Born A. auteur aut IRD Mignot Juliette auteur aut IRD text journalArticle eng text/pdf born digital access Internal variability of the Atlantic subpolar gyre is investigated in a 600 years control simulation of a comprehensive coupled climate model. The subpolar gyre shows irregular oscillations of decadal time scale with most spectral power between 15 and 20 years. Positive and negative feedback mechanisms act successively on the circulation leading to an internal oscillation. This involves periodically enhanced deep convection in the subpolar gyre center and intermittently enhanced air-sea thermal coupling. As a result, anomalies of the large-scale atmospheric circulation can be transferred to the ocean on the ocean's intrinsic time scale, exciting the oscillator stochastically. A detailed understanding of oscillatory mechanisms of the ocean and their sensitivity to atmospheric forcing holds considerable potential for decadal predictions as well as for the interpretation of proxy data records. specialized Ocean circulation North Atlantic Subpolar gyre Decadal variability 021 032 39 1-2 461-474 2012 0930-7575 https://www.documentation.ird.fr/hor/fdi:010055996 10.1007/s00382-011-1180-4 0930-7575 [F B010055996] https://www.documentation.ird.fr/hor/fdi:010055996 https://www.documentation.ird.fr/intranet/publi/2012/07/010055996.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2012-07-24 2017-08-23 fdi:010055996 fre