Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999acasn..40..101z&link_type=abstract
Acta Astron. Sin., Vol. 40, No. 1, p. 101 - 106
Astronomy and Astrophysics
Astronomy
1
Earth Rotation: Variations
Scientific paper
The Hilbert 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 about 50-day oscillation and the about 120-day oscillation have been studied separately. This shows that the peaks of the approximately 50-day oscillation amplitude modulation always occur longer than one year before the appearance of each ENSO event. They also indicate the dominant correspondence between the about 120-day oscillation amplitude modulation and ENSO events since 1976 and the absolutely negative correlation with ENSO before 1972 because of phase change of 180 degrees in the evolution of the about 120-day oscillation amplitude modulation time series at the beginning of the 1970's.
Gao Buxi
Zhong Min
Zhu Yaozhong
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