Deformation of the core‐mantle boundary induced by spherical‐shell, compressible convection

Shuxia Zhang, David A. Yuen

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

We derive the single‐mode, mean‐field equations for spherical‐shell convection 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 around 4,500 K, in accord with recent experimental findings.

Original languageEnglish (US)
Pages (from-to)899-902
Number of pages4
JournalGeophysical Research Letters
Volume14
Issue number9
DOIs
StatePublished - Sep 1987

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