DOI: 10.1002/2016GL067929
论文题名: On the ratio of dynamic topography and gravity anomalies in a dynamic Earth
作者: Colli L. ; Ghelichkhan S. ; Bunge H.-P.
刊名: Geophysical Research Letters
ISSN: 0094-9204
EISSN: 1944-8935
出版年: 2016
卷: 43, 期: 6 起始页码: 2510
结束页码: 2516
语种: 英语
英文关键词: Dynamic topography
; Gravity anomalies
; Mantle convection
Scopus关键词: Geometry
; Gravitation
; Surface topography
; Tectonics
; Topography
; Dynamic topography
; Earth models
; Gravity anomalies
; Long wavelength
; Mantle convection
; Surface deflection
; Surface height
; Viscous stress
; Planetary surface analysis
; analytical method
; dynamic response
; equilibrium
; gravity anomaly
; isostasy
; mantle convection
; prediction
; topography
; viscosity
; wavelength
英文摘要: Growing evidence from a variety of geologic indicators points to significant topography maintained convectively by viscous stresses in the mantle. However, while gravity is sensitive to dynamically supported topography, there are only small free-air gravity anomalies (<30 mGal) associated with Earth's long-wavelength topography. This has been used to suggest that surface heights computed assuming a complete isostatic equilibrium provide a good approximation to observed topography. Here we show that the apparent paradox is resolved by the well-established formalism of global, self-gravitating, viscously stratified Earth models. The models predict a complex relation between dynamic topography, mass, and gravity anomalies that is not summarized by a constant admittance - i.e., ratio of gravity anomalies to surface deflections - as one would infer from analytic flow solutions formulated in a half-space. Our results suggest that sizable dynamic topography may exist without a corresponding gravity signal. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84977959680&doi=10.1002%2f2016GL067929&partnerID=40&md5=ed91488b5fca6ad538b69e6db5103b4e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10167
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.,Ghelichkhan S.,Bunge H.-P.. On the ratio of dynamic topography and gravity anomalies in a dynamic Earth[J]. Geophysical Research Letters,2016-01-01,43(6).