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

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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.