Articles | Volume 22, issue 4
https://doi.org/10.5194/npg-22-473-2015
https://doi.org/10.5194/npg-22-473-2015
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
Extraction of periodic signals in Global Navigation Satellite System (GNSS) vertical coordinate time series using the adaptive ensemble empirical modal decomposition method
Weiwei Li and Jing Guo
Nonlin. Processes Geophys., 31, 99–113, https://doi.org/10.5194/npg-31-99-2024,https://doi.org/10.5194/npg-31-99-2024, 2024
Short summary
Multifractal structure and Gutenberg-Richter parameter associated with volcanic emissions of high energy in Colima, México (years 2013–2015)
Marisol Monterrubio-Velasco, Xavier Lana, and Raúl Arámbula-Mendoza
Nonlin. Processes Geophys. Discuss., https://doi.org/10.5194/npg-2024-2,https://doi.org/10.5194/npg-2024-2, 2024
Revised manuscript accepted for NPG
Short summary
Stability and uncertainty assessment of geoelectrical resistivity model parameters: a new hybrid metaheuristic algorithm and posterior probability density function approach
Kuldeep Sarkar, Jit V. Tiwari, and Upendra K. Singh
Nonlin. Processes Geophys., 31, 7–24, https://doi.org/10.5194/npg-31-7-2024,https://doi.org/10.5194/npg-31-7-2024, 2024
Short summary
Application of Lévy processes in modelling (geodetic) time series with mixed spectra
Jean-Philippe Montillet, Xiaoxing He, Kegen Yu, and Changliang Xiong
Nonlin. Processes Geophys., 28, 121–134, https://doi.org/10.5194/npg-28-121-2021,https://doi.org/10.5194/npg-28-121-2021, 2021
Short summary
Seismic section image detail enhancement method based on bilateral texture filtering and adaptive enhancement of texture details
Xiang-Yu Jia and Chang-Lei DongYe
Nonlin. Processes Geophys., 27, 253–260, https://doi.org/10.5194/npg-27-253-2020,https://doi.org/10.5194/npg-27-253-2020, 2020
Short summary

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.
Download
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.