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| DOI | 10.1029/2020GL087715 |
| Scaling Laws for Regional Stratification at the Top of Earth's Core | |
| Mound J.E.; Davies C.J. | |
| 发表日期 | 2020 |
| ISSN | 0094-8276 |
| 卷号 | 47期号:16 |
| 英文摘要 | Seismic and geomagnetic observations have been used to argue both for and against a global stratified layer at the top of Earth's outer core. Recently, we used numerical models of turbulent thermal convection to show that imposed lateral variations in core-mantle boundary (CMB) heat flow can give rise to regional lenses of stratified fluid at the top of the core while the bulk of the core remains actively convecting. Here, we develop theoretical scaling laws to extrapolate the properties of regional stratified lenses measured in simulations to the conditions of Earth's core. We estimate that regional stratified lenses in Earth's core have thicknesses of up to a few hundred kilometres and Brunt-Väisälä frequencies of hours, consistent with independent observational constraints. The location, thickness, and strength of the stratified regions would change over geological time scales in response to the slowly evolving CMB heat flux heterogeneity imposed by mantle convection. ©2020. The Authors. |
| 英文关键词 | Geomagnetism; Heat flux; Core-mantle boundary; Geomagnetic observation; Lateral variations; Mantle convection; Stratified fluid; Stratified layers; Theoretical scaling law; Turbulent thermal convection; Heat convection; core-mantle boundary; geological time; geomagnetism; heat flow; heat flux; heterogeneity; seismic method; stratified fluid; thermal convection; turbulence; Calluna vulgaris |
| 语种 | 英语 |
| 来源期刊 | Geophysical Research Letters
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/169874 |
| 作者单位 | School of Earth and Environment, University of Leeds, Leeds, United Kingdom |
| 推荐引用方式 GB/T 7714 | Mound J.E.,Davies C.J.. Scaling Laws for Regional Stratification at the Top of Earth's Core[J],2020,47(16). |
| APA | Mound J.E.,&Davies C.J..(2020).Scaling Laws for Regional Stratification at the Top of Earth's Core.Geophysical Research Letters,47(16). |
| MLA | Mound J.E.,et al."Scaling Laws for Regional Stratification at the Top of Earth's Core".Geophysical Research Letters 47.16(2020). |
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