DOI: 10.1002/grl.50574
论文题名: Implications of high core thermal conductivity on Earth's coupled mantle and core evolution
作者: Nakagawa T. ; Tackley P.J.
刊名: Geophysical Research Letters
ISSN: 0094-8928
EISSN: 1944-8659
出版年: 2013
卷: 40, 期: 11 起始页码: 2652
结束页码: 2656
语种: 英语
英文关键词: CMB heat flow
; compositional convection
; magnetic dissipation
; mantle convection
; thermal conductivity
Scopus关键词: Adiabatic heats
; Core-mantle boundary
; Coupled models
; Gravitational energy
; High thermal conductivity
; Inner core growth
; Magnetic dissipation
; Mantle convection
; Computer simulation
; Heat flux
; Heat transfer
; Thermal conductivity
; core-mantle boundary
; dissipation
; geodynamo
; heat balance
; latent heat flux
; mantle convection
; thermal conductivity
; Calluna vulgaris
英文摘要: We assess the effect of high thermal conductivity of Earth's core, which was recently determined to be 2-3 times higher than previously thought, on Earth's thermochemical-magnetic evolution using a coupled model of simulated mantle convection and parameterized core heat balance, following the best fit case of Nakagawa and Tackley (2010). The value of core thermal conductivity has no effect on mantle evolution. The core-mantle boundary heat flow starts high and decreases with time to ∼13 TW, which is below the core adiabatic heat flux for the largest thermal conductivity tested (200 W/m/K), meaning that a purely thermal dynamo is not viable. However, gravitational energy release and latent heat associated with inner core growth become important in the last ∼0.9 Gyr and allow continuous geodynamo generation despite high core thermal conductivity, although we estimate a subadiabatic region at the top of the core of the order of hundreds of kilometers. © 2013 American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84879963554&doi=10.1002%2fgrl.50574&partnerID=40&md5=bf191b949cdba3fb08c95323a4b48634
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6192
Appears in Collections: 气候减缓与适应
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作者单位: Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Yokohama, 236-0001, Japan
Recommended Citation:
Nakagawa T.,Tackley P.J.. Implications of high core thermal conductivity on Earth's coupled mantle and core evolution[J]. Geophysical Research Letters,2013-01-01,40(11).