@article{fdi:010073687,
  title = {{I}ntrinsic precursors and timescale of the tropical {I}ndian {O}cean {D}ipole : insights from partially decoupled numerical experiment},
  author = {{C}retat, {J}. and {T}erray, {P}ascal and {M}asson, {S}. and {S}ooraj, {K}. {P}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he intrinsic precursors and timescale of the tropical {I}ndian {O}cean {D}ipole ({IOD}) are examined with the help of a partially coupled global experiment with decoupled {SST} over the tropical {P}acific. {T}he {IOD} does exist in the absence of sea surface temperature interannual variability in the tropical {P}acific in our modeling framework, but has weaker amplitude and damped {B}jerknes feedback. {H}owever, {IOD} variability is much more biennial in the absence than presence of {E}l {N}io {S}outhern {O}scillation, especially in the eastern equatorial {I}ndian {O}cean ({IO}). {S}uch biennial rhythm results mainly from two mechanisms internal to the {IO}. {T}he tropical ocean dynamics play a key role in the biennial anomalies during boreal winter with a sudden reversal of thermocline anomalies in the eastern equatorial {IO} forced by intraseasonal disturbances reminiscent of the {M}adden-{J}ulian {O}scillation ({MJO}). {H}owever, this preconditioning is not sufficient for triggering {IOD} events in the next boreal spring per se. {T}he main trigger for pure {IOD}s relates to tropical-extratropical interactions within the {IO}. {C}onvection and diabating heating associated with negative {IOD}s promote a {G}ill-type tropical response, excite mid-latitude wave-trains and subtropical blocking in the {S}outhern {H}emisphere that trigger positive subtropical {IOD} events during boreal winter. {T}he latter promotes cold {SST} and anticyclonic circulation anomalies over the southeast {IO} that persist and migrate northeastward, triggering positive {IOD} events during the next boreal spring. {A}ccounting for the complementary influence of tropical ocean dynamics coupled to {MJO} and tropical-extratropical ocean-atmosphere interactions may thus help improving {IOD} predictability.},
  keywords = {{B}iennial variability ; {C}oupled climate model ; {I}ndian {O}cean {D}ipole ; {MJO} ; {O}cean dynamics ; {T}ropical-extratropical interactions ; {OCEAN} {INDIEN} ; {ZONE} {TROPICALE}},
  booktitle = {},
  journal = {{C}limate {D}ynamics},
  volume = {51},
  numero = {4},
  pages = {1311--1332},
  ISSN = {0930-7575},
  year = {2018},
  DOI = {10.1007/s00382-017-3956-7},
  URL = {https://www.documentation.ird.fr/hor/fdi:010073687},
}