气候变化领域集成服务门户(CCPortal): Formulation of a Triaxial Three-Layered Earth Rotation: Theory and Rotational Normal Mode Solutions

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DOI	10.1029/2019JB018571
	Formulation of a Triaxial Three-Layered Earth Rotation: Theory and Rotational Normal Mode Solutions
	Guo Z.; Shen W.
发表日期	2020
ISSN	21699313
卷号	125 期号:3
英文摘要	In this study, we formulated a triaxial three-layered anelastic Earth rotation theory considering various core-mantle couplings, including the pressure and gravitational couplings acting on the elastic inner core by the outer core and mantle, and the viscoelectromagnetic couplings between the outer core and mantle and between the outer and inner cores. With this formulation, using the eigenvalue method, we solved four rotational normal modes, including the Chandler Wobble (CW), Free Core Nutation (FCN), Free Inner Core Nutation (FICN), and the Inner Core Wobble (ICW). The triaxiality of the actual Earth has notable effects on rotational normal modes, that is, 0.005, 0.0, (Formula presented.) 0.071, and 1.174 d (mean solar days), respectively, for the CW, FCN, FICN, and ICW. In the case that the triaxiality is bigger, for instance, if the Earth's equatorial dynamical ellipticity were (Formula presented.), which is 1 order of magnitude larger than the presently determined ellipticity ((Formula presented.)), the CW and ICW periods will be lengthened by 3.579 and 94.912 d, and the FICN period will be decreased by 0.591 d. Based on our present knowledge, the numerical solutions of the four normal modes under the new rotation frame suggest that the periods of CW, FCN, FICN, and ICW are, respectively, 432.2, 429.9, 934.0, and 2,718.7 d. Our theory for Earth can be extended to other planets in our solar system. ©2020. The Authors.
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187893
作者单位	Department of Geophysics, School of Geodesy and Geomatics/Key Laboratory of Geospace Environment and Geodesy, Wuhan University, Wuhan, China; State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, China
推荐引用方式 GB/T 7714	Guo Z.,Shen W.. Formulation of a Triaxial Three-Layered Earth Rotation: Theory and Rotational Normal Mode Solutions[J],2020,125(3).
APA	Guo Z.,&Shen W..(2020).Formulation of a Triaxial Three-Layered Earth Rotation: Theory and Rotational Normal Mode Solutions.Journal of Geophysical Research: Solid Earth,125(3).
MLA	Guo Z.,et al."Formulation of a Triaxial Three-Layered Earth Rotation: Theory and Rotational Normal Mode Solutions".Journal of Geophysical Research: Solid Earth 125.3(2020).