Mathematics – Logic
Scientific paper
Jun 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996acasn..37..124q&link_type=abstract
Acta Astron. Sin., Vol. 37, No. 2, p. 124 - 131
Mathematics
Logic
Polar Motion: Earth Atmosphere
Scientific paper
The geodetic excitation set derived by the new highly accurate polar motion data (space 93 series) and the atmospheric excitation function compiled by the Japan Meteorological Agency (JMA) are used to investigate the nonseasonal oscillation. A relatively strong 40 to 60-days oscillation is revealed from these data series. The geodetic excitation is related to the atmospheric pressure change on nonseasonal timescale. The coherence estimates between the series are of the order of 0.44, and 0.58. Thus, these estimates imply that the contribution of atmospheric equatorial angular momentum (EAM) to the nonseasonal oscillation of polar motion in the direction of the Y-axis is slightly larger than that in the direction of the X-axis. The nonseasonal oscillations of the atmospheric and geodetic excitation functions have similar time-varying spectra. These facts seem likely that the nonseasonal oscillation is at least partially driven by surface air pressure change, which plays the role of excitation in the polar motion with periods less than 140 days.
Gul Zhennian
Qian Changxia
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