@article{fdi:010057939,
  title = {{I}ntraseasonal tropical atmospheric variability associated with the two flavors of {E}l {N}ino},
  author = {{G}ushchina, {D}. and {D}ewitte, {B}oris},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he characteristics of intraseasonal tropical variability ({ITV}) associated with the two flavors of {E}l {N}ino [i.e., the canonical or eastern {P}acific ({EP}) {E}l {N}ino and the {M}odoki or central {P}acific ({CP}) {E}l {N}ino] are documented using composite and regression analysis. {D}ouble space time {F}ourier analysis is applied to the {NCEP}-{NCAR} zonal wind at 850 h{P}a ({U}850) to separate the different components of the {ITV} in the tropical troposphere, which is then used to define indices of wave activity, and document the spatial pattern of the waves. {I}t is shown that the {ITV} characteristics are altered during {CP} {E}l {N}ino compared to the typical seasonal dependence of the {ITV}-{ENSO} relationship. {I}n particular, while {EP} {E}l {N}ino is characterized by enhanced {MJO} and equatorial {R}ossby ({ER}) wave activity during spring summer prior to the {ENSO} peak, during {CP} {E}l {N}ino, the {ITV} activity is increased during the mature and decaying phases. {I}t is suggested that {ITV} is more propitious to the triggering of the {EP} event: while during the {CP} event, it contributes mostly to the persistence of positive {SST} anomalies. {T}he oceanic response of these {ITV} anomalous patterns is further investigated in the {S}imple {O}cean {D}ata {A}ssimilation ({SODA}) reanalysis by documenting the seasonal evolution of the intraseasonal equatorial oceanic {K}elvin wave ({IEKW}) activity during the two flavors of {E}l {N}ino. {I}t is shown that anomalous westerlies associated with {ITV} may generate the corresponding response in the ocean in the form of anomalous {IEKW} activity.},
  keywords = {},
  booktitle = {},
  journal = {{M}onthly {W}eather {R}eview},
  volume = {140},
  numero = {11},
  pages = {3669--3681},
  ISSN = {0027-0644},
  year = {2012},
  DOI = {10.1175/mwr-d-11-00267.1},
  URL = {https://www.documentation.ird.fr/hor/fdi:010057939},
}