Ferster B. S. auteur aut IRD Simon A. auteur aut IRD Fedorov A. auteur aut IRD Mignot Juliette auteur aut IRD Guilyardi E. auteur aut IRD text journalArticle eng text/pdf born digital access 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. specialized Arctic sea ice AMOC subpolar North Atlantic NAO ATLANTIQUE ARCTIQUE 021 020 062 49 16 e2022GL097967 [11 ] 2022 0094-8276 https://www.documentation.ird.fr/hor/fdi:010086025 10.1029/2022gl097967 0094-8276 [F B010086025] https://www.documentation.ird.fr/hor/fdi:010086025 https://www.documentation.ird.fr/intranet/publi/2022-10/010086025.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2022-10-07 2025-02-24 fdi:010086025 fre