DOI: 10.1002/2015GL066001
论文题名: On retrodictions of global mantle flow with assimilated surface velocities
作者: Colli L. ; Bunge H.-P. ; Schuberth B.S.A.
刊名: Geophysical Research Letters
ISSN: 0094-9571
EISSN: 1944-9302
出版年: 2015
卷: 42, 期: 20 起始页码: 8341
结束页码: 8348
语种: 英语
英文关键词: chaos
; data assimilation
; Lyapunov exponent
; mantle convection
; plate motion history
; surface velocities
Scopus关键词: Chaos theory
; Lyapunov methods
; Repair
; Tectonics
; Data assimilation
; Lyapunov exponent
; Mantle convection
; Plate motions
; Surface velocity
; Velocity
; chaotic dynamics
; data assimilation
; mantle convection
; overturn
; plate motion
; reconstruction
; subsidence
; temperature
; uplift
; velocity profile
英文摘要: Modeling past states of Earth's mantle and relating them to geologic observations such as continental-scale uplift and subsidence is an effective method for testing mantle convection models. However, mantle convection is chaotic and two identical mantle models initialized with slightly different temperature fields diverge exponentially in time until they become uncorrelated, thus limiting retrodictions (i.e., reconstructions of past states of Earth's mantle obtained using present information) to the recent past. We show with 3-D spherical mantle convection models that retrodictions of mantle flow can be extended significantly if knowledge of the surface velocity field is available. Assimilating surface velocities produces in some cases negative Lyapunov times (i.e., e-folding times), implying that even a severely perturbed initial condition may evolve toward the reference state. A history of the surface velocity field for Earth can be obtained from past plate motion reconstructions for time periods of a mantle overturn, suggesting that mantle flow can be reconstructed over comparable times. Key Points Long-term retrodictions of mantle convection are hindered by chaotic drift Reconstructions of past plate motion provide fundamental information about mantle flow in the past Assimilation of past plate motion data greatly improves long-term retrodictions of mantle convection © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84946615772&doi=10.1002%2f2015GL066001&partnerID=40&md5=8948aaa9b3f87696dff0b59f13ca4770
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9186
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Earth and Environmental Sciences, University of Munich, Munich, Germany
Recommended Citation:
Colli L.,Bunge H.-P.,Schuberth B.S.A.. On retrodictions of global mantle flow with assimilated surface velocities[J]. Geophysical Research Letters,2015-01-01,42(20).