An assessment of Antarctic Circumpolar Current and Southern Ocean meridional overturning circulation during 1958-2007 in a suite of interannual CORE-II simulations
In the framework of the second phase of the Coordinated Ocean-ice Reference Experiments (CORE-II), we present an analysis of the representation of the Antarctic Circumpolar Current (ACC) and Southern Ocean meridional overturning circulation (MOC) in a suite of seventeen global oceansea ice models. W...
Published in: | Ocean Modelling |
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Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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Elsevier Sci Ltd
2015
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Online Access: | https://doi.org/10.1016/j.ocemod.2015.07.009 http://ecite.utas.edu.au/103136 |
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ftunivtasecite:oai:ecite.utas.edu.au:103136 |
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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 Farneti, R Downes, SM Griffies, SM Marsland, SJ Behrens, E Bentsen, M Bi, D Biastoch, A Boning, C Bozec, A Canuto, VM Chassignet, E Danabasoglu, G Danilov, S Diansky, N Drange, H Fogli, PG Gusev, A Hallberg, RW Howard, A Ilicak, M Jung, T Kelley, M Large, WG Leboissetier, A Long, M Lu, J Masina, S Mishra, A Navarra, A Nurser, AJG Patara, L Samuels, BL Sidorenko, D Tsujino, H Uotila, P Wang, Q Yeager, SG An assessment of Antarctic Circumpolar Current and Southern Ocean meridional overturning circulation during 1958-2007 in a suite of interannual CORE-II simulations |
topic_facet |
Earth Sciences Oceanography Physical Oceanography |
description |
In the framework of the second phase of the Coordinated Ocean-ice Reference Experiments (CORE-II), we present an analysis of the representation of the Antarctic Circumpolar Current (ACC) and Southern Ocean meridional overturning circulation (MOC) in a suite of seventeen global oceansea ice models. We focus on the mean, variability and trends of both the ACC and MOC over the 19582007 period, and discuss their relationship with the surface forcing. We aim to quantify the degree of eddy saturation and eddy compensation in the models participating in CORE-II, and compare our results with available observations, previous fine-resolution numerical studies and theoretical constraints. Most models show weak ACC transport sensitivity to changes in forcing during the past five decades, and they can be considered to be in an eddy saturated regime. Larger contrasts arise when considering MOC trends, with a majority of models exhibiting significant strengthening of the MOC during the late 20th and early 21st century. Only a few models show a relatively small sensitivity to forcing changes, responding with an intensified eddy-induced circulation that provides some degree of eddy compensation, while still showing considerable decadal trends. Both ACC and MOC interannual variabilities are largely controlled by the Southern Annular Mode (SAM). Based on these results, models are clustered into two groups. Models with constant or two-dimensional (horizontal) specification of the eddy-induced advection coefficient κ show larger ocean interior decadal trends, larger ACC transport decadal trends and no eddy compensation in the MOC. Eddy-permitting models or models with a three-dimensional time varying κ show smaller changes in isopycnal slopes and associated ACC trends, and partial eddy compensation. As previously argued, a constant in time or space κ is responsible for a poor representation of mesoscale eddy effects and cannot properly simulate the sensitivity of the ACC and MOC to changing surface forcing. Evidence is given for a larger sensitivity of the MOC as compared to the ACC transport, even when approaching eddy saturation. Future process studies designed for disentangling the role of momentum and buoyancy forcing in driving the ACC and MOC are proposed. |
format |
Article in Journal/Newspaper |
author |
Farneti, R Downes, SM Griffies, SM Marsland, SJ Behrens, E Bentsen, M Bi, D Biastoch, A Boning, C Bozec, A Canuto, VM Chassignet, E Danabasoglu, G Danilov, S Diansky, N Drange, H Fogli, PG Gusev, A Hallberg, RW Howard, A Ilicak, M Jung, T Kelley, M Large, WG Leboissetier, A Long, M Lu, J Masina, S Mishra, A Navarra, A Nurser, AJG Patara, L Samuels, BL Sidorenko, D Tsujino, H Uotila, P Wang, Q Yeager, SG |
author_facet |
Farneti, R Downes, SM Griffies, SM Marsland, SJ Behrens, E Bentsen, M Bi, D Biastoch, A Boning, C Bozec, A Canuto, VM Chassignet, E Danabasoglu, G Danilov, S Diansky, N Drange, H Fogli, PG Gusev, A Hallberg, RW Howard, A Ilicak, M Jung, T Kelley, M Large, WG Leboissetier, A Long, M Lu, J Masina, S Mishra, A Navarra, A Nurser, AJG Patara, L Samuels, BL Sidorenko, D Tsujino, H Uotila, P Wang, Q Yeager, SG |
author_sort |
Farneti, R |
title |
An assessment of Antarctic Circumpolar Current and Southern Ocean meridional overturning circulation during 1958-2007 in a suite of interannual CORE-II simulations |
title_short |
An assessment of Antarctic Circumpolar Current and Southern Ocean meridional overturning circulation during 1958-2007 in a suite of interannual CORE-II simulations |
title_full |
An assessment of Antarctic Circumpolar Current and Southern Ocean meridional overturning circulation during 1958-2007 in a suite of interannual CORE-II simulations |
title_fullStr |
An assessment of Antarctic Circumpolar Current and Southern Ocean meridional overturning circulation during 1958-2007 in a suite of interannual CORE-II simulations |
title_full_unstemmed |
An assessment of Antarctic Circumpolar Current and Southern Ocean meridional overturning circulation during 1958-2007 in a suite of interannual CORE-II simulations |
title_sort |
assessment of antarctic circumpolar current and southern ocean meridional overturning circulation during 1958-2007 in a suite of interannual core-ii simulations |
publisher |
Elsevier Sci Ltd |
publishDate |
2015 |
url |
https://doi.org/10.1016/j.ocemod.2015.07.009 http://ecite.utas.edu.au/103136 |
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/10.1016/j.ocemod.2015.07.009 Farneti, R and Downes, SM and Griffies, SM and Marsland, SJ and Behrens, E and Bentsen, M and Bi, D and Biastoch, A and Boning, C and Bozec, A and Canuto, VM and Chassignet, E and Danabasoglu, G and Danilov, S and Diansky, N and Drange, H and Fogli, PG and Gusev, A and Hallberg, RW and Howard, A and Ilicak, M and Jung, T and Kelley, M and Large, WG and Leboissetier, A and Long, M and Lu, J and Masina, S and Mishra, A and Navarra, A and Nurser, AJG and Patara, L and Samuels, BL and Sidorenko, D and Tsujino, H and Uotila, P and Wang, Q and Yeager, SG, An assessment of Antarctic Circumpolar Current and Southern Ocean meridional overturning circulation during 1958-2007 in a suite of interannual CORE-II simulations, Ocean Modelling, 93 pp. 84-120. ISSN 1463-5003 (2015) [Refereed Article] http://ecite.utas.edu.au/103136 |
op_doi |
https://doi.org/10.1016/j.ocemod.2015.07.009 |
container_title |
Ocean Modelling |
container_volume |
93 |
container_start_page |
84 |
op_container_end_page |
120 |
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1766274069980774400 |
spelling |
ftunivtasecite:oai:ecite.utas.edu.au:103136 2023-05-15T14:03:25+02:00 An assessment of Antarctic Circumpolar Current and Southern Ocean meridional overturning circulation during 1958-2007 in a suite of interannual CORE-II simulations Farneti, R Downes, SM Griffies, SM Marsland, SJ Behrens, E Bentsen, M Bi, D Biastoch, A Boning, C Bozec, A Canuto, VM Chassignet, E Danabasoglu, G Danilov, S Diansky, N Drange, H Fogli, PG Gusev, A Hallberg, RW Howard, A Ilicak, M Jung, T Kelley, M Large, WG Leboissetier, A Long, M Lu, J Masina, S Mishra, A Navarra, A Nurser, AJG Patara, L Samuels, BL Sidorenko, D Tsujino, H Uotila, P Wang, Q Yeager, SG 2015 https://doi.org/10.1016/j.ocemod.2015.07.009 http://ecite.utas.edu.au/103136 en eng Elsevier Sci Ltd http://dx.doi.org/10.1016/j.ocemod.2015.07.009 Farneti, R and Downes, SM and Griffies, SM and Marsland, SJ and Behrens, E and Bentsen, M and Bi, D and Biastoch, A and Boning, C and Bozec, A and Canuto, VM and Chassignet, E and Danabasoglu, G and Danilov, S and Diansky, N and Drange, H and Fogli, PG and Gusev, A and Hallberg, RW and Howard, A and Ilicak, M and Jung, T and Kelley, M and Large, WG and Leboissetier, A and Long, M and Lu, J and Masina, S and Mishra, A and Navarra, A and Nurser, AJG and Patara, L and Samuels, BL and Sidorenko, D and Tsujino, H and Uotila, P and Wang, Q and Yeager, SG, An assessment of Antarctic Circumpolar Current and Southern Ocean meridional overturning circulation during 1958-2007 in a suite of interannual CORE-II simulations, Ocean Modelling, 93 pp. 84-120. ISSN 1463-5003 (2015) [Refereed Article] http://ecite.utas.edu.au/103136 Earth Sciences Oceanography Physical Oceanography Refereed Article PeerReviewed 2015 ftunivtasecite https://doi.org/10.1016/j.ocemod.2015.07.009 2019-12-13T22:04:36Z In the framework of the second phase of the Coordinated Ocean-ice Reference Experiments (CORE-II), we present an analysis of the representation of the Antarctic Circumpolar Current (ACC) and Southern Ocean meridional overturning circulation (MOC) in a suite of seventeen global oceansea ice models. We focus on the mean, variability and trends of both the ACC and MOC over the 19582007 period, and discuss their relationship with the surface forcing. We aim to quantify the degree of eddy saturation and eddy compensation in the models participating in CORE-II, and compare our results with available observations, previous fine-resolution numerical studies and theoretical constraints. Most models show weak ACC transport sensitivity to changes in forcing during the past five decades, and they can be considered to be in an eddy saturated regime. Larger contrasts arise when considering MOC trends, with a majority of models exhibiting significant strengthening of the MOC during the late 20th and early 21st century. Only a few models show a relatively small sensitivity to forcing changes, responding with an intensified eddy-induced circulation that provides some degree of eddy compensation, while still showing considerable decadal trends. Both ACC and MOC interannual variabilities are largely controlled by the Southern Annular Mode (SAM). Based on these results, models are clustered into two groups. Models with constant or two-dimensional (horizontal) specification of the eddy-induced advection coefficient κ show larger ocean interior decadal trends, larger ACC transport decadal trends and no eddy compensation in the MOC. Eddy-permitting models or models with a three-dimensional time varying κ show smaller changes in isopycnal slopes and associated ACC trends, and partial eddy compensation. As previously argued, a constant in time or space κ is responsible for a poor representation of mesoscale eddy effects and cannot properly simulate the sensitivity of the ACC and MOC to changing surface forcing. Evidence is given for a larger sensitivity of the MOC as compared to the ACC transport, even when approaching eddy saturation. Future process studies designed for disentangling the role of momentum and buoyancy forcing in driving the ACC and MOC are proposed. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean eCite UTAS (University of Tasmania) Antarctic Southern Ocean The Antarctic Ocean Modelling 93 84 120 |