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Climate Dynamics

, Volume 44, Issue 9–10, pp 2825–2837 | Cite as

Global eastward propagation signals associated with the 4–5-year ENSO cycle

  • S.-Y. Simon WangEmail author
  • Xianan Jiang
  • Boniface Fosu
Article

Abstract

Longitude-time evolution of sea surface temperature anomalies (SSTA) reveals a slow southeastward propagation from the western North Pacific (WNP) around 20°N to the Niño-3.4 region in the equatorial Central Pacific. The propagation is manifested as a narrow, southwest-northeast oriented SSTA band across the subtropical North Pacific, and its journey takes about 2–3 years. The propagating SSTA appears to engage the initiation of the El Niño–Southern Oscillation (ENSO). The anomalies of surface winds, sea level pressure, outgoing longwave radiation, and velocity potential all exhibit a concurrent and distinct eastward propagation, one that appears to be circumglobal and is coupled with the predominant 4–5 year frequency of the ENSO cycle. It is suggested that the previously found warming/cooling in the Indian Ocean induced by El Niño/La Niña, the progressive SSTA and wind anomalies across the Indian Ocean towards the WNP, and the predominant 4–5-year frequency of the North Pacific Oscillation collectively contribute to the reported SSTA propagation . The findings implicate that monitoring the SSTA propagation from the WNP towards the tropical central Pacific could be useful in tracking the ENSO development.

Keywords

ENSO cycle SST propagation Precursor Prediction WNP 

Notes

Acknowledgments

Useful discussions with Michelle L'Heureux and TC Chen are highly appreciated. This study was supported by the NASA Grant NNX13AC37G and by the United States Agency for International Development Grant EEM-A-00-38310-00001.

Supplementary material

382_2014_2422_MOESM1_ESM.pdf (454 kb)
Supplementary material 1 (PDF 453 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • S.-Y. Simon Wang
    • 1
    • 2
    Email author
  • Xianan Jiang
    • 3
  • Boniface Fosu
    • 2
  1. 1.Utah Climate CenterUtah State UniversityLoganUSA
  2. 2.Climate Sciences ProgramUtah State UniversityLoganUSA
  3. 3.Joint Institute for Regional Earth System Science and EngineeringUCLALos AngelesUSA

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