| DOI: | 10.1002/2014GL061818
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| 论文题名: | Could giant basin-forming impacts have killed Martian dynamo? |
| 作者: | Kuang W.; Jiang W.; Roberts J.; Frey H.V.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9582
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| EISSN: | 1944-9313
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| 出版年: | 2014
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| 卷: | 41, 期:22 | | 起始页码: | 8006
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| 结束页码: | 8012
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| 语种: | 英语
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| 英文关键词: | giant impacts
; Martian dynamo
; numerical simulation
; thermal heterogeneity
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| Scopus关键词: | Computer simulation
; Numerical models
; Core-mantle boundary
; Crustal magnetization
; Giant impact
; Higher latitudes
; Impact basins
; Remagnetization
; Surface of Mars
; Thermal heterogeneity
; Interactive devices
; core-mantle boundary
; crust
; heterogeneity
; magnetization
; Mars
; Martian atmosphere
; numerical model
; temperature effect
; Mazowieckie
; Poland
; Utrata Valley
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| 英文摘要: | The observed strong remanent crustal magnetization at the surface of Mars suggests an active dynamo in the past and ceased to exist around early to middle Noachian era, estimated by examining remagnetization strengths in extant and buried impact basins. We investigate whether the Martian dynamo could have been killed by these large basin-forming impacts, via numerical simulation of subcritical dynamos with impact-induced thermal heterogeneity across the core-mantle boundary. We find that subcritical dynamos are prone to the impacts centered on locations within 30° of the equator but can easily survive those at higher latitudes. Our results further suggest that magnetic timing places a strong constraint on postimpact polar reorientation, e.g., a minimum 16° polar reorientation is needed if Utopia is the dynamo killer. © 2014. The Authors. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84923364322&doi=10.1002%2f2014GL061818&partnerID=40&md5=6419065632ff56de2a285f17af802eb3
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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/6846
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Planetary Geodynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, United States
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| Recommended Citation: | |
Kuang W.,Jiang W.,Roberts J.,et al. Could giant basin-forming impacts have killed Martian dynamo?[J]. Geophysical Research Letters,2014-01-01,41(22).
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