Earth's rotation variations: A wavelet analysis

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题名:	Earth's rotation variations: A wavelet analysis
作者:	趙丰;Chao, Benjamin F.;Chung, WeiYung;Shih, ZongRong;Hsieh, YiKai
贡献者:	地球科學學院地球科學學系
关键词:	Earth;Geodetics;Geophysics;Meteorology;Wavelet transforms
日期:	2014-01-01
上传时间:	2026-04-23 11:32:33 (UTC+8)
出版者:	Wiley-Blackwell Publishing Ltd;Oxford: Blackwell Publishing Ltd
摘要:	摘要： Historical to up‐to‐date data of the minute variations in the solid Earth's rotation are subjected to a comprehensive time‐frequency wavelet analysis. The length‐of‐day for the period 1962–2012 confirms the presence of a prominent, robust 6‐year periodicity and reveals an anomalously strong 18.6‐year tidal oscillation as well as a ~13‐year quasi‐periodic signal. The polar‐motion excitation for the period 1900–2012 validates the existence of the ~26‐year Markowitz wobble and shows an ~8‐year quasi‐periodic signal, but no appreciable 18.6‐year periodicity. Although it is known that exchanges of angular momentum with the geophysical fluids are responsible for the rotational variations of the solid Earth, the exact physical mechanisms involved on interannual‐to‐decadal timescales are still far from understood. 其他題名： Terra Nova 出版者： Oxford: Blackwell Publishing Ltd 出版日期： 2014-08 出處： Terra nova (Oxford, England), 2014-08, Vol.26 (4), p.260-264 資源來源： Alma/SFX Local Collection 版權： 2014 John Wiley & Sons Ltd 版權： Copyright © 2014 John Wiley & Sons Ltd 識別號： ISSN: 0954-4879 識別號： ISSN: 1365-3121 識別號： EISSN: 1365-3121 識別號： DOI: 10.1111/ter.12094
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