@article{fdi:010063926,
  title = {{H}eat budget in the {N}orth {A}tlantic subpolar gyre : impacts of atmospheric weather regimes on the 1995 warming event},
  author = {{B}arrier, {N}. and {D}eshayes, {J}ulie and {T}reguier, {A}. {M}. and {C}assou, {C}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n the mid 1990s, the {N}orth {A}tlantic subpolar gyre has shown a dramatic warming event that has been thoroughly investigated from observations and numerical simulations. {S}ome studies suggest that it was due to an interannual, wind-driven weakening and shrinking of the gyre that facilitated the penetration of warm {A}tlantic {W}ater, the weakening of the gyre being attributed to changes in the {N}orth {A}tlantic {O}scillation ({NAO}) and in the {E}ast {A}tlantic {P}attern, which are the two dominant modes of atmospheric variability in the {N}orth {A}tlantic. {H}owever, other studies suggest that the warming event was due to a decadal, buoyancy-driven strengthening of the meridional overturning circulation and subsequent intensification of the poleward heat transport, in response to the positive {NAO} conditions of 1988-1995. {T}o reconcile this discrepancy, the heat budget in the {N}orth {A}tlantic subpolar gyre is reconstructed from four ocean hindcast simulations sharing the same modelling platform but using different settings. {T}he novelty of this work is the decomposition of the subpolar gyre into a western and an eastern subregion, which is motivated by water mass distribution around {R}eykjanes {R}idge and by the fact that deep convection only occurs in the western subpolar gyre. {I}n the western subpolar gyre, the 1995 warming event is the decadal, baroclinic ocean response to positive {NAO} conditions from 1988 to 1995. {T}he latter induced increased surface heat loss in the {L}abrador {S}ea that intensified deep convection hence strengthened the meridional overturning circulation and the associated poleward heat transport. {I}n the eastern subregion, a concomittant warming is induced by an interannual, barotropic adjustment of the gyre circulation to an abrupt switch from positive {NAO} conditions in winter 1995 to negative {NAO} conditions in winter 1996. {I}ndeed, the gyre response to negative {NAO} conditions is a cyclonic intergyre-gyre that increases northward volume and heat transports at the southeastern limit of the subpolar gyre. {T}herefore, the discrepancies found in the literature about the 1995 warming event of the {N}orth {A}tlantic subpolar gyre are reconciled in the present work, which suggests that the atmospheric drivers, the mechanisms at stake and the associated timescales are different to the east and to the west of {R}eykjanes {R}idge.},
  keywords = {{ATLANTIQUE} {NORD}},
  booktitle = {},
  journal = {{P}rogress in {O}ceanography},
  volume = {130},
  numero = {},
  pages = {75--90},
  ISSN = {0079-6611},
  year = {2015},
  DOI = {10.1016/j.pocean.2014.10.001},
  URL = {https://www.documentation.ird.fr/hor/fdi:010063926},
}