@article{fdi:010048222,
  title = {{G}lacial climate sensitivity to different states of the {A}tlantic {M}eridional overturning circulation : results from the {IPSL} model},
  author = {{K}ageyama, {M}. and {M}ignot, {J}uliette and {S}wingedouw, {D}. and {M}arzin, {C}. and {A}lkama, {R}. and {M}arti, {O}.},
  editor = {},
  language = {{ENG}},
  abstract = {{P}aleorecords from distant locations on the globe show rapid and large amplitude climate variations during the last glacial period. {H}ere we study the global climatic response to different states of the {A}tlantic {M}eridional {O}verturning {C}irculation ({AMOC}) as a potential explanation for these climate variations and their possible connections. {W}e analyse three glacial simulations obtained with an atmosphere-ocean coupled general circulation model and characterised by different {AMOC} strengths (18, 15 and 2 {S}v) resulting from successive similar to 0.1 {S}v freshwater perturbations in the {N}orth {A}tlantic. {T}hese {AMOC} states suggest the existence of a freshwater threshold for which the {AMOC} collapses. {A} weak (18 to 15 {S}v) {AMOC} decrease results in a {N}orth {A}tlantic and {E}uropean cooling. {T}his cooling is not homogeneous, with even a slight warming over the {N}orwegian {S}ea. {C}onvection in this area is active in both experiments, but surprisingly stronger in the 15 {S}v simulation, which appears to be related to interactions with the atmospheric circulation and sea-ice cover. {F}ar from the {N}orth {A}tlantic, the climatic response is not significant. {T}he climate differences for an {AMOC} collapse (15 to 2 {S}v) are much larger and of global extent. {T}he timing of the climate response to this {AMOC} collapse suggests teleconnection mechanisms. {O}ur analyses focus on the {N}orth {A}tlantic and surrounding regions, the tropical {A}tlantic and the {I}ndian monsoon region. {T}he {N}orth {A}tlantic cooling associated with the {AMOC} collapse induces a cyclonic atmospheric circulation anomaly centred over this region, which modulates the eastward advection of cold air over the {E}urasian continent. {T}his can explain why the cooling is not as strong over western {E}urope as over the {N}orth {A}tlantic. {I}n the {T}ropics, the southward shift of the {I}nter-{T}ropical {C}onvergence {Z}one appears to be strongest over the {A}tlantic and {E}astern {P}acific and results from an adjustment of the atmospheric and oceanic heat transports. {F}inally, the {I}ndian monsoon weakening appears to be connected to the {N}orth {A}tlantic cooling via that of the troposphere over {E}urasia. {S}uch an understanding of these teleconnections and their timing could be useful for paleodata interpretation.},
  keywords = {},
  booktitle = {},
  journal = {{C}limate of the {P}ast},
  volume = {5},
  numero = {3},
  pages = {551--570},
  ISSN = {1814-9324},
  year = {2009},
  URL = {https://www.documentation.ird.fr/hor/fdi:010048222},
}