@article{fdi:010055786,
  title = {{M}echanisms controlling warm water volume interannual variations in the equatorial {P}acific : diabatic versus adiabatic processes},
  author = {{L}engaigne, {M}atthieu and {H}ausmann, {U}. and {M}adec, {G}. and {M}enk{\`e}s, {C}hristophe and {V}ialard, {J}{\'e}r{\^o}me and {M}olines, {J}. {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{V}ariations of the volume of warm water above the thermocline in the equatorial {P}acific are a good predictor of {ENSO} ({E}l {N}ino/{S}outhern {O}scillation) and are thought to be critical for its preconditioning and development. {I}n this study, the {W}arm {W}ater {V}olume ({WWV}) interannual variability is analysed using forced general circulation model experiments and an original method for diagnosing processes responsible for {WWV} variations. {T}he meridional recharge/discharge to higher latitudes drives 60% of the {ENSO}-related equatorial {WWV} variations, while diabatic processes in the eastern equatorial {P}acific account for the remaining 40%. {I}nterior meridional transport is partially compensated by western boundary transports, especially in the southern hemisphere. {D}iabatic equatorial {WWV} formation (depletions) during {L}a {N}ina ({E}l {N}ino) are explained by enhanced (reduced) diathermal transport through enhanced (reduced) vertical mixing and penetrating solar forcing at the 20 degrees {C} isotherm depth. {T}he respective contribution of diabatic and adiabatic processes during build-ups/depletions strongly varies from event-to-event. {T}he {WWV} build-up during neutral {ENSO} phases (e.g. 1980-1982) is almost entirely controlled by meridional recharge, providing a text-book example for the recharge/discharge oscillator's theory. {O}n the other hand, diabatic processes are particularly active during the strongest {L}a {N}ina events (1984, 1988, 1999), contributing to more than 70% of the {WWV} build-up, with heating by penetrative solar fluxes explaining as much as 30% of the total build-up due to a very shallow thermocline in the eastern {P}acific. {T}his study does not invalidate the recharge/ discharge oscillator theory but rather emphasizes the importance of equatorial diabatic processes and western boundary transports in controlling {WWV} changes.},
  keywords = {{E}l {N}ino/{S}outhern {O}scillation ; {W}arm water volume ; {E}quatorial {P}acific ; {W}estern boundary currents ; {S}olar penetration ; {V}ertical mixing ; {PACIFIQUE} ; {ZONE} {EQUATORIALE}},
  booktitle = {},
  journal = {{C}limate {D}ynamics},
  volume = {38},
  numero = {5-6},
  pages = {1031--1046},
  ISSN = {0930-7575},
  year = {2012},
  DOI = {10.1007/s00382-011-1051-z},
  URL = {https://www.documentation.ird.fr/hor/fdi:010055786},
}