@article{fdi:010055946,
  title = {{R}obustness of {SST} teleconnections and precursory patterns associated with the {I}ndian summer monsoon},
  author = {{B}oschat, {G}. and {T}erray, {P}ascal and {M}asson, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}his work attempts to reconcile in a common and comprehensive framework the various conflicting results found in the literature regarding {I}ndian {S}ummer {M}onsoon ({ISM}) rainfall-{S}ea {S}urface {T}emperature ({SST}) relationships, especially the links with {E}l-{N}io {S}outhern {O}scillation ({ENSO}) and the {I}ndian {O}cean {D}ipole ({IOD}). {T}o do so, we first examine the linear relationships between {ISM} rainfall and global {SST} anomalies during 1950-1976 and 1979-2006 periods. {O}ur results highlight the existence of significant modulations in {SST} teleconnections and precursory patterns between the first ({J}une-{J}uly, {JJ}) and second part ({A}ugust-{S}eptember, {AS}) of the monsoon. {T}his {JJ}-{AS} rainfall dichotomy is more pronounced after the 1976-1977 climate regime shift and tends to blur the global {ISM}-{ENSO} signal during the recent period, leading to an apparent weakening of this relationship at the seasonal time scale. {A}lthough {ISM} rainfall in {JJ} and {AS} is still strongly linked to {ENSO} over both periods, the lead-lag relationships between {ENSO} and {AS} {I}ndian rainfall have changed during recent decades. {I}ndeed, {ENSO} variability in the preceding boreal winter has now a significant impact on rainfall variability during the second half of {ISM}. {T}o evaluate in more details the impact of this {JJ}-{AS} dichotomy on the {ISM}-{ENSO}-{IOD} relationships, {ISM} correlations are also examined separately during {E}l {N}io and {L}a {N}ia years. {R}esults indicate that the early onset of {E}l {N}io during boreal spring causes deficient monsoon rainfall in {JJ}. {I}n response to weaker monsoon winds, warm {SST} anomalies appear in the west equatorial {IO}, generating favorable conditions for the development of a positive {IOD} in {AS}. {L}ocal air-sea processes triggered by the {SST} anomalies in the eastern node of {IOD} seem, in turn, to have a more active role on {AS} rainfall variability, as they may counteract the negative effect of {E}l {N}io on {ISM} rainfall via a modulation of the local {H}adley circulation in the eastern {IO}. {T}he {JJ}-{AS} rainfall dichotomy and its recent amplification may then result from an enhancement of these {IO} feedbacks during recent {E}l {N}io years. {T}his explains why, although {E}l {N}io events are stronger, a weakening of the {ISM}-{ENSO} relationship is observed at the seasonal scale after 1979. {R}esults during {L}a {N}ia years are consistent with this hypothesis although local processes in the southeast {IO} now play a more prominent role and act to further modulate {ISM} rainfall in {AS}. {F}inally, our results highlight the existence of a biennal rhythm of the {IOD}-{ENSO}-{ISM} system during the recent period, according to which co-occurring {E}l {N}io and positive {IOD} events tend to be followed by a warming of the {IO}, a wet {ISM} during summer and, finally, a {L}a {N}ia event during the following boreal winter.},
  keywords = {{I}ndian summer monsoon ; {S}ea surface temperature ; {ENSO} ; {I}ndian {O}cean ; dipole},
  booktitle = {},
  journal = {{C}limate {D}ynamics},
  volume = {38},
  numero = {11-12},
  pages = {2143--2165},
  ISSN = {0930-7575},
  year = {2012},
  DOI = {10.1007/s00382-011-1100-7},
  URL = {https://www.documentation.ird.fr/hor/fdi:010055946},
}