Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pabei..19..317g&link_type=abstract
Progress in Astronomy, Vol. 19, No. 2, p. 317 - 321 (2001). In: Proceedings for the First National Academic Conference of the Ch
Astronomy and Astrophysics
Astronomy
Geophysical Fluid Excitations, Annual Wobble, Irregular Wobble, Polar Motion
Scientific paper
Polar motion is generally considered to include five main periodic or non-periodic wobbles, which are secular wobble, Chandler wobble, annual wobble, sub-seasonal wobble and irregular wobble, respectively. As the geophysical fluid excitations within different frequency scale can lead to the different responses of polar motion, here a Fourier de-convolution transform method is used to extract, in frequency domein, the five main wobbles from polar motion. Then these specific wobbles are compared with their corresponding geophysical fluid excitations one by one. Our results show that annual wobble and its excitation have time variable amplitudes and phases, so their year to year comparison would be a good constrain in angular momentum domain by testing the simulated atmospheric, oceanic and hydrological angular momentum functions deduced from general circulation models. In addition, irregular wobble may detect the abnormal signals forced by global unusual meteorological events.
Gao Buxi
Lei Xiaoping
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