气候变化领域集成服务门户(CCPortal): Earth’s multi-scale topographic response to global mantle flow

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DOI	10.1038/s41561-019-0441-4
	Earth’s multi-scale topographic response to global mantle flow
	Davies D.R.; Valentine A.P.; Kramer S.C.; Rawlinson N.; Hoggard M.J.; Eakin C.M.; Wilson C.R.
发表日期	2019
ISSN	17520894
卷号	12 期号:10
英文摘要	Earth’s surface topography is a direct physical expression of our planet’s dynamics. Most is isostatic, controlled by thickness and density variations within the crust and lithosphere, but a substantial proportion arises from forces exerted by underlying mantle convection. This dynamic topography directly connects the evolution of surface environments to Earth’s deep interior, but predictions from mantle flow simulations are often inconsistent with inferences from the geological record, with little consensus about its spatial pattern, wavelength and amplitude. Here, we demonstrate that previous comparisons between predictive models and observational constraints have been biased by subjective choices. Using measurements of residual topography beneath the oceans, and a hierarchical Bayesian approach to performing spherical harmonic analyses, we generate a robust estimate of Earth’s oceanic residual topography power spectrum. This indicates water-loaded power of 0.5 ± 0.35 km2 and peak amplitudes of up to ~0.8 ± 0.1 km at long wavelengths (~104 km), decreasing by roughly one order of magnitude at shorter wavelengths (~103 km). We show that geodynamical simulations can be reconciled with observational constraints only if they incorporate lithospheric structure and its impact on mantle flow. This demonstrates that both deep (long-wavelength) and shallow (shorter-wavelength) processes are crucial, and implies that dynamic topography is intimately connected to the structure and evolution of Earth’s lithosphere. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	amplitude; crust-mantle boundary; geodynamics; global perspective; lithospheric structure; magnitude; spatial analysis; topography; wavelength
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/124587
作者单位	Research School of Earth Sciences, The Australian National University, Canberra, Australia; Department of Earth Science and Engineering, Imperial College London, London, United Kingdom; Department of Earth Sciences-Bullard Labs, University of Cambridge, Cambridge, United Kingdom; Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States; Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC, United States
推荐引用方式 GB/T 7714	Davies D.R.,Valentine A.P.,Kramer S.C.,等. Earth’s multi-scale topographic response to global mantle flow[J],2019,12(10).
APA	Davies D.R..,Valentine A.P..,Kramer S.C..,Rawlinson N..,Hoggard M.J..,...&Wilson C.R..(2019).Earth’s multi-scale topographic response to global mantle flow.Nature Geoscience,12(10).
MLA	Davies D.R.,et al."Earth’s multi-scale topographic response to global mantle flow".Nature Geoscience 12.10(2019).