Atmospheric excitation of polar motion - Comparison of the polar motion spectrum with spectra of effective atmospheric angular momentum functions

Details Atmospheric excitation of polar motion - Comparison of the polar motion spectrum with spectra of effective atmospheric angular momentum functions Atmospheric excitation of polar motion - Comparison of the polar motion spectrum with spectra of effective atmospheric angular momentum functions

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988baicz..39..172v&link_type=abstract

Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 39, May 1988, p. 172-185.

Astronomy and Astrophysics

Astronomy

7

Angular Momentum, Atmospheric Circulation, Earth Rotation, Polar Wandering (Geology), Annual Variations, Ground Water, Transfer Functions

Scientific paper

The spectra of different combinations of the effective atmospheric angular momentum functions are compared with the spectrum of polar motion using fast Fourier transform. The transfer function for an earth model with a fluid core, visco-elastic mantle, and linearly reacting ocean is used to compare the amplitudes and phases of the spectra. It is found that for the dominating annual term, the influence of the wind component is substantially smaller than data sampled at midnight UT would suggest. It is suggested that the combination of the resting wind term with the pressure term corrected for inverted barometer is not sufficient to explain the observed polar motion with annual period. It is concluded that the forced polar motion can probably be explained by the combined effect of the atmosphere and global change in ground water storage.

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