气候变化领域集成服务门户(CCPortal): The Earth’s core as a reservoir of water

CCPortal

DOI	10.1038/s41561-020-0578-1
	The Earth’s core as a reservoir of water
	Li Y.; Vočadlo L.; Sun T.; Brodholt J.P.
发表日期	2020
ISSN	17520894
起始页码	453
结束页码	458
卷号	13 期号:6
英文摘要	Current estimates of the budget and distribution of water in the Earth have large uncertainties, most of which are due to the lack of information about the deep Earth. Recent studies suggest that the Earth could have gained a considerable amount of water during the early stages of its evolution from the hydrogen-rich solar nebula, and that a large amount of the water in the Earth may have partitioned into the core. Here we calculate the partitioning of water between iron and silicate melts at 20–135 GPa and 2,800–5,000 K, using ab initio molecular dynamics and thermodynamic integration techniques. Our results indicate a siderophile nature of water at core–mantle differentiation and core–mantle boundary conditions, which weakens with increasing temperature; nevertheless, we found that water always partitions strongly into the iron liquid under core-formation conditions for both reducing and oxidizing scenarios. The siderophile nature of water was also verified by an empirical-counting method that calculates the distribution of hydrogen in an equilibrated iron and silicate melt. We therefore conclude that the Earth’s core may act as a large reservoir that contains most of the Earth’s water. In addition to constraining the accretion models of volatile delivery, the findings may partially account for the low density of the Earth’s core implied by measured seismic velocities. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	high temperature; hydrogen; iron; oxidation; reduction; seismic velocity; siderophore; silicate melt; thermodynamics; water budget
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206806
作者单位	Department of Earth Sciences, University College London, London, United Kingdom; Key Laboratory of Computational Geodynamics, College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China; Centre for Earth Evolution and Dynamics, University of Oslo, Oslo, Norway
推荐引用方式 GB/T 7714	Li Y.,Vočadlo L.,Sun T.,等. The Earth’s core as a reservoir of water[J],2020,13(6).
APA	Li Y.,Vočadlo L.,Sun T.,&Brodholt J.P..(2020).The Earth’s core as a reservoir of water.Nature Geoscience,13(6).
MLA	Li Y.,et al."The Earth’s core as a reservoir of water".Nature Geoscience 13.6(2020).