Other
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999itn....26...67z&link_type=abstract
The impact of El Niño and other low-frequency signals on Earth rotation and global Earth system parameters, David A. Salstein, B
Other
Hilbert Transform, Enso, Intrasesonal Lod Variation
Scientific paper
The Hubert transform is used to extract the amplitude modulation Signals for the intraseasonal Variation of Length of Day ranging from 1962 to 1996. The results reveal that the intraseasonal Length of Day amplitude modulation Variation has not only a positive secular trend, but also an interannual Variation which is ahead of the ENSO evolution. The amplitude modulations for the quasi-50-day oscillation and the quasi-120-day oscillation have been studied separately. This shows that the peaks of the quasi-50-day oscillation amplitude modulation always occur longer than one year before happening of each ENSO event and seem to be the precursor of the ENSO event, and this is the same with the atmospheric research results. They also indicate the dominant correspondence between the quasi-120-day oscillation amplitude modulation and ENSO events since 1976 and absolutely negatively correlation with ENSO before 1972 because of phase change 180 degree in the evolution of the quasi-120-day oscillation amplitude modulation time series during the beginning of the 1970's.
Gao Bu-Xi
Zhong Min
Zhu Yao-Zhong
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