Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1038/s41467-020-16888-0 |
Rapid geomagnetic changes inferred from Earth observations and numerical simulations | |
Davies, Christopher J.1; Constable, Catherine G.2 | |
2020-07-06 | |
发表期刊 | NATURE COMMUNICATIONS
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ISSN | 2041-1723 |
出版年 | 2020 |
卷号 | 11期号:1 |
文章类型 | Article |
语种 | 英语 |
国家 | England; USA |
英文摘要 | Extreme variations in the direction of Earth's magnetic field contain important information regarding the operation of the geodynamo. Paleomagnetic studies have reported rapid directional changes reaching 1 degrees yr(-1), although the observations are controversial and their relation to physical processes in Earth's core unknown. Here we show excellent agreement between amplitudes and latitude ranges of extreme directional changes in a suite of geodynamo simulations and a recent observational field model spanning the past 100 kyrs. Remarkably, maximum rates of directional change reach similar to 10 degrees yr(-1), typically during times of decreasing field strength, almost 100 times faster than current changes. Detailed analysis of the simulations and a simple analogue model indicate that extreme directional changes are associated with movement of reversed flux across the core surface. Our results demonstrate that such rapid variations are compatible with the physics of the dynamo process and suggest that future searches for rapid directional changes should focus on low latitudes. |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000550670400006 |
WOS关键词 | SECULAR VARIATION ; SULMONA BASIN ; OUTER-CORE ; FIELD ; SPIKES ; STRATIFICATION ; REAPPRAISAL ; CENTURIES ; REVERSAL ; RECORDS |
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/282724 |
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, La Jolla, CA 92093 USA |
推荐引用方式 GB/T 7714 | Davies, Christopher J.,Constable, Catherine G.. Rapid geomagnetic changes inferred from Earth observations and numerical simulations[J]. NATURE COMMUNICATIONS,2020,11(1). |
APA | Davies, Christopher J.,&Constable, Catherine G..(2020).Rapid geomagnetic changes inferred from Earth observations and numerical simulations.NATURE COMMUNICATIONS,11(1). |
MLA | Davies, Christopher J.,et al."Rapid geomagnetic changes inferred from Earth observations and numerical simulations".NATURE COMMUNICATIONS 11.1(2020). |
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