@article{fdi:010071355,
  title = {{D}ecadal variability of the {I}ndian and {P}acific {W}alker cells since the 1960s : do they covary on decadal time scales ?},
  author = {{H}an, {W}. {Q}. and {M}eehl, {G}. {A}. and {H}u, {A}. {X}. and {Z}heng, {J}. and {K}enigson, {J}. and {V}ialard, {J}{\'e}r{\^o}me and {R}ajagopalan, {B}. and {Y}anto,},
  editor = {},
  language = {{ENG}},
  abstract = {{P}revious studies have investigated the centennial and multidecadal trends of the {P}acific and {I}ndian {O}cean {W}alker cells ({WC}s) during the past century, but have obtained no consensus owing to data uncertainties and weak signals of the long-term trends. {T}his paper focuses on decadal variability (periods of one to few decades) by first documenting the variability of the {WC}s and warm-pool convection, and their covariability since the 1960s, using in situ and satellite observations and reanalysis products. {T}he causes for the variability and covariability are then explored using a {B}ayesian dynamic linear model, which can extract nonstationary effects of climate modes. {T}he warm-pool convection exhibits apparent decadal variability, generally covarying with the {I}ndian and {P}acific {O}cean {WC}s during winter ({N}ovember-{A}pril) with enhanced convection corresponding to intensified {WC}s, and the {I}ndian-{P}acific {WC}s covary. {D}uring summer ({M}ay-{O}ctober), the warm-pool convection still highly covaries with the {P}acific {WC} but does not covary with the {I}ndian {O}cean {WC}, and the {I}ndian-{P}acific {WC}s are uncorrelated. {T}he wintertime coherent variability results from the vital influence of {ENSO} decadal variation, which reduces warm-pool convection and weakens the {WC}s during {E}l {N}ino-like conditions. {D}uring summer, while {ENSO} decadal variability still dominates the {P}acific {WC}, decadal variations of {ENSO}, the {I}ndian {O}cean dipole, {I}ndian summer monsoon convection, and tropical {I}ndian {O}cean {SST} have comparable effects on the {I}ndian {O}cean {WC} overall, with monsoon convection having the largest effect since the 1990s. {T}he complex causes for the {I}ndian {O}cean {WC} during summer result in its poor covariability with the {P}acific {WC} and warm-pool convection.},
  keywords = {{PACIFIQUE} ; {OCEAN} {INDIEN}},
  booktitle = {},
  journal = {{J}ournal of {C}limate},
  volume = {30},
  numero = {21},
  pages = {8447--8468},
  ISSN = {0894-8755},
  year = {2017},
  DOI = {10.1175/jcli-d-16-0783.1},
  URL = {https://www.documentation.ird.fr/hor/fdi:010071355},
}