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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Online Access: | https://oceanrep.geomar.de/id/eprint/21557/ https://oceanrep.geomar.de/id/eprint/21557/1/grl50534.pdf https://doi.org/10.1002/grl.50534 |
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ftoceanrep:oai:oceanrep.geomar.de:21557 2023-05-15T17:32:21+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, Joan-Marc Penduff, T. Bourdallé-Badie, R. Drillet, Y. Garric, G. Benshila, R. Madec, G. Biastoch, Arne Böning, Claus W. Scheinert, Markus Coward, A. C. Hirschi, J. J.-M. 2013-06-28 text https://oceanrep.geomar.de/id/eprint/21557/ https://oceanrep.geomar.de/id/eprint/21557/1/grl50534.pdf https://doi.org/10.1002/grl.50534 en eng AGU (American Geophysical Union) Wiley https://oceanrep.geomar.de/id/eprint/21557/1/grl50534.pdf Deshayes, J., Tréguier, A. M., Barnier, B., Lecointre, A., Sommer, J. L., 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. and Hirschi, J. J. M. (2013) Oceanic hindcast simulations at high resolution suggest that the Atlantic MOC is bistable. Open Access Geophysical Research Letters, 40 (12). pp. 3069-3073. DOI 10.1002/grl.50534 <https://doi.org/10.1002/grl.50534>. doi:10.1002/grl.50534 info:eu-repo/semantics/openAccess Article PeerReviewed info:eu-repo/semantics/article 2013 ftoceanrep https://doi.org/10.1002/grl.50534 2023-04-07T15:09:49Z 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 OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Geophysical Research Letters 40 12 3069 3073 |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
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, Joan-Marc Penduff, T. Bourdallé-Badie, R. Drillet, Y. Garric, G. Benshila, R. Madec, G. Biastoch, Arne Böning, Claus W. Scheinert, Markus Coward, A. C. Hirschi, J. J.-M. |
spellingShingle |
Deshayes, J. Tréguier, A.-M. Barnier, B. Lecointre, A. Sommer, J. Le Molines, Joan-Marc Penduff, T. Bourdallé-Badie, R. Drillet, Y. Garric, G. Benshila, R. Madec, G. Biastoch, Arne Böning, Claus W. Scheinert, Markus 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, Joan-Marc Penduff, T. Bourdallé-Badie, R. Drillet, Y. Garric, G. Benshila, R. Madec, G. Biastoch, Arne Böning, Claus W. Scheinert, Markus 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 |
publisher |
AGU (American Geophysical Union) |
publishDate |
2013 |
url |
https://oceanrep.geomar.de/id/eprint/21557/ https://oceanrep.geomar.de/id/eprint/21557/1/grl50534.pdf https://doi.org/10.1002/grl.50534 |
genre |
North Atlantic Subarctic |
genre_facet |
North Atlantic Subarctic |
op_relation |
https://oceanrep.geomar.de/id/eprint/21557/1/grl50534.pdf Deshayes, J., Tréguier, A. M., Barnier, B., Lecointre, A., Sommer, J. L., 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. and Hirschi, J. J. M. (2013) Oceanic hindcast simulations at high resolution suggest that the Atlantic MOC is bistable. Open Access Geophysical Research Letters, 40 (12). pp. 3069-3073. DOI 10.1002/grl.50534 <https://doi.org/10.1002/grl.50534>. doi:10.1002/grl.50534 |
op_rights |
info:eu-repo/semantics/openAccess |
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 |
_version_ |
1766130420025393152 |