Lattice Thermal Conductivity of MgSiO3 Postperovskite Under the Lowermost Mantle Conditions From Ab Initio Anharmonic Lattice Dynamics

doi:10.1029/2019GL085273

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DOI	10.1029/2019GL085273
	Lattice Thermal Conductivity of MgSiO3 Postperovskite Under the Lowermost Mantle Conditions From Ab Initio Anharmonic Lattice Dynamics
	Dekura, Haruhiko 1; Tsuchiya, Taku 1,2
	2019-11-25
发表期刊	GEOPHYSICAL RESEARCH LETTERS
ISSN	0094-8276
EISSN	1944-8007
出版年	2019
卷号	46 期号:22 页码:12919-12926
文章类型	Article
语种	英语
国家	Japan
英文摘要	The lattice thermal conductivity (kappa(lat)) of MgSiO3 postperovskite (Mg-PPv) under the lowermost mantle pressure (P) and temperature (T) conditions was calculated using density functional theory combining anharmonic lattice dynamics theory. The kappa(lat) of Mg-PPv was found to be similar to 50% higher than that of MgSiO3 bridgmanite (Mg-Brg) owing to the larger phonon group velocity and lifetime. The lateral variation in the core-mantle boundary heat flux (q(CMB)) can be enhanced by the Brg-PPv phase transition. We also found that the kappa(lat) along the c axis of Mg-PPv is close to the conductivity of isotropic aggregate. This suggests that the effect of anisotropy in the kappa(lat) on q(CMB) would be minor if the transversely isotropic aggregate with the c axis vertical alignment, a potential source of seismic anisotropy in the D '' layer, is developed.
英文关键词	lower mantle ab initio calculation core-mantle boundary lattice thermal conductivity MgSiO3 postperovskite
领域	气候变化
收录类别	SCI-E
WOS记录号	WOS:000498353300001
WOS关键词	POST-PEROVSKITE ; HEAT-FLUX ; RADIATIVE CONDUCTIVITY ; PHASE-TRANSITION ; BOUNDARY-LAYER ; BRIDGMANITE ; ABSORPTION
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/225088
专题	环境与发展全球科技态势
作者单位	1.Ehime Univ, Geodynam Res Ctr, Matsuyama, Ehime, Japan; 2.Tokyo Inst Technol, Earth Life Sci Inst, Tokyo, Japan
推荐引用方式 GB/T 7714	Dekura, Haruhiko,Tsuchiya, Taku. Lattice Thermal Conductivity of MgSiO3 Postperovskite Under the Lowermost Mantle Conditions From Ab Initio Anharmonic Lattice Dynamics[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(22):12919-12926.
APA	Dekura, Haruhiko,&Tsuchiya, Taku.(2019).Lattice Thermal Conductivity of MgSiO3 Postperovskite Under the Lowermost Mantle Conditions From Ab Initio Anharmonic Lattice Dynamics.GEOPHYSICAL RESEARCH LETTERS,46(22),12919-12926.
MLA	Dekura, Haruhiko,et al."Lattice Thermal Conductivity of MgSiO3 Postperovskite Under the Lowermost Mantle Conditions From Ab Initio Anharmonic Lattice Dynamics".GEOPHYSICAL RESEARCH LETTERS 46.22(2019):12919-12926.