of Southern Ocean upwelling
The oceans meridional overturning circulation is closed by the upwelling of dense, carbon-rich waters to the surface of the Southern Ocean. It has been proposed that upwelling in this region is driven by strong westerly winds, implying that the intensification of Southern Ocean winds in recent decad...
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ftunivtasecite:oai:ecite.utas.edu.au:114137 2023-05-15T18:23:42+02:00 The energetics of Southern Ocean upwelling Hogg, AM Spence, P Saenko, OA Downes, SM 2017 https://doi.org/10.1175/JPO-D-16-0176.1 http://ecite.utas.edu.au/114137 en eng Amer Meteorological Soc http://dx.doi.org/10.1175/JPO-D-16-0176.1 Hogg, AM and Spence, P and Saenko, OA and Downes, SM, The energetics of Southern Ocean upwelling, Journal of Physical Oceanography, 47, (1) pp. 135-153. ISSN 0022-3670 (2017) [Refereed Article] http://ecite.utas.edu.au/114137 Earth Sciences Oceanography Physical Oceanography Refereed Article PeerReviewed 2017 ftunivtasecite https://doi.org/10.1175/JPO-D-16-0176.1 2019-12-13T22:14:04Z The oceans meridional overturning circulation is closed by the upwelling of dense, carbon-rich waters to the surface of the Southern Ocean. It has been proposed that upwelling in this region is driven by strong westerly winds, implying that the intensification of Southern Ocean winds in recent decades may have enhanced the rate of upwelling, potentially affecting the global overturning circulation. However, there is no consensus on the sensitivity of upwelling to winds or on the nature of the connection between Southern Ocean processes and the global overturning circulation. In this study, the sensitivity of the overturning circulation to changes in Southern Ocean westerly wind stress is investigated using an eddy-permitting oceansea ice model. In addition to a suite of standard circulation metrics, an energy analysis is used to aid dynamical interpretation of the model response. Increased Southern Ocean wind stress enhances the upper cell of the overturning circulation through creation of available potential energy in the Southern Hemisphere, associated with stronger upwelling of deep water. Poleward shifts in the Southern Ocean westerlies lead to a complicated transient response, with the formation of bottom water induced by increased polynya activity in the Weddell Sea and a weakening of the upper overturning cell in the Northern Hemisphere. The energetic consequences of the upper overturning cell response indicate an interhemispheric connection to the input of available potential energy in the Northern Hemisphere. Article in Journal/Newspaper Southern Ocean Weddell Sea eCite UTAS (University of Tasmania) Southern Ocean Weddell Weddell Sea Journal of Physical Oceanography 47 1 135 153 |
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eCite UTAS (University of Tasmania) |
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ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Physical Oceanography |
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Earth Sciences Oceanography Physical Oceanography Hogg, AM Spence, P Saenko, OA Downes, SM The energetics of Southern Ocean upwelling |
topic_facet |
Earth Sciences Oceanography Physical Oceanography |
description |
The oceans meridional overturning circulation is closed by the upwelling of dense, carbon-rich waters to the surface of the Southern Ocean. It has been proposed that upwelling in this region is driven by strong westerly winds, implying that the intensification of Southern Ocean winds in recent decades may have enhanced the rate of upwelling, potentially affecting the global overturning circulation. However, there is no consensus on the sensitivity of upwelling to winds or on the nature of the connection between Southern Ocean processes and the global overturning circulation. In this study, the sensitivity of the overturning circulation to changes in Southern Ocean westerly wind stress is investigated using an eddy-permitting oceansea ice model. In addition to a suite of standard circulation metrics, an energy analysis is used to aid dynamical interpretation of the model response. Increased Southern Ocean wind stress enhances the upper cell of the overturning circulation through creation of available potential energy in the Southern Hemisphere, associated with stronger upwelling of deep water. Poleward shifts in the Southern Ocean westerlies lead to a complicated transient response, with the formation of bottom water induced by increased polynya activity in the Weddell Sea and a weakening of the upper overturning cell in the Northern Hemisphere. The energetic consequences of the upper overturning cell response indicate an interhemispheric connection to the input of available potential energy in the Northern Hemisphere. |
format |
Article in Journal/Newspaper |
author |
Hogg, AM Spence, P Saenko, OA Downes, SM |
author_facet |
Hogg, AM Spence, P Saenko, OA Downes, SM |
author_sort |
Hogg, AM |
title |
The energetics of Southern Ocean upwelling |
title_short |
The energetics of Southern Ocean upwelling |
title_full |
The energetics of Southern Ocean upwelling |
title_fullStr |
The energetics of Southern Ocean upwelling |
title_full_unstemmed |
The energetics of Southern Ocean upwelling |
title_sort |
energetics of southern ocean upwelling |
publisher |
Amer Meteorological Soc |
publishDate |
2017 |
url |
https://doi.org/10.1175/JPO-D-16-0176.1 http://ecite.utas.edu.au/114137 |
geographic |
Southern Ocean Weddell Weddell Sea |
geographic_facet |
Southern Ocean Weddell Weddell Sea |
genre |
Southern Ocean Weddell Sea |
genre_facet |
Southern Ocean Weddell Sea |
op_relation |
http://dx.doi.org/10.1175/JPO-D-16-0176.1 Hogg, AM and Spence, P and Saenko, OA and Downes, SM, The energetics of Southern Ocean upwelling, Journal of Physical Oceanography, 47, (1) pp. 135-153. ISSN 0022-3670 (2017) [Refereed Article] http://ecite.utas.edu.au/114137 |
op_doi |
https://doi.org/10.1175/JPO-D-16-0176.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
47 |
container_issue |
1 |
container_start_page |
135 |
op_container_end_page |
153 |
_version_ |
1766203773085024256 |