A numerical study of the effects of boundary conditions on mantle convection models constrained to fit the low degree geoid coefficients

Fu Rong-Shan (1986) A numerical study of the effects of boundary conditions on mantle convection models constrained to fit the low degree geoid coefficients. Physics of the Earth and Planetary Interiors, 44 3: 257-263. doi:10.1016/0031-9201(86)90074-9


Author Fu Rong-Shan
Title A numerical study of the effects of boundary conditions on mantle convection models constrained to fit the low degree geoid coefficients
Journal name Physics of the Earth and Planetary Interiors   Check publisher's open access policy
ISSN 0031-9201
Publication date 1986
Sub-type Article (original research)
DOI 10.1016/0031-9201(86)90074-9
Volume 44
Issue 3
Start page 257
End page 263
Total pages 7
Subject 1908 Geophysics
1912 Space and Planetary Science
3101 Physics and Astronomy (miscellaneous)
3103 Astronomy and Astrophysics
1900 Earth and Planetary Sciences
2300 Environmental Science
Abstract A simple mathematical model is set up to study the effects on the mantle convection pattern of boundary conditions at the core-mantle boundary and at the surface (or the lithosphere-asthenosphere boundary). Uniform viscosity and homogeneous heat source are assumed and the density differences driving convection and the associated boundary undulations are constrained to fit the observed low degree geoid coefficients. The most important conclusion is that when the Rayleigh number is around 1.4-1.8 times the critical Rayleigh number at degree 2, a model having a free lower boundary and a frictional upper boundary gives plate motions strongly disagreeing with the observed motions, but a model with a free upper boundary and frictional lower boundary agrees better with the global tectonic features. In this case the frictional lower boundary is considered to represent increasing viscosity with depth, which is not formally included in the model. The correlation between convergent zones of the calculated convection pattern and the subducting slabs indicates that the slabs provide the most plausible driving mechanism of the plate motions.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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Created: Tue, 14 Jun 2016, 06:17:18 EST by System User