Southern Ocean circulation and eddy compensation in CMIP5 models
Thirteen state-of-the-art climate models from phase 5 of the Coupled Model Intercomparison Project (CMIP5) are used to evaluate the response of the Antarctic Circumpolar Current (ACC) transport and Southern Ocean meridional overturning circulation to surface wind stress and buoyancy changes. Underst...
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ftunivtasecite:oai:ecite.utas.edu.au:103131 2023-05-15T14:03:25+02:00 Southern Ocean circulation and eddy compensation in CMIP5 models Downes, SM Hogg, AM 2013 https://doi.org/10.1175/JCLI-D-12-00504.1 http://ecite.utas.edu.au/103131 en eng Amer Meteorological Soc http://dx.doi.org/10.1175/JCLI-D-12-00504.1 Downes, SM and Hogg, AM, Southern Ocean circulation and eddy compensation in CMIP5 models, Journal of Climate, 26, (18) pp. 7198-7220. ISSN 0894-8755 (2013) [Refereed Article] http://ecite.utas.edu.au/103131 Earth Sciences Oceanography Physical Oceanography Refereed Article PeerReviewed 2013 ftunivtasecite https://doi.org/10.1175/JCLI-D-12-00504.1 2019-12-13T22:04:36Z Thirteen state-of-the-art climate models from phase 5 of the Coupled Model Intercomparison Project (CMIP5) are used to evaluate the response of the Antarctic Circumpolar Current (ACC) transport and Southern Ocean meridional overturning circulation to surface wind stress and buoyancy changes. Understanding how these flowsfundamental players in the global distribution of heat, gases, and nutrientsrespond to climate change is currently a widely debated issue among oceanographers. Here, the authors analyze the circulation responses of these coarse-resolution coupled models to surface fluxes. Under a future CMIP5 climate pathway where the equivalent atmospheric CO 2 reaches 1370 ppm by 2100, the models robustly project reduced Southern Ocean density in the upper 2000 m accompanied by strengthened stratification. Despite an overall increase in overlying wind stress (~20%), the projected ACC transports lie within 15% of their historical state, and no significant relationship with changes in the magnitude or position of the wind stress is identified. The models indicate that a weakening of ACC transport at the end of the twenty-first century is correlated with a strong increase in the surface heat and freshwater fluxes in the ACC region. In contrast, the surface heat gain across the ACC region and the wind-driven surface transports are significantly correlated with an increased upper and decreased lower Eulerian-mean meridional overturning circulation. The change in the eddy-induced overturning in both the depth and density spaces is quantified, and it is found that the CMIP5 models project partial eddy compensation of the upper and lower overturning cells. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean eCite UTAS (University of Tasmania) Antarctic Southern Ocean The Antarctic Journal of Climate 26 18 7198 7220 |
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Open Polar |
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eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Physical Oceanography |
spellingShingle |
Earth Sciences Oceanography Physical Oceanography Downes, SM Hogg, AM Southern Ocean circulation and eddy compensation in CMIP5 models |
topic_facet |
Earth Sciences Oceanography Physical Oceanography |
description |
Thirteen state-of-the-art climate models from phase 5 of the Coupled Model Intercomparison Project (CMIP5) are used to evaluate the response of the Antarctic Circumpolar Current (ACC) transport and Southern Ocean meridional overturning circulation to surface wind stress and buoyancy changes. Understanding how these flowsfundamental players in the global distribution of heat, gases, and nutrientsrespond to climate change is currently a widely debated issue among oceanographers. Here, the authors analyze the circulation responses of these coarse-resolution coupled models to surface fluxes. Under a future CMIP5 climate pathway where the equivalent atmospheric CO 2 reaches 1370 ppm by 2100, the models robustly project reduced Southern Ocean density in the upper 2000 m accompanied by strengthened stratification. Despite an overall increase in overlying wind stress (~20%), the projected ACC transports lie within 15% of their historical state, and no significant relationship with changes in the magnitude or position of the wind stress is identified. The models indicate that a weakening of ACC transport at the end of the twenty-first century is correlated with a strong increase in the surface heat and freshwater fluxes in the ACC region. In contrast, the surface heat gain across the ACC region and the wind-driven surface transports are significantly correlated with an increased upper and decreased lower Eulerian-mean meridional overturning circulation. The change in the eddy-induced overturning in both the depth and density spaces is quantified, and it is found that the CMIP5 models project partial eddy compensation of the upper and lower overturning cells. |
format |
Article in Journal/Newspaper |
author |
Downes, SM Hogg, AM |
author_facet |
Downes, SM Hogg, AM |
author_sort |
Downes, SM |
title |
Southern Ocean circulation and eddy compensation in CMIP5 models |
title_short |
Southern Ocean circulation and eddy compensation in CMIP5 models |
title_full |
Southern Ocean circulation and eddy compensation in CMIP5 models |
title_fullStr |
Southern Ocean circulation and eddy compensation in CMIP5 models |
title_full_unstemmed |
Southern Ocean circulation and eddy compensation in CMIP5 models |
title_sort |
southern ocean circulation and eddy compensation in cmip5 models |
publisher |
Amer Meteorological Soc |
publishDate |
2013 |
url |
https://doi.org/10.1175/JCLI-D-12-00504.1 http://ecite.utas.edu.au/103131 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
http://dx.doi.org/10.1175/JCLI-D-12-00504.1 Downes, SM and Hogg, AM, Southern Ocean circulation and eddy compensation in CMIP5 models, Journal of Climate, 26, (18) pp. 7198-7220. ISSN 0894-8755 (2013) [Refereed Article] http://ecite.utas.edu.au/103131 |
op_doi |
https://doi.org/10.1175/JCLI-D-12-00504.1 |
container_title |
Journal of Climate |
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26 |
container_issue |
18 |
container_start_page |
7198 |
op_container_end_page |
7220 |
_version_ |
1766274069809856512 |