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Disruptions of El Niño–Southern Oscillation Teleconnections by the Madden–Julian Oscillation

Hoell, Andrew ; Barlow, Mathew ; Wheeler, Matthew C. ; Funk, Chris

Geophysical Research Letters, 16 February 2014, Vol.41(3), pp.998-1004 [Periódico revisado por pares]

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  • Título:
    Disruptions of El Niño–Southern Oscillation Teleconnections by the Madden–Julian Oscillation
  • Autor: Hoell, Andrew ; Barlow, Mathew ; Wheeler, Matthew C. ; Funk, Chris
  • Assuntos: El Nino ‐ Southern Oscillation ; Madden Julian Oscillation ; Disruption
  • É parte de: Geophysical Research Letters, 16 February 2014, Vol.41(3), pp.998-1004
  • Descrição: The El Niño–Southern Oscillation (ENSO) is the leading mode of interannual variability, with global impacts on weather and climate that have seasonal predictability. Research on the link between interannual ENSO variability and the leading mode of intraseasonal variability, the Madden–Julian oscillation (MJO), has focused mainly on the role of MJO initiating or terminating ENSO. We use observational analysis and modeling to show that the MJO has an important simultaneous link to ENSO: strong MJO activity significantly weakens the atmospheric branch of ENSO. For weak MJO conditions relative to strong MJO conditions, the average magnitude of ENSO‐associated tropical precipitation anomalies increases by 63%, and the strength of hemispheric teleconnections increases by 58%. Since the MJO has predictability beyond three weeks, the relationships shown here suggest that there may be subseasonal predictability of the ENSO teleconnections to continental circulation and precipitation. MJO modifies the magnitude of tropical Pacific precipitation during ENSO MJO modifies the midlatitude teleconnections during ENSO Low‐level wind shows a link between MJO activity and ENSO air‐sea coupling

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