| DOI: | 10.1002/2014GL059836
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| 论文题名: | The strength of gravitational core-mantle coupling |
| 作者: | Davies C.J.; Stegman D.R.; Dumberry M.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-10606
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| EISSN: | 1944-10337
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| 出版年: | 2014
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| 卷: | 41, 期:11 | | 起始页码: | 3786
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| 结束页码: | 3792
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| 语种: | 英语
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| 英文关键词: | core-mantle coupling
; inner core rotation
; inner core viscosity
; variations in length of day
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| Scopus关键词: | Geophysics
; Core-mantle
; Core-mantle boundary
; Density anomalies
; Earth's core
; Inner core
; Inner-core rotation
; Length of days
; Seismic tomography
; Earth sciences
; angular momentum
; core-mantle boundary
; ellipse
; estimation method
; geoid
; gravity field
; inner core
; seismic wave
; uncertainty analysis
; viscous flow
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| 英文摘要: | Gravitational coupling between Earth's core and mantle has been proposed as an explanation for a 6 year variation in the length-of-day (ΔLOD) signal and plays a key role in the possible superrotation of the inner core. Explaining the observations requires that the strength of the coupling, Γ, falls within fairly restrictive bounds; however, the value of Γ is highly uncertain because it depends on the distribution of mass anomalies in the mantle. We estimate Γ from a broad range of viscous mantle flow models with density anomalies inferred from seismic tomography. Requiring models to give a correlation larger than 70% to the surface geoid and match the dynamic core-mantle boundary ellipticity inferred from Earth's nutations, we find that 3 × 1019<Γ<2 × 1020 N m, too small to explain the 6 year ΔLOD signal. This new constraint on Γ has important implications for core-mantle angular momentum transfer and on the preferred mode of inner core convection. © 2014. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84901731756&doi=10.1002%2f2014GL059836&partnerID=40&md5=eff87cfa943a69c2d9bce51725043f71
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/7870
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| Appears in Collections: | 气候减缓与适应
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作者单位: | School of Earth and Environment, University of Leeds, Leeds, United Kingdom
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| Recommended Citation: | |
Davies C.J.,Stegman D.R.,Dumberry M.. The strength of gravitational core-mantle coupling[J]. Geophysical Research Letters,2014-01-01,41(11).
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