Oceanic hindcast simulations at high resolution suggest that the Atlantic MOC is bistable
All climate models predict a freshening of the North Atlantic at high latitude that may induce an abrupt change of the Atlantic Meridional Overturning Circulation (hereafter AMOC) if it resides in the bistable regime, where both a strong and a weak state coexist. The latter remains uncertain as ther...
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ftnerc:oai:nora.nerc.ac.uk:503000 2023-05-15T17:32:23+02:00 Oceanic hindcast simulations at high resolution suggest that the Atlantic MOC is bistable Deshayes, J. Tréguier, A.-M. Barnier, B. Lecointre, A. Sommer, J. Le Molines, J.-M. Penduff, T. Bourdallé-Badie, R. Drillet, Y. Garric, G. Benshila, R. Madec, G. Biastoch, A. Böning, C.W. Scheinert, M. Coward, A.C. Hirschi, J.J.-M. 2013-06-28 text http://nora.nerc.ac.uk/id/eprint/503000/ https://nora.nerc.ac.uk/id/eprint/503000/1/grl50534_Deshayes.pdf https://doi.org/10.1002/grl.50534 en eng https://nora.nerc.ac.uk/id/eprint/503000/1/grl50534_Deshayes.pdf Deshayes, J.; Tréguier, A.-M.; Barnier, B.; Lecointre, A.; Sommer, J. Le; Molines, J.-M.; Penduff, T.; Bourdallé-Badie, R.; Drillet, Y.; Garric, G.; Benshila, R.; Madec, G.; Biastoch, A.; Böning, C.W.; Scheinert, M.; Coward, A.C. orcid:0000-0002-9111-7700 Hirschi, J.J.-M. 2013 Oceanic hindcast simulations at high resolution suggest that the Atlantic MOC is bistable. Geophysical Research Letters, 40 (12). 3069-3073. https://doi.org/10.1002/grl.50534 <https://doi.org/10.1002/grl.50534> Publication - Article PeerReviewed 2013 ftnerc https://doi.org/10.1002/grl.50534 2023-02-04T19:37:34Z All climate models predict a freshening of the North Atlantic at high latitude that may induce an abrupt change of the Atlantic Meridional Overturning Circulation (hereafter AMOC) if it resides in the bistable regime, where both a strong and a weak state coexist. The latter remains uncertain as there is no consensus among observations and ocean reanalyses, where the AMOC is bistable, versus most climate models that reproduce a mono-stable strong AMOC. A series of four hindcast simulations of the global ocean at 1/12° resolution, which is presently unique, are used to diagnose freshwater transport by the AMOC in the South Atlantic, an indicator of AMOC bistability. In all simulations, the AMOC resides in the bistable regime: it exports freshwater southward in the South Atlantic, implying a positive salt advection feedback that would act to amplify a decreasing trend in subarctic deep water formation as projected in climate scenarios. Article in Journal/Newspaper North Atlantic Subarctic Natural Environment Research Council: NERC Open Research Archive Geophysical Research Letters 40 12 3069 3073 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
All climate models predict a freshening of the North Atlantic at high latitude that may induce an abrupt change of the Atlantic Meridional Overturning Circulation (hereafter AMOC) if it resides in the bistable regime, where both a strong and a weak state coexist. The latter remains uncertain as there is no consensus among observations and ocean reanalyses, where the AMOC is bistable, versus most climate models that reproduce a mono-stable strong AMOC. A series of four hindcast simulations of the global ocean at 1/12° resolution, which is presently unique, are used to diagnose freshwater transport by the AMOC in the South Atlantic, an indicator of AMOC bistability. In all simulations, the AMOC resides in the bistable regime: it exports freshwater southward in the South Atlantic, implying a positive salt advection feedback that would act to amplify a decreasing trend in subarctic deep water formation as projected in climate scenarios. |
format |
Article in Journal/Newspaper |
author |
Deshayes, J. Tréguier, A.-M. Barnier, B. Lecointre, A. Sommer, J. Le Molines, J.-M. Penduff, T. Bourdallé-Badie, R. Drillet, Y. Garric, G. Benshila, R. Madec, G. Biastoch, A. Böning, C.W. Scheinert, M. Coward, A.C. Hirschi, J.J.-M. |
spellingShingle |
Deshayes, J. Tréguier, A.-M. Barnier, B. Lecointre, A. Sommer, J. Le Molines, J.-M. Penduff, T. Bourdallé-Badie, R. Drillet, Y. Garric, G. Benshila, R. Madec, G. Biastoch, A. Böning, C.W. Scheinert, M. Coward, A.C. Hirschi, J.J.-M. Oceanic hindcast simulations at high resolution suggest that the Atlantic MOC is bistable |
author_facet |
Deshayes, J. Tréguier, A.-M. Barnier, B. Lecointre, A. Sommer, J. Le Molines, J.-M. Penduff, T. Bourdallé-Badie, R. Drillet, Y. Garric, G. Benshila, R. Madec, G. Biastoch, A. Böning, C.W. Scheinert, M. Coward, A.C. Hirschi, J.J.-M. |
author_sort |
Deshayes, J. |
title |
Oceanic hindcast simulations at high resolution suggest that the Atlantic MOC is bistable |
title_short |
Oceanic hindcast simulations at high resolution suggest that the Atlantic MOC is bistable |
title_full |
Oceanic hindcast simulations at high resolution suggest that the Atlantic MOC is bistable |
title_fullStr |
Oceanic hindcast simulations at high resolution suggest that the Atlantic MOC is bistable |
title_full_unstemmed |
Oceanic hindcast simulations at high resolution suggest that the Atlantic MOC is bistable |
title_sort |
oceanic hindcast simulations at high resolution suggest that the atlantic moc is bistable |
publishDate |
2013 |
url |
http://nora.nerc.ac.uk/id/eprint/503000/ https://nora.nerc.ac.uk/id/eprint/503000/1/grl50534_Deshayes.pdf https://doi.org/10.1002/grl.50534 |
genre |
North Atlantic Subarctic |
genre_facet |
North Atlantic Subarctic |
op_relation |
https://nora.nerc.ac.uk/id/eprint/503000/1/grl50534_Deshayes.pdf Deshayes, J.; Tréguier, A.-M.; Barnier, B.; Lecointre, A.; Sommer, J. Le; Molines, J.-M.; Penduff, T.; Bourdallé-Badie, R.; Drillet, Y.; Garric, G.; Benshila, R.; Madec, G.; Biastoch, A.; Böning, C.W.; Scheinert, M.; Coward, A.C. orcid:0000-0002-9111-7700 Hirschi, J.J.-M. 2013 Oceanic hindcast simulations at high resolution suggest that the Atlantic MOC is bistable. Geophysical Research Letters, 40 (12). 3069-3073. https://doi.org/10.1002/grl.50534 <https://doi.org/10.1002/grl.50534> |
op_doi |
https://doi.org/10.1002/grl.50534 |
container_title |
Geophysical Research Letters |
container_volume |
40 |
container_issue |
12 |
container_start_page |
3069 |
op_container_end_page |
3073 |
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1766130463462653952 |