Articles | Volume 22, issue 4
Research article
05 Aug 2015
Research article |  | 05 Aug 2015

Search for the 531-day-period wobble signal in the polar motion based on EEMD

H. Ding and W. Shen

Related subject area

Subject: Time series, machine learning, networks, stochastic processes, extreme events | Topic: Solid earth, continental surface, biogeochemistry
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Cited articles

Carter, W. E.: Frequency modulation of the Chandlerian component of polar motion, J. Geophys. Res., 86, 1653–1658, 1981.
Carter, W. E.: Refinements of the polar motion frequency modulation hypothesis, J. Geophys. Res., 87, 7025–7028, 1982.
Chambers, D. P.: Evaluation of empirical mode decomposition for quantifying multi-decadal variations and acceleration in sea level records, Nonlin. Processes Geophys., 22, 157–166, 2015.
Chao, B. F.: Autoregressive harmonic analysis of the Earth's polar motion using homogeneous International Latitude Service data, J. Geophys. Res., 88, 10299–10307, 1983.
Chao, B. F. and Gilbert, F.: Autoregressive estimation of complex eigenfrequencies in low frequency seismic spectra, Geophys. J. Roy. Astron. Soc., 63, 641–657, 1980.
Short summary
A 531-day wobble (531 dW) signal is clearly detected with a mean amplitude of about 7 mas after applying the ensemble empirical mode decomposition (EEMD) to the 1962-2013 polar motion (PM) time series. This signal is also detected in the two longest available superconducting gravimeter (SG) records. Synthetic tests are carried out to explain why the 531 dW signal can only be observed in recent 30-year PM time series after using EEMD.