Is the Atlantic subpolar gyre bistable in comprehensive coupled climate models?
The Atlantic subpolar gyre (SPG) is one of the main drivers of decadal climate variability in the North Atlantic. Here we analyze its dynamics in pre-industrial control simulations of 19 different comprehensive coupled climate models. The analysis is based on a recently proposed description of the S...
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ftunivbern:oai:boris.unibe.ch:47700 2023-08-20T04:08:21+02:00 Is the Atlantic subpolar gyre bistable in comprehensive coupled climate models? Born, Andreas Stocker, Thomas Raible, Christoph Levermann, A. 2013 application/pdf https://boris.unibe.ch/47700/1/atlantic%20subpolar.pdf https://boris.unibe.ch/47700/ eng eng Springer-Verlag https://boris.unibe.ch/47700/ info:eu-repo/semantics/openAccess Born, Andreas; Stocker, Thomas; Raible, Christoph; Levermann, A. (2013). Is the Atlantic subpolar gyre bistable in comprehensive coupled climate models? Climate dynamics, 40(11-12), pp. 2993-3007. Springer-Verlag 10.1007/s00382-012-1525-7 <http://dx.doi.org/10.1007/s00382-012-1525-7> 530 Physics 550 Earth sciences & geology info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2013 ftunivbern https://doi.org/10.1007/s00382-012-1525-7 2023-07-31T21:05:56Z The Atlantic subpolar gyre (SPG) is one of the main drivers of decadal climate variability in the North Atlantic. Here we analyze its dynamics in pre-industrial control simulations of 19 different comprehensive coupled climate models. The analysis is based on a recently proposed description of the SPG dynamics that found the circulation to be potentially bistable due to a positive feedback mechanism including salt transport and enhanced deep convection in the SPG center. We employ a statistical method to identify multiple equilibria in time series that are subject to strong noise and analyze composite fields to assess whether the bistability results from the hypothesized feedback mechanism. Because noise dominates the time series in most models, multiple circulation modes can unambiguously be detected in only six models. Four of these six models confirm that the intensification is caused by the positive feedback mechanism. Article in Journal/Newspaper North Atlantic BORIS (Bern Open Repository and Information System, University of Bern) Climate Dynamics 40 11-12 2993 3007 |
institution |
Open Polar |
collection |
BORIS (Bern Open Repository and Information System, University of Bern) |
op_collection_id |
ftunivbern |
language |
English |
topic |
530 Physics 550 Earth sciences & geology |
spellingShingle |
530 Physics 550 Earth sciences & geology Born, Andreas Stocker, Thomas Raible, Christoph Levermann, A. Is the Atlantic subpolar gyre bistable in comprehensive coupled climate models? |
topic_facet |
530 Physics 550 Earth sciences & geology |
description |
The Atlantic subpolar gyre (SPG) is one of the main drivers of decadal climate variability in the North Atlantic. Here we analyze its dynamics in pre-industrial control simulations of 19 different comprehensive coupled climate models. The analysis is based on a recently proposed description of the SPG dynamics that found the circulation to be potentially bistable due to a positive feedback mechanism including salt transport and enhanced deep convection in the SPG center. We employ a statistical method to identify multiple equilibria in time series that are subject to strong noise and analyze composite fields to assess whether the bistability results from the hypothesized feedback mechanism. Because noise dominates the time series in most models, multiple circulation modes can unambiguously be detected in only six models. Four of these six models confirm that the intensification is caused by the positive feedback mechanism. |
format |
Article in Journal/Newspaper |
author |
Born, Andreas Stocker, Thomas Raible, Christoph Levermann, A. |
author_facet |
Born, Andreas Stocker, Thomas Raible, Christoph Levermann, A. |
author_sort |
Born, Andreas |
title |
Is the Atlantic subpolar gyre bistable in comprehensive coupled climate models? |
title_short |
Is the Atlantic subpolar gyre bistable in comprehensive coupled climate models? |
title_full |
Is the Atlantic subpolar gyre bistable in comprehensive coupled climate models? |
title_fullStr |
Is the Atlantic subpolar gyre bistable in comprehensive coupled climate models? |
title_full_unstemmed |
Is the Atlantic subpolar gyre bistable in comprehensive coupled climate models? |
title_sort |
is the atlantic subpolar gyre bistable in comprehensive coupled climate models? |
publisher |
Springer-Verlag |
publishDate |
2013 |
url |
https://boris.unibe.ch/47700/1/atlantic%20subpolar.pdf https://boris.unibe.ch/47700/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Born, Andreas; Stocker, Thomas; Raible, Christoph; Levermann, A. (2013). Is the Atlantic subpolar gyre bistable in comprehensive coupled climate models? Climate dynamics, 40(11-12), pp. 2993-3007. Springer-Verlag 10.1007/s00382-012-1525-7 <http://dx.doi.org/10.1007/s00382-012-1525-7> |
op_relation |
https://boris.unibe.ch/47700/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1007/s00382-012-1525-7 |
container_title |
Climate Dynamics |
container_volume |
40 |
container_issue |
11-12 |
container_start_page |
2993 |
op_container_end_page |
3007 |
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1774720550315229184 |