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Layered mantle convection: A model for geoid and topography

Wen, Lianxing and Anderson, Don L. (1997) Layered mantle convection: A model for geoid and topography. Earth and Planetary Science Letters, 146 (3-4). pp. 367-377. ISSN 0012-821X. http://resolver.caltech.edu/CaltechAUTHORS:20121010-082637042

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Abstract

The long-wavelength geoid and topography are dynamic effects of a convecting mantle. The long-wavelength geoid of the Earth is controlled by density variations in the mantle and has been explained by circulation models involving whole mantle flow. However, the relationship of long-wavelength topography to mantle circulation has been a puzzling problem in geodynamics. We show that the dynamic topography is mainly due to density variations in the upper mantle, even after the effects of lithospheric cooling and crustal thickness variation are taken into account. Layered mantle convection, with a shallow origin for surface dynamic topography, is consistent with the spectrum, small amplitude and pattern of the topography. Layered mantle convection, with a barrier about 250 km deeper than the 670 km phase boundary, provides a self-consistent geodynamic model for the amplitude and pattern of both the long-wavelength geoid and surface topography.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/ 10.1016/S0012-821X(96)00238-5DOIUNSPECIFIED
http://www.sciencedirect.com/science/article/pii/S0012821X96002385PublisherUNSPECIFIED
Additional Information:© 1997 Elsevier Science B.V. Received 28 May 1996; accepted 4 October 1996. We thank Anny Cazenave for the residual topography data, Scott King for the viscosity structure and Michael Gurnis, David Stevenson and Craig Scrivner for reviews. This work was funded by NSF grant EAR 92-18390. Contribution No. 5598, Division of Geological and Planetary Sciences, California Institute of Technology. [RV]
Funders:
Funding AgencyGrant Number
NSFEAR 92-18390
Subject Keywords:geoid; topography; mantle; convection
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Caltech Division of Geological and Planetary Sciences5598
Record Number:CaltechAUTHORS:20121010-082637042
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20121010-082637042
Official Citation:Lianxing Wen, Don L. Anderson, Layered mantle convection: A model for geoid and topography, Earth and Planetary Science Letters, Volume 146, Issues 3–4, February 1997, Pages 367-377, ISSN 0012-821X, 10.1016/S0012-821X(96)00238-5. (http://www.sciencedirect.com/science/article/pii/S0012821X96002385)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34808
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:10 Oct 2012 16:34
Last Modified:10 Oct 2012 16:34

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