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Search for the 531-day-period Wobble Signal in the Polar Motion Based on Eemd : Volume 22, Issue 4 (05/08/2015)

By Ding, H.

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Book Id: WPLBN0004019847
Format Type: PDF Article :
File Size: Pages 12
Reproduction Date: 2015

Title: Search for the 531-day-period Wobble Signal in the Polar Motion Based on Eemd : Volume 22, Issue 4 (05/08/2015)  
Author: Ding, H.
Volume: Vol. 22, Issue 4
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: copernicus

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Shen, W., & Ding, H. (2015). Search for the 531-day-period Wobble Signal in the Polar Motion Based on Eemd : Volume 22, Issue 4 (05/08/2015). Retrieved from http://kindle.worldlibrary.net/


Description
Description: School of Geodesy and Geomatics, Key Laboratory of Geospace Environment and Geodesy of the Ministry of Education, Wuhan University, Wuhan 430079, China. 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 feature of EEMD, the 531 dW can be confirmed to be present in PM based on the differences of the amplitudes and phases between different intrinsic mode functions. Results from three sub-series divided from the EOP C04 series show that the period of the 531 dW is subject to variations, in the range of 530.9–524 days, and its amplitude is also time-dependent (about 2–11 mas). Synthetic tests are carried out to explain why the 531 dW can only be observed in recent 30-year PM time series after using EEMD. The 531 dW is also detected in the two longest available superconducting gravimeter (SG) records, which further confirms the presence of the 531 dW. The confirmation of the 531 dW existence could be significant in establishing a more reasonable Earth rotation model and may effectively contribute to the prediction of the PM and its mechanism interpretation.

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

Excerpt
Chen, W., Shen, W. B., Han, J., and Li, J.: Free wobble of the triaxial Earth: theory and comparisons with International Earth Rotation Service (IERS) data, Surv. Geophys., 30, 39–49, 2009.; Chen, W., Shen, W. B., and Dong, X. W.: Atmospheric Excitation of Polar Motion, P. Soc. Photo-Opt. Ins., 13, 130–136, 2010.; Chen, W., Ray, J., Li, J., Huang, C., and Shen, S.: Polar motion excitations for an Earth model with frequency-dependent responses: 1. A refined theory with insight into the Earth's rheology and core-mantle coupling, J. Geophys. Res., 118, 1–20, 2013a.; Chen, W., Ray, J., Li, J., Shen, S., and Huang, C.: Polarmotion excitations for an Earth model with frequency-dependent responses: 2. Numerical tests of the meteorological excitations, J. Geophys. Res., 118, 1–13, 2013b.; Ding, H. and Chao, B. F.: Detecting harmonic signals in a noisy time-series: the z-domain Autoregressive (AR-z) spectrum, Geophys. J. Int., 201, 1287–1296, 2015.; Ding, H. and Shen, W. B.: Determination of the complex frequencies for the normal modes below 1 mHz after the 2010 Maule and 2011 Tohoku earthquakes, Ann. Geophys., 56, 5, doi:10.4401/ag-6400, 2013.; Franzke, C.: Multi-scale analysis of teleconnection indices: climate noise and nonlinear trend analysis, Nonlin. Processes Geophys., 16, 65–76, doi:10.5194/npg-16-65-2009, 2009.; Gross, R. S., Fukumori, I., and Menemenlis, D.: Atmospheric and oceanic excitation of the Earth's wobbles during 1980–2000, J. Geophys. Res., 108, 2370, doi:10.1029/2002JB002143, 2003.; Höpfner, J.: Chandler and annual wobbles based on space-geodetic measurements, J. Geodyn., 36, 369–381, 2003.; Huang, N. E., Shen, Z., Long, S. R., Wu, M. C., Shih, H. H., Zheng, Q., Yen, N. C., Tung, C. C., and Liu, H. H.: The empirical mode decomposition and the Hilbert spectrum for nonlinear and non-stationary time series analysis, Proc. Roy. Soc. Lond., A454, 903–995, 1998.; Huang, N. E., Shen, Z., Long, S. R., Wu, M. C., Shih, H. H., Zheng, Q., Yen, N. C., Tung, C. C., and Liu, H. H.: A review on Hilbert-Huang transform: Method and its applications to geophysical studies, Rev. Geophys., 46, RG2006, doi:10.1029/2007RG000228, 2008.; Jackson, L. P. and Mound, J. E.: Geomagnetic variation on decadal time scales: What can we learn from Empirical Mode Decomposition?, Geophy. Res. Lett., 37, L14307, doi:10.1029/2010GL043455, 2010.; King, M.: Interactive comment on Search for the 531 day-period wobble signal in the polar motion based on EEMD by H. Ding and W. B. Shen, Nonlin. Processes Geophys. Discuss., 2, C163–C168, 2015.; King, M. A. and Watson, C. S.: Geodetic vertical velocities affected by recent rapid changes in polar motion, Geophys. J. Int., 199, 1161–1165, 2014.; Carter, W. E.: Frequency modulation of the Chandlerian component of polar motion, J. Geophys. Res., 86, 1653–1658, 1981.; Lee, T., and Ouarda, T. B. M. J.: Prediction of climate nonstationary oscillation processes with empirical mode decomposition, J. Geophys. Res., 116, D06107, doi:10.1029/2010JD015142, 2011.; Liu, H. Y., Lin, Z. S., Qi, X. Z., Li, Y. X., Yu, M. T., Yang, H., and Shen, J.: Possible link between Holocene East Asian monsoon and solar activity obtained from the EMD method, Nonlin. Processes Geophys., 19, 421–430, doi:10.5194/npg-19-421-2012, 2012.; Morgan, P. J., King, R. W. and Shapiro, I. I.: Spectral analysis of variation of latitude derived from lunar laser ranging and satellite Doppler observations (abstract), Eos Trans., AGU, 63, p. 302, 1982.; Wu, Z. H. and Huang, N. E.: Ensemble empirical mode de

 

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