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Deformation of the core-mantle boundary induced by spherical-shell, compressible convectionSingle-mode, mean-field equations, for spherical-shell convection are derived, with variable viscosity and compressibility included. Core-mantle boundary (CMB) topography produced by whole mantle convection is computed for various rheologies and different thermal boundary conditions at CMB. Results for long-wavelength undulations show the extreme sensitivity of these signatures to rheological and equation of state parameters. In order to obtain excess ellipticity of about 1 km, the activation energy and volume in the lower mantle should be low, and the temperatures at CMB should be around 4500 K, in accord with recent experimental findings.
Document ID
19880025655
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Zhang, Shuxia
(Minnesota Univ. Minneapolis, MN, United States)
Yuen, David A.
(Minnesota, University Minneapolis, United States)
Date Acquired
August 13, 2013
Publication Date
September 1, 1987
Publication Information
Publication: Geophysical Research Letters
Volume: 14
ISSN: 0094-8276
Subject Category
Geophysics
Accession Number
88A12882
Funding Number(s)
CONTRACT_GRANT: NAG5-770
Distribution Limits
Public
Copyright
Other

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