Slowdown and recovery of the atlantic meridional overturning circulation and a persistent North Atlantic warming hole induced by Arctic Sea ice decline
We investigate the impact of Arctic sea ice loss on the Atlantic meridional overturning circulation (AMOC) and North Atlantic climate in a coupled general circulation model (IPSL-CM5A2) perturbation experiment, wherein Arctic sea ice is reduced until reaching an equilibrium of an ice-free summer. Af...
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ftird:oai:ird.fr:fdi:010086025 2024-09-15T17:50:43+00:00 Slowdown and recovery of the atlantic meridional overturning circulation and a persistent North Atlantic warming hole induced by Arctic Sea ice decline Ferster, B. S. Simon, A. Fedorov, A. /Mignot, Juliette Guilyardi, E. ATLANTIQUE ARCTIQUE 2022 https://www.documentation.ird.fr/hor/fdi:010086025 EN eng https://www.documentation.ird.fr/hor/fdi:010086025 oai:ird.fr:fdi:010086025 Ferster B. S., Simon A., Fedorov A., Mignot Juliette, Guilyardi E. Slowdown and recovery of the atlantic meridional overturning circulation and a persistent North Atlantic warming hole induced by Arctic Sea ice decline. 2022, 49 (16), e2022GL097967 [11 p.] Arctic sea ice AMOC subpolar North Atlantic NAO text 2022 ftird 2024-08-15T05:57:40Z We investigate the impact of Arctic sea ice loss on the Atlantic meridional overturning circulation (AMOC) and North Atlantic climate in a coupled general circulation model (IPSL-CM5A2) perturbation experiment, wherein Arctic sea ice is reduced until reaching an equilibrium of an ice-free summer. After several decades we observe AMOC weakening caused by reduced dense water formation in the Iceland basin due to the warming of surface waters, and later compensated by intensification of dense water formation in the Western Subpolar North Atlantic. Consequently, AMOC slightly weakens in deep, dense waters but recovers through shallower, less dense waters overturning. In parallel, wind-driven intensification and southeastward expansion of the subpolar gyre cause a depth-extended cold anomaly similar to 2 degrees C around 50 degrees N that resembles the North Atlantic "warming hole." We conclude that compensating dense water formations drive AMOC changes following sea ice retreat and that a warming hole can develop independently of the AMOC modulation. Text Arctic Arctique* Iceland North Atlantic Sea ice IRD (Institute de recherche pour le développement): Horizon |
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Open Polar |
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IRD (Institute de recherche pour le développement): Horizon |
op_collection_id |
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language |
English |
topic |
Arctic sea ice AMOC subpolar North Atlantic NAO |
spellingShingle |
Arctic sea ice AMOC subpolar North Atlantic NAO Ferster, B. S. Simon, A. Fedorov, A. /Mignot, Juliette Guilyardi, E. Slowdown and recovery of the atlantic meridional overturning circulation and a persistent North Atlantic warming hole induced by Arctic Sea ice decline |
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Arctic sea ice AMOC subpolar North Atlantic NAO |
description |
We investigate the impact of Arctic sea ice loss on the Atlantic meridional overturning circulation (AMOC) and North Atlantic climate in a coupled general circulation model (IPSL-CM5A2) perturbation experiment, wherein Arctic sea ice is reduced until reaching an equilibrium of an ice-free summer. After several decades we observe AMOC weakening caused by reduced dense water formation in the Iceland basin due to the warming of surface waters, and later compensated by intensification of dense water formation in the Western Subpolar North Atlantic. Consequently, AMOC slightly weakens in deep, dense waters but recovers through shallower, less dense waters overturning. In parallel, wind-driven intensification and southeastward expansion of the subpolar gyre cause a depth-extended cold anomaly similar to 2 degrees C around 50 degrees N that resembles the North Atlantic "warming hole." We conclude that compensating dense water formations drive AMOC changes following sea ice retreat and that a warming hole can develop independently of the AMOC modulation. |
format |
Text |
author |
Ferster, B. S. Simon, A. Fedorov, A. /Mignot, Juliette Guilyardi, E. |
author_facet |
Ferster, B. S. Simon, A. Fedorov, A. /Mignot, Juliette Guilyardi, E. |
author_sort |
Ferster, B. S. |
title |
Slowdown and recovery of the atlantic meridional overturning circulation and a persistent North Atlantic warming hole induced by Arctic Sea ice decline |
title_short |
Slowdown and recovery of the atlantic meridional overturning circulation and a persistent North Atlantic warming hole induced by Arctic Sea ice decline |
title_full |
Slowdown and recovery of the atlantic meridional overturning circulation and a persistent North Atlantic warming hole induced by Arctic Sea ice decline |
title_fullStr |
Slowdown and recovery of the atlantic meridional overturning circulation and a persistent North Atlantic warming hole induced by Arctic Sea ice decline |
title_full_unstemmed |
Slowdown and recovery of the atlantic meridional overturning circulation and a persistent North Atlantic warming hole induced by Arctic Sea ice decline |
title_sort |
slowdown and recovery of the atlantic meridional overturning circulation and a persistent north atlantic warming hole induced by arctic sea ice decline |
publishDate |
2022 |
url |
https://www.documentation.ird.fr/hor/fdi:010086025 |
op_coverage |
ATLANTIQUE ARCTIQUE |
genre |
Arctic Arctique* Iceland North Atlantic Sea ice |
genre_facet |
Arctic Arctique* Iceland North Atlantic Sea ice |
op_relation |
https://www.documentation.ird.fr/hor/fdi:010086025 oai:ird.fr:fdi:010086025 Ferster B. S., Simon A., Fedorov A., Mignot Juliette, Guilyardi E. Slowdown and recovery of the atlantic meridional overturning circulation and a persistent North Atlantic warming hole induced by Arctic Sea ice decline. 2022, 49 (16), e2022GL097967 [11 p.] |
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