Earth's rotation variations: a wavelet analysis

被引：59

作者：

Chao, Benjamin F. ^{[1
]}

Chung, WeiYung ^{[1
]}

Shih, ZongRong ^{[1
]}

Hsieh, Yikai ^{[1
]}

机构：

[1] Acad Sinica, Inst Earth Sci, Taipei 115, Taiwan

来源：

TERRA NOVA | 2014年 / 26卷 / 04期

关键词：

POLAR MOTION; LENGTH; CORE; EXCITATION;

D O I：

10.1111/ter.12094

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

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 similar to 13-year quasi-periodic signal. The polar-motion excitation for the period 1900-2012 validates the existence of the similar to 26-year Markowitz wobble and shows an similar to 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 time-scales are still far from understood.

引用

页码：260 / 264

页数：5

共 26 条

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