@article{fdi:010044088,
  title = {{O}cean-atmosphere coupling in the monsoon intraseasonal oscillation : a simple model study},
  author = {{B}ellon, {G}. and {S}obel, {A}. {H}. and {V}ialard, {J}{\'e}r{\^o}me},
  editor = {},
  language = {{ENG}},
  abstract = {{A} simple coupled model is used in a zonally symmetric aquaplanet configuration to investigate the effect of ocean-atmosphere coupling on the {A}sian monsoon intraseasonal oscillation. {T}he model consists of a linear atmospheric model of intermediate complexity based on quasi-equilibrium theory coupled to a simple, linear model of the upper ocean. {T}his model has one unstable eigenmode with a period in the 30-60-day range and a structure similar to the observed northward-propagating intraseasonal oscillation in the {B}ay of {B}engal/west {P}acific sector. {T}he ocean-atmosphere coupling is shown to have little impact on either the growth rate or latitudinal structure of the atmospheric oscillation, but it reduces the oscillation's period by a quarter. {A}t latitudes corresponding to the north of the {I}ndian {O}cean, the sea surface temperature ({SST}) anomalies lead the precipitation anomalies by a quarter of a period, similarly to what has been observed in the {B}ay of {B}engal. {T}he mixed layer depth is in phase opposition to the {SST}: a monsoon break corresponds to both a warming and a shoaling of the mixed layer. {T}his behavior results from the similarity between the patterns of the predominant processes: wind-induced surface heat flux and wind stirring. {T}he instability of the seasonal monsoon flow is sensitive to the seasonal mixed layer depth: the oscillation is damped when the oceanic mixed layer is thin (about 10 m deep or thinner), as in previous experiments with several models aimed at addressing the boreal winter {M}adden-{J}ulian oscillation. {T}his suggests that the weak thermal inertia of land might explain the minima of intraseasonal variance observed over the {A}sian continent.},
  keywords = {},
  booktitle = {},
  journal = {{J}ournal of {C}limate},
  volume = {21},
  numero = {20},
  pages = {5254--5270},
  ISSN = {0894-8755},
  year = {2008},
  DOI = {10.1175/2008jcli2305.1},
  URL = {https://www.documentation.ird.fr/hor/fdi:010044088},
}