Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1038/s41467-018-05738-9 |
Geomagnetic spikes on the core-mantle boundary | |
Davies, Christopher1,2; Constable, Catherine2 | |
2017-05-30 | |
发表期刊 | NATURE COMMUNICATIONS
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ISSN | 2041-1723 |
出版年 | 2017 |
卷号 | 8 |
文章类型 | Article |
语种 | 英语 |
国家 | England; USA |
英文摘要 | Extreme variations of Earth's magnetic field occurred in the Levant region around 1000 BC, when the field intensity rapidly rose and fell by a factor of 2. No coherent link currently exists between this intensity spike and the global field produced by the core geodynamo. Here we show that the Levantine spike must span >60 degrees longitude at Earth's surface if it originates from the core-mantle boundary (CMB). Several low intensity data are incompatible with this geometric bound, though age uncertainties suggest these data could have sampled the field before the spike emerged. Models that best satisfy energetic and geometric constraints produce CMB spikes 8-22 degrees wide, peaking at O(100) mT. We suggest that the Levantine spike reflects an intense CMB flux patch that grew in place before migrating northwest, contributing to growth of the dipole field. Estimates of Ohmic heating suggest that diffusive processes likely govern the ultimate decay of geomagnetic spikes. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000402302700001 |
WOS关键词 | EARTHS CORE ; MAGNETIC-FIELD ; SECULAR VARIATION ; TORSIONAL WAVES ; SPHERICAL-SHELL ; OUTER-CORE ; INTENSITY ; CONSTRAINTS ; CONVECTION ; NUTATION |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/203948 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England; 2.Univ Calif San Diego, Inst Geophys & Planetary Phys, Scripps Inst Oceanog, 9500 Gilman Dr, La Jolla, CA 92093 USA |
推荐引用方式 GB/T 7714 | Davies, Christopher,Constable, Catherine. Geomagnetic spikes on the core-mantle boundary[J]. NATURE COMMUNICATIONS,2017,8. |
APA | Davies, Christopher,&Constable, Catherine.(2017).Geomagnetic spikes on the core-mantle boundary.NATURE COMMUNICATIONS,8. |
MLA | Davies, Christopher,et al."Geomagnetic spikes on the core-mantle boundary".NATURE COMMUNICATIONS 8(2017). |
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