@article{fdi:010064739,
  title = {{D}o regions outside the tropical {P}acific influence {ENSO} through atmospheric teleconnections ?},
  author = {{D}ayan, {H}. and {I}zumo, {T}akeshi and {V}ialard, {J}{\'e}r{\^o}me and {L}engaigne, {M}atthieu and {M}asson, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}his paper aims at identifying oceanic regions outside the tropical {P}acific, which may influence the {E}l {N}ino {S}outhern {O}scillation ({ENSO}) through interannual modulation of equatorial {P}acific winds. {A}n {A}tmospheric {G}eneral {C}irculation {M}odel ({AGCM}) 7-members ensemble experiment forced by climatological sea surface temperature (hereafter, {SST}) in the tropical {P}acific {O}cean and observed interannually varying {SST} elsewhere produces ensemble-mean equatorial zonal wind stress interannual anomalies ({ZWSA}) over the equatorial {P}acific. {T}hese {ZWSA} are largest during boreal winter in the western {P}acific, and induce a similar to 0.5 degrees {C} response in the central {P}acific during the following spring in a simple ocean model, that weakly but significantly correlates with the following {ENSO} peak amplitude. {W}hen correlated with global {SST}, the residual western equatorial {P}acific {ZWSA} yield {SST} patterns that are reminiscent of {ENSO} teleconnections in the {I}ndian, {N}orth and {S}outh {P}acific, and {A}tlantic {O}ceans. {W}e further design 20-members ensemble sensitivity experiments forced by typical {SST} patterns of the main climate modes for each of these regions, in order to identify regions that influence equatorial {P}acific {ZWSA} most. {I}n our experiments, only the {I}ndian {O}cean {B}asin-wide {SST} warming in late boreal winter produces a statistically significant {ZWSA} in the western equatorial {P}acific, resulting in a weak but significant similar to 0.35 degrees {C} {SST} response in the central {P}acific (i.e. similar to 35 % of the observed standard deviation) during the following spring, the season when the {B}jerkness coupled feedback is particularly efficient. {T}his paper hence agrees with previous studies, which suggest that {ENSO}-induced basin-wide {SST} signals in the {I}ndian {O}cean may contribute to the phase transition of {ENSO}. {O}ur results suggest that studies exploring external influences on {ENSO} should adopt a global approach rather than focus on a specific region. {D}esigning coupled model simulations would also allow investigating air-sea interactions-mediated teleconnection mechanisms, which we can't reproduce in our forced {AGCM} framework.},
  keywords = {{E}l {N}ino {S}outhern {O}scillation ; {E}xternal forcing ; {A}tmospheric ; teleconnections ; {I}ndian {O}cean ; {OCEAN} {INDIEN} ; {PACIFIQUE}},
  booktitle = {},
  journal = {{C}limate {D}ynamics},
  volume = {45},
  numero = {3-4},
  pages = {583--601},
  ISSN = {0930-7575},
  year = {2015},
  DOI = {10.1007/s00382-014-2254-x},
  URL = {https://www.documentation.ird.fr/hor/fdi:010064739},
}