Dynamical influences from thermal-chemical instabilities at the core-mantle boundary

Details Dynamical influences from thermal-chemical instabilities at the core-mantle boundary Dynamical influences from thermal-chemical instabilities at the core-mantle boundary

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16..629h&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 16, July 1989, p. 629-632. Research supported by DFG, NSF, and NASA.

Physics

42

Convective Heat Transfer, Earth Core, Earth Mantle, Geochemistry, Boundary Layer Stability, Inhomogeneity, Topography, Vertical Distribution

Scientific paper

Two-dimensional time-dependent calculations have been performed in order to explore the interaction between lower-mantle thermal-chemical heterogeneities and the main mantle circulation and to study the dynamical effects of these thermal-chemical flows on the core-mantle boundary (CMB). The nature of the CMB deformation in thermal-chemical convection is found to differ from that in thermal convection. The results show the amplitude of CMB hills to be greatly reduced due to the depth-dependence of thermal expansivity noted in recent high-pressure experiments.

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