Physics
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002ansho..23...12l&link_type=abstract
Annals of Shanghai Observatory, Academia Sinicaiss. No. 23, p. 12-20
Physics
Chandler Wobble, Estimates, Polar Wandering (Geology), Q Factors, Data Bases, Polar Coordinates, Atmospheric Circulation
Scientific paper
By using the data series of the polar coordinates and atmospheric angular momentum (AAM) during 1984 approx. to 1999, effects of different Chandler periods and quality factor Q on the estimates of power spectral density (psd) of the observed polar motion excitation, and of squared coherence and coherent phases between the observed excitation and the AAM excitation are analyzed. Results show large differences in psd of the observed excitation, and in squared coherence between the observed excitation and the AAM excitations for different Chandler periods and Q. Thus, when comparing the observed polar motion excitation with one of the geophysical excitations (e.g. AAM excitation) , one should not choose the Chandler period by a better approximation of the observed one to the geophysical one, because the observed excitation is a comprehensive results of various geophysical excitation sources.
Liao De-Chun
Liao Xin-hao
Zhou Yong-Hong
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