@article{fdi:010057100,
  title = {{T}he role of the intra-daily {SST} variability in the {I}ndian monsoon variability and monsoon-{ENSO}-{IOD} relationships in a global coupled model},
  author = {{T}erray, {P}ascal and {K}amala, {K}. and {M}asson, {S}. and {M}adec, {G}. and {S}ahai, {A}. {K}. and {L}uo, {J}. {J}. and {Y}amagata, {T}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he impact of diurnal {SST} coupling and vertical oceanic resolution on the simulation of the {I}ndian {S}ummer {M}onsoon ({ISM}) and its relationships with {E}l {N}io-{S}outhern {O}scillation ({ENSO}) and {I}ndian {O}cean {D}ipole ({IOD}) events are studied through the analysis of four integrations of a high resolution {C}oupled {G}eneral {C}irculation {M}odel ({CGCM}), but with different configurations. {T}he only differences between the four integrations are the frequency of coupling between the ocean and atmosphere for the {S}ea {S}urface {T}emperature ({SST}) parameter (2 vs. 24 h coupling) and/or the vertical oceanic resolution (31 vs. 301 levels) in the {CGCM}. {A}lthough the summer mean tropical climate is reasonably well captured with all the configurations of the {CGCM} and is not significantly modified by changing the frequency of {SST} coupling from once to twelve per day, the {ISM}-{ENSO} teleconnections are rather poorly simulated in the two simulations in which {SST} is exchanged only once per day, independently of the vertical oceanic resolution used in the {CGCM}. {S}urprisingly, when 2 h {SST} coupling is implemented in the {CGCM}, the {ISM}-{ENSO} teleconnection is better simulated, particularly, the complex lead-lag relationships between the two phenomena, in which a weak {ISM} occurs during the developing phase of an {E}l {N}io event in the {P}acific, are closely resembling the observed ones. {E}vidence is presented to show that these improvements are related to changes in the characteristics of the model's {E}l {N}io which has a more realistic evolution in its developing and decaying phases, a stronger amplitude and a shift to lower frequencies when a 2-hourly {SST} coupling strategy is implemented without any significant changes in the basic state of the {CGCM}. {A}s a consequence of these improvements in {ENSO} variability, the lead relationships between {I}ndo-{P}acific {SST}s and {ISM} rainfall resemble the observed patterns more closely, the {ISM}-{ENSO} teleconnection is strengthened during boreal summer and {ISM} rainfall power spectrum is in better agreement with observations. {O}n the other hand, the {ISM}-{IOD} teleconnection is sensitive to both {SST} coupling frequency and the vertical oceanic resolution, but increasing the vertical oceanic resolution is degrading the {ISM}-{IOD} teleconnection in the {CGCM}. {T}hese results highlight the need of a proper assessment of both temporal scale interactions and coupling strategies in order to improve current {CGCM}s. {T}hese results, which must be confirmed with other {CGCM}s, have also important implications for dynamical seasonal prediction systems or climate change projections of the monsoon.},
  keywords = {{I}ndian summer monsoon ; {E}l {N}ino-{S}outhern {O}scillation ; {I}ntra-daily {SST} variability ; {O}cean-atmosphere interactions ; {C}oupled climate model},
  booktitle = {},
  journal = {{C}limate {D}ynamics},
  volume = {39},
  numero = {3-4},
  pages = {729--754},
  ISSN = {0930-7575},
  year = {2012},
  DOI = {10.1007/s00382-011-1240-9},
  URL = {https://www.documentation.ird.fr/hor/fdi:010057100},
}