| DOI: | 10.1002/2016GL068858
|
| 论文题名: | Simulating 2 Ga of geodynamo history |
| 作者: | Driscoll P.E.
|
| 刊名: | Geophysical Research Letters
|
| ISSN: | 0094-8963
|
| EISSN: | 1944-8694
|
| 出版年: | 2016
|
| 卷: | 43, 期:11 | | 起始页码: | 5680
|
| 结束页码: | 5687
|
| 语种: | 英语
|
| 英文关键词: | core evolution
; Earth history
; geodynamo
; paleogeography
; paleomagnetism
|
| Scopus关键词: | Gallium
; Geomagnetism
; Nucleation
; Core evolution
; Geodynamo
; Numerical dynamos
; Paleogeography
; Paleomagnetic record
; Paleomagnetism
; Reversal behavior
; Thermal evolution
; Geochronology
|
| 英文摘要: | The paleomagnetic record indicates the geodynamo has been active over much of Earth history with surprisingly little trend in paleointensity. Variability, however, is expected from models that predict a sharp increase in intensity following inner core nucleation (ICN) and implied by Neoproterozoic anomalies that hint at a highly variable field over several hundred million years. Here we demonstrate with a suite of numerical dynamos driven by a new thermal evolution model that the geodynamo could have transitioned from a multipolar to dipolar regime around 1.7 Ga, then to a weak-field dynamo around 1.0 Ga, and finally to a strong-field dipole following ICN around 650 Ma that is maintained to the present day. The occurrence of a weak-field geodynamo in the Neoproterozoic may be consistent with the observed anomalous apparent polar wander paths and reversal behavior. Recovery to a dipolar geodynamo in the Phanerozoic could be a signature of inner core nucleation. Index terms: 1507, 1560, and 1521. ©2016. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84973442688&doi=10.1002%2f2016GL068858&partnerID=40&md5=f191cbc5674615faa2a8f246789016d7
|
| Citation statistics: |
|
| 资源类型: | 期刊论文
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/9926
|
| Appears in Collections: | 科学计划与规划
气候变化与战略
|
|
There are no files associated with this item.
|
|
作者单位: | Department of Terrestrial Magnetism, Carnegie Institution for Science, Washington, DC, United States
|
| Recommended Citation: | |
Driscoll P.E.. Simulating 2 Ga of geodynamo history[J]. Geophysical Research Letters,2016-01-01,43(11).
|
|
|