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Journal of Geodesy

, Volume 75, Issue 2–3, pp 164–168 | Cite as

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

  • Y. H. Zhou
  • D. W. Zheng
  • X. H. Liao

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.

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

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Copyright information

© Springer-Verlag Berlin Heidelberg 2001

Authors and Affiliations

  • Y. H. Zhou
    • 1
  • D. W. Zheng
    • 1
  • X. H. Liao
    • 1
  1. 1. Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, P.R. China e-mail: yhzhou@center.shao.ac.cn; Tel.: +86-21-64386191; Fax: +86-21-64384618CN

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