@article{fdi:010058989,
  title = {{A} 20-year coupled ocean-sea ice-atmosphere variability mode in the {N}orth {A}tlantic in an {AOGCM}},
  author = {{E}scudier, {R}. and {M}ignot, {J}uliette and {S}wingedouw, {D}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n order to understand potential predictability of the ocean and climate at the decadal time scales, it is crucial to improve our understanding of internal variability at this time scale. {H}ere, we describe a 20-year mode of variability found in the {N}orth {A}tlantic in a 1,000-year pre-industrial simulation of the {IPSL}-{CM}5{A}-{LR} climate model. {T}his mode involves the propagation of near-surface temperature and salinity anomalies along the southern branch of the subpolar gyre, leading to anomalous sea-ice melting in the {N}ordic {S}eas, which then forces sea-level pressure anomalies through anomalous surface atmospheric temperatures. {T}he wind stress associated to this atmospheric structure influences the strength of the {E}ast {G}reenland {C}urrent across the {D}enmark {S}trait, which, in turn, induces near-surface temperature and salinity anomalies of opposite sign at the entrance of the {L}abrador {S}ea. {T}his starts the second half of the cycle after approximatively 10 years. {T}he time scale of the cycle is thus essentially set by advection of tracers along the southern branch of the subpolar gyre, and by the time needed for anomalous {E}ast {G}reenland {C}urrent to accumulate heat and freshwater anomalies at the entrance of the {L}abrador {S}ea. {T}he {A}tlantic meridional overturning circulation ({AMOC}) does not play a dominant role in the mode that is confined in the subpolar {N}orth {A}tlantic, but it also has a 20-year preferred timescale. {T}his is due to the influence of the propagating salinity anomalies on the oceanic deep convection. {T}he existence of this preferred timescale has important implications in terms of potential predictability of the {N}orth {A}tlantic climate in the model, although its realism remains questionable and is discussed.},
  keywords = {{D}ecadal climate variability ; {T}hermohaline circulation ; {O}cean-sea ice-atmosphere coupling ; {S}ubpolar {N}orth {A}tlantic ; {C}oupled climate model ; {ATLANTIQUE} {NORD}},
  booktitle = {},
  journal = {{C}limate {D}ynamics},
  volume = {40},
  numero = {3-4},
  pages = {619--636},
  ISSN = {0930-7575},
  year = {2013},
  DOI = {10.1007/s00382-012-1402-4},
  URL = {https://www.documentation.ird.fr/hor/fdi:010058989},
}