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Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union
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Volume 22, issue 4
Nonlin. Processes Geophys., 22, 473–484, 2015
https://doi.org/10.5194/npg-22-473-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Nonlin. Processes Geophys., 22, 473–484, 2015
https://doi.org/10.5194/npg-22-473-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

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

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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.
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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.
A 531-day wobble (531 dW) signal is clearly detected with a mean amplitude of about 7 mas after...
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