| DOI: | 10.1002/2015GL065700
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| 论文题名: | Dipole fluctuations and the duration of geomagnetic polarity transitions |
| 作者: | Buffett B.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9482
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| EISSN: | 1944-9213
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| 出版年: | 2015
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| 卷: | 42, 期:18 | | 起始页码: | 7444
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| 结束页码: | 7451
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| 语种: | 英语
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| 英文关键词: | geomagnetic reversals
; magnetic intensity
; stochastic model
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| Scopus关键词: | Geomagnetism
; Magnetism
; Recovery
; Stochastic models
; Stochastic systems
; Axial dipole
; Convective velocity
; General trends
; Geomagnetic polarity transition
; geomagnetic reversals
; Magnetic intensities
; Recovery time
; Time-averaged
; Magnetic polarity
; convective system
; field method
; geomagnetic field
; magnetic intensity
; magnetic reversal
; stochasticity
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| 英文摘要: | Geomagnetic polarity transitions are often accompanied by a decrease in magnetic intensity. The time required to reestablish the magnetic intensity after a transition is usually longer than the duration based on magnetic direction. Analysis of the paleomagnetic axial dipole moment from the PADM2M model shows a return to the time-averaged intensity after 42 kyr. A shorter time is required to recover a fraction of the time-averaged moment, but the correspondence between recovery time and fraction of recovery is nonlinear. Predictions of a stochastic model reproduce the general trends in recovery time and suggest that fluctuations in dipole generation increase substantially during polarity transitions relative to times of stable polarity. These large fluctuations could reflect larger convective velocities in the core or represent a change in the efficiency of dipole generation. In either case, large fluctuations during polarity transitions can flip the sign of the axial dipole field several times before a polarity transition is completed. © 2015 American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84945217286&doi=10.1002%2f2015GL065700&partnerID=40&md5=a45e4e4069ca925dd2cebb3695d707b3
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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/9097
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Department of Earth and Planetary Science, University of California, Berkeley, CA, United States
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| Recommended Citation: | |
Buffett B.. Dipole fluctuations and the duration of geomagnetic polarity transitions[J]. Geophysical Research Letters,2015-01-01,42(18).
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