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

	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
	Chen, Wei 1,2; Ray, Jim 3; Li, JianCheng 1; Huang, ChengLi4 ; Shen, WenBin 1
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
	2013-09-01
卷号	118 期号:9 页码:4975-4994
关键词	Earth rotation theory frequency-dependent response mantle anelasticity quasi-fluid rheology ocean pole tides Chandler wobble
英文摘要	This study aims to improve the polar motion theory by developing refined frequency-dependent transfer functions with the most current models for ocean tides, the Earth's rheology, and core-mantle coupling. First, we present a power law for mantle anelasticity constrained by the Chandler period T-CW and quality factor Q(CW) and an empirical quasi-fluid rheology model with a linear dependence on frequency, which is suitable for a period as long as similar to 18.6 years. Then we adopt the diurnal ocean tides from the International Earth Rotation and Reference Systems Service Conventions (2010), the long-period ocean model of Dickman and Gross (2010), and the equilibrium ocean pole tide model of Desai (2002) to calculate the oceanic corrections to the Love numbers. Further, we present discussions on the geophysical and observational aspects of the Chandler period TCW and quality factor Q(CW), and provide preferred values and intervals for T-CW and Q(CW), which allow us to place some constraints on the mantle anelasticity and core-mantle coupling ratio (CW). Although (CW) is affected by uncertainties in T-CW and Q(CW), we find its real part should be around 2%-3% while its imaginary part might be only a few thousandths. Finally, the frequency-dependent polar motion transfer functions T-L and T-NL are determined based on the models of frequency-dependent Love numbers and core-mantle coupling discussed above. Our transfer functions are related to the values of T-CW and Q(CW), however, our analyses demonstrate that our transfer functions are rather stable and not sensitive to perturbations in T-CW and Q(CW).
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Geochemistry & Geophysics
研究领域[WOS]	Geochemistry & Geophysics
关键词[WOS]	CHANDLER-WOBBLE ; OCEAN TIDES ; ANGULAR-MOMENTUM ; FORCED NUTATIONS ; ROTATION ; PERIOD ; DEFORMATION ; ORIENTATION ; ATMOSPHERE ; RESONANCE
收录类别	SCI
语种	英语
WOS记录号	WOS:000325553000020
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/18050]
专题	上海天文台_天文地球动力学研究中心
作者单位	1.Wuhan Univ, Sch Geodesy & Geomat, Key Lab Geospace Environm & Geodesy, Wuhan 430079, Hubei, Peoples R China 2.Chinese Acad Sci, Inst Geodesy & Geophys, State Key Lab Geodesy & Earths Dynam, Wuhan, Peoples R China 3.NOAA, Silver Spring, MD USA 4.Chinese Acad Sci, Shanghai Astron Observ, Shanghai, Peoples R China
推荐引用方式 GB/T 7714	Chen, Wei,Ray, Jim,Li, JianCheng,et al. 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]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2013,118(9):4975-4994.
APA	Chen, Wei,Ray, Jim,Li, JianCheng,Huang, ChengLi,&Shen, WenBin.(2013).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.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,118(9),4975-4994.
MLA	Chen, Wei,et al."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".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 118.9(2013):4975-4994.