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Effects of depth-dependent thermal expansivity on mantle circulations and lateral thermal anomaliesThe influences of depth-dependent thermal expansivity on the structure of Newtonian thermal convection and lateral thermal anomalies are studied. In an aspect-ratio ten box the effects of the depth-dependent expansivity are to produce large aspect-ratio cells with a few relatively stationary upwellings. The lateral thermal anomalies in the lower mantle are greatly diminished by depth-dependent expansivity. This together with a decrease in the temperature derivative of seismic velocities in the lower mantle would support the low level of lateral heterogeneities found in recent tomographic studies.
Document ID
19910059794
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hansen, Ulrich
(Koeln, Universitaet Cologne, Federal Republic of Germany, United States)
Yuen, David A.
(Cologne Univ. Germany)
Kroening, Sherri E.
(Minnesota, University Minneapolis, United States)
Date Acquired
August 15, 2013
Publication Date
July 1, 1991
Publication Information
Publication: Geophysical Research Letters
Volume: 18
ISSN: 0094-8276
Subject Category
Geophysics
Accession Number
91A44417
Distribution Limits
Public
Copyright
Other

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