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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ftreroch:oai:doc.rero.ch:322011 2023-05-15T17:32:25+02:00 Is the Atlantic subpolar gyre bistable in comprehensive coupled climate models? Born, Andreas Stocker, Thomas Raible, Christoph Levermann, Anders 2018-06-18T17:59:47Z http://doc.rero.ch/record/322011/files/382_2012_Article_1525.pdf eng eng http://doc.rero.ch/record/322011/files/382_2012_Article_1525.pdf 2018 ftreroch 2023-02-16T17:32:44Z 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 Other/Unknown Material North Atlantic RERO DOC Digital Library |
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Open Polar |
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RERO DOC Digital Library |
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ftreroch |
language |
English |
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 |
author |
Born, Andreas Stocker, Thomas Raible, Christoph Levermann, Anders |
spellingShingle |
Born, Andreas Stocker, Thomas Raible, Christoph Levermann, Anders Is the Atlantic subpolar gyre bistable in comprehensive coupled climate models? |
author_facet |
Born, Andreas Stocker, Thomas Raible, Christoph Levermann, Anders |
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? |
publishDate |
2018 |
url |
http://doc.rero.ch/record/322011/files/382_2012_Article_1525.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://doc.rero.ch/record/322011/files/382_2012_Article_1525.pdf |
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1766130534638944256 |