Admittance for a convection in a layered spherical shell

Details Admittance for a convection in a layered spherical shell Admittance for a convection in a layered spherical shell

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984geoj...77..461l&link_type=abstract

Geophysical Journal (ISSN 0016-8009), vol. 77, May 1984, p. 461-482.

Physics

Geophysics

15

Convective Heat Transfer, Earth Planetary Structure, Geophysics, Gravity Anomalies, Planetary Gravitation, Spherical Shells, Earth Mantle, Lithosphere, Plates (Tectonics), Strata, Viscosity

Scientific paper

A formalism based on an analytical approximation for convection in a layered spherical shell leads to the computation of the Green kernels for topography and gravity, and to the admittance of gravity over topography for the harmonics of the earth. The roles of increasing viscosity with depth, of two layers of convection, and of coupling with lithospheric plates are studied. It is found that a planet with constant viscosity will have positive values for the admittance for all wavenumbers. However, when a step of viscosity between the lower and upper mantle is assumed, negative values for the first harmonics are achieved. This result explains some long-wave observations and provides evidence for an increase of viscosity in the lower mantle.

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