Wavelet analysis of interannual LOD, AAM, and ENSO: 1997–98 El Niño and 1998–99 La Niña signals

Abstract.

 On the basis of the data series of the length of day (LOD), the atmospheric angular momentum (AAM) and the Southern Oscillation Index (SOI) for January 1970–June 1999, the relationship among Interannual LOD, AAM, and the EL Niño/Southern Oscillation (ENSO) is analyzed by the wavelet transform method. The results suggest that they have similar time-varying spectral structures. The signals of 1997–98 El Niño and 1998–99 La Niña events can be detected from the LOD or AAM data.

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Received: 25 January 2000 / Accepted: 9 January 2001

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Zhou, Y., Zheng, D. & Liao, X. Wavelet analysis of interannual LOD, AAM, and ENSO: 1997–98 El Niño and 1998–99 La Niña signals. Journal of Geodesy 75, 164–168 (2001). https://doi.org/10.1007/s001900100173

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  • Key words: Earth rotation
  • Length-of-day variation
  • Atmospheric angular momentum
  • EL Niño/Southern Oscillation