@article{fdi:010070244,
  title = {{I}nterannual variability of zonal currents in the equatorial {I}ndian {O}cean : respective control of {IOD} and {ENSO}},
  author = {{S}achidanandan, {C}. and {L}engaigne, {M}atthieu and {M}uraleedharan, {P}. {M}. and {M}athew, {B}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he observational record is too short to confidently differentiate the relative contributions of {I}ndian {O}cean {D}ipole ({IOD}) and {E}l {N}io-{S}outhern {O}scillation ({ENSO}) on the interannual variability of the equatorial current system in the {I}ndian {O}cean because of the strong tendency of these two modes to co-occur. {I}n this study, we analyse a five-decade simulation from an ocean general circulation model forced to describe the main interannual variations of surface and subsurface equatorial zonal currents in the {I}ndian {O}cean. {T}his simulation is first shown to accurately capture the surface and subsurface zonal current variations in the equatorial region derived from the available observations. {T}hrough an {EOF} analysis on the model outputs, our results further reveals two main modes of equatorial current interannual variability: a dominant mode with largest amplitude in fall largely describing the variability of the fall {W}yrtki jet intensity followed a few months later by a secondary mode maximum in winter largely describing the interannual variability of the subsurface currents in that season. {O}ur analysis further confirms that the {IOD} is largely responsible for the interannual modulation of fall {W}yrtki jet intensity by modulating the equatorial wind intensity during that season. {T}he {IOD} is also responsible for strong subsurface current variations until {D}ecember, induced by the delayed effect of the {IOD} wind signal onto the equatorial thermocline tilt. {T}he equatorial current system response to {ENSO} is weaker and delayed compared to that of the {IOD}. {T}he remote and delayed impact of {ENSO} in the {IO} indeed induces equatorial wind variations in winter that modulate the winter surface current intensity and the spring equatorial undercurrent intensity through its delayed impact on the thermocline tilt.},
  keywords = {{E}quatorial undercurrent ; {E}quatorial jet ; {I}nterannual variability ; {E}quatorial {I}ndian {O}cean ; {I}ndian {O}cean {D}ipole ; {ENSO} ; {OCEAN} {INDIEN} ; {ZONE} {EQUATORIALE}},
  booktitle = {},
  journal = {{O}cean {D}ynamics},
  volume = {67},
  numero = {7},
  pages = {857--873},
  ISSN = {1616-7341},
  year = {2017},
  DOI = {10.1007/s10236-017-1061-4},
  URL = {https://www.documentation.ird.fr/hor/fdi:010070244},
}