Other
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001acasn..42..278w&link_type=abstract
Acta Astronomica Sinica, Vol.42, no.3, p.278-286.
Other
3
Inferred Excitation, Atmospheric Angular Momentum, High Frequency Oscillation
Scientific paper
The inferred excitation function() derived from geodetic motion series EOP(IERS 97C04) and of the atmospheric angular momentum(AAM) provided by NCEP/NCAR during 1988-1999 are used to compare the AAM contribution to the polar motion excitation in high-frequency variation(12-42cpy) by several analysis methods in this paper. It is shown by complex-Wavelet Transform and power spectra that there are high peaks and the similar feature between and . The peaks for are lower in comparison with those in . Their cross-correlation coefficients are 0.75(retrograde) and 0.6 (prograde) respectively. The squared coherence phase show is about one day ahead of . These results indicate that atmosphere variation is the main source of the polar motion excitation in high frequency range. Additionally. It has more contribution on the retrograde component. However, because of the non-stationary features on phase and amplitude, it suggests that these may be excitation sources other than AAM for the polar motion in high frequency. More investigation should be down.
Gu Zhen-Nian
Jin Wen-Jing
Wang Bao-Wei
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