globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.116852
Title:
Constraints on the thermal evolution of Earth's core from ab initio calculated transport properties of FeNi liquids
Author: Li W.-J.; Li Z.; He X.-T.; Wang C.; Zhang P.
Source Publication: Earth and Planetary Science Letters
ISSN: 0012821X
Publishing Year: 2021
Volume: 562
Language: 英语
keyword in Chinese: ab initio molecular dynamics ; inner core age ; thermal conductivity ; thermal stratification
Keyword: Binary alloys ; Calculations ; Iron ; Iron alloys ; Liquids ; Molecular dynamics ; Nickel ; Temperature ; Thermal conductivity ; Ab initio ; Ab initio molecular dynamics ; Earth magnetic fields ; Earths cores ; Inner core ; Inner core age ; Property ; Thermal ; Thermal evolution ; Thermal stratification ; computer simulation ; electrical conductivity ; inner core ; iron ; molecular analysis ; nickel ; outer core ; stratification ; temperature gradient ; thermal conductivity
English Abstract: Earth's magnetic field is generated by the liquid outer core and sensitively depends on the thermal conductivity of the core. The dominant component of the Earth's core is Fe (∼85%) and Ni (∼10%). However, current estimates on FeNi liquids have not been previously tested at high pressures. In this paper, ab initio simulations were first applied to calculations of the thermal and electrical conductivities of FeNi liquids at Earth's outer core conditions. The thermal conductivity along the adiabatic curve for FeNi fluid ranges from 120.52 to 202.80 W/m/K, but pure Fe ranges from 125.07 to 216.18 W/m/K. The age of the inner core calculated with thermal conductivity of FeNi fluid is 0.019 Ga longer than pure Fe. Nickel effect on the age of the inner core is of the same order with the uncertainty of density jump and latent heat at the inner-core boundary. Furthermore, by analyzing the effective temperature gradient, the present thickness of thermal stratification calculated with thermal conductivity of FeNi liquid is 64.5 km thinner than that of pure Fe. © 2021
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被引频次[WOS]:7   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Identifier: http://119.78.100.158/handle/2HF3EXSE/165563
Appears in Collections:气候变化与战略

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Affiliation: Institute of Applied Physics and Computational Mathematics, Beijing, 100088, China; Center for Applied Physics and Technology, Peking University, Beijing, 100871, China

Recommended Citation:
Li W.-J.,Li Z.,He X.-T.,et al. Constraints on the thermal evolution of Earth's core from ab initio calculated transport properties of FeNi liquids[J]. Earth and Planetary Science Letters,2021-01-01,562
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