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Search for the 531-day-period wobble signal in the polar motion based on EEMD
2015
Nonlinear Processes in Geophysics
<p><strong>Abstract.</strong> In this study, we use a nonlinear and non-stationary time series analysis method, the ensemble empirical mode decomposition method (EEMD), to analyze the polar motion (PM) time series (EOP C04 series from 1962 to 2013) to find a 531-day-period wobble (531 dW) signal. The 531 dW signal has been found in the early PM series (1962–1977), but cannot be found in the recent PM series (1978–2013) using conventional analysis approaches. By virtue of the demodulation
doi:10.5194/npg-22-473-2015
fatcat:2y2gmreplnb7vjcizfeqbwnt7u