@article{fdi:010040685,
  title = {{I}ndo-{P}acific {S}ea surface temperature perturbations associated with intraseasonal oscillations of tropical convection},
  author = {{D}uvel, {J}. {P}. and {V}ialard, {J}{\'e}r{\^o}me},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he intraseasonal variability ({ISV}; 20-90 days) of the {SST} is examined using 7 yr of data from the {T}ropical {R}ainfall {M}easuring {M}ission's ({TRMM}) {M}icrowave {I}mager ( {TMI}). {T}he {ISV} of the {SST} is larger in the summer hemisphere and in regions of relatively small ocean mixed layer depth ({MLD}). {F}or these regions, the reddening of the {SST} spectrum in regard to the surface flux spectrum suggests that the {ISV} of the {SST} is mostly controlled by the integration of the local surface forcing by ocean mixed layer. {H}owever, the precise origin of large-scale organized perturbations of the {SST} also depends on region and season. {S}ince the {ISV} of the convection is an intermittent phenomenon, the local mode analysis ({LMA}) technique is used to detect only the ensemble of intraseasonal events that are well organized at large scale. {T}he {LMA} technique is further developed in this paper in order to perform multivariate analysis given patterns of {SST} and surface wind perturbations associated specifically with these intraseasonal events. {D}uring boreal winter, the basin- scale eastward propagation of the convective perturbation is present only over the {I}ndian {O}cean {B}asin. {T}he intraseasonal {SST} response to convective perturbations is large and recurrent over thin mixed layer regions located north of {A}ustralia and in the {I}ndian {O}cean between 5 and 10 {S}. {B}y contrast, there is little {SST} response in the western {P}acific basin and no clear eastward propagation of the convective perturbation. {D}uring boreal summer, the {SST} response is large over regions with thin mixed layers located north of the {B}ay of {B}engal, in the {A}rabian {S}ea, and in the {C}hina {S}ea. {T}he northeastward propagation of the convective perturbation over the {B}ay of {B}engal is associated with a standing oscillation of the {SST} and the surface wind between the equator and the northern part of the bay. {I}n fact, many intraseasonal events mostly concern a single basin, suggesting that the interbasin organization is not a necessary condition for the existence of coupled intraseasonal perturbations of the convection. {T}he perturbation of the surface wind tends to be larger to the west of the large-scale convective perturbation (like for a {G}ill- type dynamical response). {F}or eastward propagating perturbations, the cooling due to the reinforcement of the wind (i. e., surface turbulent heat flux) thus generally lags the radiative cooling due to the reduction of the surface solar flux by the convective cloudiness. {T}his large-scale {G}ill-type response of the surface wind also cools the surface to the west of the basin (northwest {A}rabian {S}ea and northwest {P}acific {O}cean), even if the convection is locally weak. {A}n intriguing result is a frequently occurring small delay between the maximum surface wind and the minimum {SST}. {D}ifferent explanations are invoked, like a rapid surface cooling due to the vanishing of an ocean warm layer (diurnal surface warming due to solar radiation in low wind conditions) as soon as the wind increases.},
  keywords = {},
  booktitle = {},
  journal = {{J}ournal of {C}limate},
  volume = {20},
  numero = {13},
  pages = {3056--3082},
  ISSN = {0894-8755},
  year = {2007},
  DOI = {10.1175/{JCLI}4144.1},
  URL = {https://www.documentation.ird.fr/hor/fdi:010040685},
}