@article{fdi:010057093,
  title = {{I}mpact of intra-daily {SST} variability on {ENSO} characteristics in a coupled model},
  author = {{M}asson, {S}. and {T}erray, {P}ascal and {M}adec, {G}. and {L}uo, {J}. {J}. and {Y}amagata, {T}. and {T}akahashi, {K}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}his paper explores the impact of intra-daily {S}ea {S}urface {T}emperature ({SST}) variability on the tropical large-scale climate variability and differentiates it from the response of the system to the forcing of the solar diurnal cycle. {O}ur methodology is based on a set of numerical experiments based on a fully global coupled ocean-atmosphere general circulation in which we alter (1) the frequency at which the atmosphere sees the {SST} variations and (2) the amplitude of the {SST} diurnal cycle. {O}ur results highlight the complexity of the scale interactions existing between the intra-daily and inter-annual variability of the tropical climate system. {N}eglecting the {SST} intra-daily variability results, in our {CGCM}, to a systematic decrease of 15% of {E}l {N}io-{S}outhern {O}scillation ({ENSO}) amplitude. {F}urthermore, {ENSO} frequency and skewness are also significantly modified and are in better agreement with observations when {SST} intra-daily variability is directly taken into account in the coupling interface of our {CGCM}. {T}hese significant modifications of the {SST} interannual variability are not associated with any remarkable changes in the mean state or the seasonal variability. {T}hey can therefore not be explained by a rectification of the mean state as usually advocated in recent studies focusing on the diurnal cycle and its impact. {F}urthermore, we demonstrate that {SST} high frequency coupling is systematically associated with a strengthening of the air-sea feedbacks involved in {ENSO} physics: {SST}/sea level pressure (or {B}jerknes) feedback, zonal wind/heat content (or {W}yrtki) feedback, but also negative surface heat flux feedbacks. {I}n our model, nearly all these results (excepted for {SST} skewness) are independent of the amplitude of the {SST} diurnal cycle suggesting that the systematic deterioration of the air-sea coupling by a daily exchange of {SST} information is cascading toward the major mode of tropical variability, i.e. {ENSO}.},
  keywords = {{D}iurnal cycle ; {C}oupled climate model ; {E}l {N}ino-{S}outhern {O}scillation ; {O}cean-atmosphere interactions},
  booktitle = {},
  journal = {{C}limate {D}ynamics},
  volume = {39},
  numero = {3-4},
  pages = {681--707},
  ISSN = {0930-7575},
  year = {2012},
  DOI = {10.1007/s00382-011-1247-2},
  URL = {https://www.documentation.ird.fr/hor/fdi:010057093},
}