Destabilization of glacial climate by the radiative impact of Atlantic Meridional overturning circulation disruptions
Unidad de excelencia María de Maeztu MdM-2015-0552 During each of the dramatic global warmings that ended the Pleistocene ice ages, the Atlantic Meridional Overturning Circulation (AMOC) was disrupted. It is not clear whether this was a contributing cause or simply an effect of deglaciation. Here we...
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ftuabarcelonapb:oai:ddd.uab.cat:187983 2023-05-15T16:40:54+02:00 Destabilization of glacial climate by the radiative impact of Atlantic Meridional overturning circulation disruptions Galbraith, Eric Merlis, Timothy M. Palter, Jaime B. 2016 application/pdf https://ddd.uab.cat/record/187983 eng eng Geophysical research letters Vol. 43 issue 15 (August 2016), p. 8214-8221 https://ddd.uab.cat/record/187983 urn:10.1002/2016GL069846 urn:oai:ddd.uab.cat:187983 urn:articleid:00948276v43n15p8214 urn:scopus_id:84981295728 urn:wos_id:000383290300050 urn:altmetric_id:10110020 urn:oai:egreta.uab.cat:publications/ef327394-42f7-4d39-b387-4095ddce1979 open access Tots els drets reservats. https://rightsstatements.org/vocab/InC/1.0/ Article 2016 ftuabarcelonapb 2023-02-06T21:13:48Z Unidad de excelencia María de Maeztu MdM-2015-0552 During each of the dramatic global warmings that ended the Pleistocene ice ages, the Atlantic Meridional Overturning Circulation (AMOC) was disrupted. It is not clear whether this was a contributing cause or simply an effect of deglaciation. Here we show that in an ensemble of simulations with a global climate model, AMOC disruption causes a consistent and sustained positive radiative imbalance of ~0.4Wm2. The imbalance is accommodated by heat accumulation in the ocean interior, representing an overall planetary warming, subsequently released by deep convection in the North Atlantic when the AMOC resumes. The results suggest a means by which AMOC disruptions could have helped to tip the planet out of stable glaciated states. However, the fact that AMOC disruptions occurred during prior Heinrich Stadials without causing deglaciation shows that other factors, such as ice sheet dynamics, or controls on CO2, were also key for deglaciation. Article in Journal/Newspaper Ice Sheet North Atlantic Universitat Autònoma de Barcelona: Dipòsit Digital de Documents de la UAB Geophysical Research Letters 43 15 8214 8221 |
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Open Polar |
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Universitat Autònoma de Barcelona: Dipòsit Digital de Documents de la UAB |
op_collection_id |
ftuabarcelonapb |
language |
English |
description |
Unidad de excelencia María de Maeztu MdM-2015-0552 During each of the dramatic global warmings that ended the Pleistocene ice ages, the Atlantic Meridional Overturning Circulation (AMOC) was disrupted. It is not clear whether this was a contributing cause or simply an effect of deglaciation. Here we show that in an ensemble of simulations with a global climate model, AMOC disruption causes a consistent and sustained positive radiative imbalance of ~0.4Wm2. The imbalance is accommodated by heat accumulation in the ocean interior, representing an overall planetary warming, subsequently released by deep convection in the North Atlantic when the AMOC resumes. The results suggest a means by which AMOC disruptions could have helped to tip the planet out of stable glaciated states. However, the fact that AMOC disruptions occurred during prior Heinrich Stadials without causing deglaciation shows that other factors, such as ice sheet dynamics, or controls on CO2, were also key for deglaciation. |
format |
Article in Journal/Newspaper |
author |
Galbraith, Eric Merlis, Timothy M. Palter, Jaime B. |
spellingShingle |
Galbraith, Eric Merlis, Timothy M. Palter, Jaime B. Destabilization of glacial climate by the radiative impact of Atlantic Meridional overturning circulation disruptions |
author_facet |
Galbraith, Eric Merlis, Timothy M. Palter, Jaime B. |
author_sort |
Galbraith, Eric |
title |
Destabilization of glacial climate by the radiative impact of Atlantic Meridional overturning circulation disruptions |
title_short |
Destabilization of glacial climate by the radiative impact of Atlantic Meridional overturning circulation disruptions |
title_full |
Destabilization of glacial climate by the radiative impact of Atlantic Meridional overturning circulation disruptions |
title_fullStr |
Destabilization of glacial climate by the radiative impact of Atlantic Meridional overturning circulation disruptions |
title_full_unstemmed |
Destabilization of glacial climate by the radiative impact of Atlantic Meridional overturning circulation disruptions |
title_sort |
destabilization of glacial climate by the radiative impact of atlantic meridional overturning circulation disruptions |
publishDate |
2016 |
url |
https://ddd.uab.cat/record/187983 |
genre |
Ice Sheet North Atlantic |
genre_facet |
Ice Sheet North Atlantic |
op_relation |
Geophysical research letters Vol. 43 issue 15 (August 2016), p. 8214-8221 https://ddd.uab.cat/record/187983 urn:10.1002/2016GL069846 urn:oai:ddd.uab.cat:187983 urn:articleid:00948276v43n15p8214 urn:scopus_id:84981295728 urn:wos_id:000383290300050 urn:altmetric_id:10110020 urn:oai:egreta.uab.cat:publications/ef327394-42f7-4d39-b387-4095ddce1979 |
op_rights |
open access Tots els drets reservats. https://rightsstatements.org/vocab/InC/1.0/ |
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Geophysical Research Letters |
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43 |
container_issue |
15 |
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8214 |
op_container_end_page |
8221 |
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1766031332553523200 |