气候变化领域集成服务门户(CCPortal): A numerical study of thermal and chemical structures at the core-mantle boundary

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DOI	10.1016/j.epsl.2020.116498
	A numerical study of thermal and chemical structures at the core-mantle boundary
	Stein C.; Mertens M.; Hansen U.
发表日期	2020
ISSN	0012821X
卷号	548
英文摘要	The core-mantle boundary (CMB) represents the lower boundary layer of the actively convecting Earth's mantle and is structurally very complex. Thermal and chemical structures such as thermal plumes and thermochemical piles have been considered to explain the complexities. Both affect the dynamics of the Earth's mantle and its temporal evolution. But also the surface plates are an essential aspect of mantle convection that strongly influence the dynamics of the interior. We use numerical thermochemical models of mantle convection to study the structure and dynamics of the lowermost mantle. Our approach allows for the investigation of plumes and piles in combination with plate-like surface motion and deep subduction. The models show that the presence of a dense CMB layer generally reduces the mobility of the surface plates but that during plate evolution a variety of plume classes occur leaving a complex structure at the CMB. The CMB topography shows large elevated areas with sharp edges and a flat or slightly dented top for piles with plumes atop. Also, plume clusters can cause large elevated areas with sharp edges but a flat top with a few smaller peaks. Smaller-scale patterns, often close to the edges of the large structures cause smaller peaks in CMB topography and can be explained by either line-plumes or wind-driven thermals. The latter often arise when heat is trapped beneath subducted slabs that spread over the CMB. © 2020 The Authors
关键词	convection modelling core-mantle boundary LLSVP topography ULVZ
英文关键词	Boundary layers; Piles; Structural geology; Structure (composition); Topography; Complex structure; Core-mantle boundary; Large structures; Lowermost mantle; Mantle convection; Structure and dynamics; Temporal evolution; Thermochemical models; Plates (structural components); chemical composition; core-mantle boundary; mantle convection; mantle plume; numerical model; subduction; temperature anomaly
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202907
作者单位	Institut f. Geophysik, Westfälische Wilhelms-Universität, Corrensstr. 24, Münster, Germany; Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Institut f. Physik der Atmosphäre, Oberpfaffenhofen, Germany
推荐引用方式 GB/T 7714	Stein C.,Mertens M.,Hansen U.. A numerical study of thermal and chemical structures at the core-mantle boundary[J],2020,548.
APA	Stein C.,Mertens M.,&Hansen U..(2020).A numerical study of thermal and chemical structures at the core-mantle boundary.Earth and Planetary Science Letters,548.
MLA	Stein C.,et al."A numerical study of thermal and chemical structures at the core-mantle boundary".Earth and Planetary Science Letters 548(2020).