Wavelet transform for a quasi-120-day oscillation of polar motion and atmospheric excitation.

Details Wavelet transform for a quasi-120-day oscillation of polar motion and atmospheric excitation. Wavelet transform for a quasi-120-day oscillation of polar motion and atmospheric excitation.

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996acasn..37..361z&link_type=abstract

Acta Astron. Sin., Vol. 37, No. 4, p. 361 - 367

Astronomy and Astrophysics

Astronomy

Polar Motion: Oscillations, Earth Rotation: Variations, Earth Atmosphere: Motions

Scientific paper

A time-dependent spectrum characteristic for the quasi-120-day oscillation of Earth rotation has been studied by adopting a new method-wavelet transform. It is confirmed that there exists the quasi-120-day oscillation in the series of polar motion and LOD. It is pointed out that the quasi-120-day oscillation of polar motion is largely excitation by atmospheric motion. It is interesting that when EL Nino occurs, the quasi-120-day oscillation of polar motion becomes weak while the quasi-120-day oscillation of LOD is strengthening.

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