Contribution of atmospheric excitation to the non-seasonal polar motion

Details Contribution of atmospheric excitation to the non-seasonal polar motion Contribution of atmospheric excitation to the non-seasonal polar motion

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996cha%26a..20..507q&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 20, Issue 4, p. 507-507.

Astronomy and Astrophysics

Astrophysics

Scientific paper

Using the new, highly accurate polar motion data (Space 33 Series) and the atmospheric excitation function compiled by Japan Meteorological Agency we find a relatively strong 40-60 d oscillation, related to atmospheric pressure changes on non-seasonal timescales. The correlation coefficient between χg1 and χa1 is 0.44, that between χg2 and χa2, 0.58, thus the contribution of atmospheric angular momentum to the non-seasonal oscillation in the polar motion is slightly stronger along the Y-axis than the X-axis. The non-seasonal oscillations of the atmospheric and geodetic excitation functions have similar time-varying spectra, especially in the χ2 component. These facts suggest that the non-seasonal oscillation with periods less than 140 d is at least partially driven by surface air pressure.

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