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...
Published in: | Geophysical Research Letters |
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American Geophysical Union
2022
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ftunivreading:oai:centaur.reading.ac.uk:107418 2024-06-23T07:48:43+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, Brady S. Simon, Amélie Fedorov, Alexey Mignot, Juliette Guilyardi, Eric 2022-08-28 https://centaur.reading.ac.uk/107418/ unknown American Geophysical Union Ferster, B. S. orcid:0000-0001-9241-518X , Simon, A. orcid:0000-0003-0177-9442 , Fedorov, A. orcid:0000-0001-5428-1117 , Mignot, J. orcid:0000-0002-4894-898X and Guilyardi, E. <https://centaur.reading.ac.uk/view/creators/90000869.html> orcid:0000-0002-2255-8625 (2022) Slowdown and recovery of the Atlantic meridional overturning circulation and a persistent North Atlantic warming hole induced by Arctic sea ice decline. Geophysical Research Letters, 49 (16). e2022GL097967. ISSN 0094-8276 doi: https://doi.org/10.1029/2022gl097967 <https://doi.org/10.1029/2022gl097967> Article PeerReviewed 2022 ftunivreading https://doi.org/10.1029/2022gl097967 2024-06-11T15:11:42Z 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 ∼2°C around 50°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. Article in Journal/Newspaper Arctic Arctic Iceland North Atlantic Sea ice CentAUR: Central Archive at the University of Reading Arctic Geophysical Research Letters 49 16 |
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Open Polar |
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CentAUR: Central Archive at the University of Reading |
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ftunivreading |
language |
unknown |
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 ∼2°C around 50°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 |
Article in Journal/Newspaper |
author |
Ferster, Brady S. Simon, Amélie Fedorov, Alexey Mignot, Juliette Guilyardi, Eric |
spellingShingle |
Ferster, Brady S. Simon, Amélie Fedorov, Alexey Mignot, Juliette Guilyardi, Eric Slowdown and recovery of the Atlantic meridional overturning circulation and a persistent North Atlantic warming hole induced by Arctic sea ice decline |
author_facet |
Ferster, Brady S. Simon, Amélie Fedorov, Alexey Mignot, Juliette Guilyardi, Eric |
author_sort |
Ferster, Brady 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 |
publisher |
American Geophysical Union |
publishDate |
2022 |
url |
https://centaur.reading.ac.uk/107418/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic Iceland North Atlantic Sea ice |
genre_facet |
Arctic Arctic Iceland North Atlantic Sea ice |
op_relation |
Ferster, B. S. orcid:0000-0001-9241-518X , Simon, A. orcid:0000-0003-0177-9442 , Fedorov, A. orcid:0000-0001-5428-1117 , Mignot, J. orcid:0000-0002-4894-898X and Guilyardi, E. <https://centaur.reading.ac.uk/view/creators/90000869.html> orcid:0000-0002-2255-8625 (2022) Slowdown and recovery of the Atlantic meridional overturning circulation and a persistent North Atlantic warming hole induced by Arctic sea ice decline. Geophysical Research Letters, 49 (16). e2022GL097967. ISSN 0094-8276 doi: https://doi.org/10.1029/2022gl097967 <https://doi.org/10.1029/2022gl097967> |
op_doi |
https://doi.org/10.1029/2022gl097967 |
container_title |
Geophysical Research Letters |
container_volume |
49 |
container_issue |
16 |
_version_ |
1802639042391572480 |