Structure of the inner core boundary

Details Structure of the inner core boundary Structure of the inner core boundary

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gapfd..25..139l&link_type=abstract

Geophysical and Astrophysical Fluid Dynamics (ISSN 0309-1929), vol. 25, no. 1-2, Aug. 1983, p. 139-155.

Physics

Fluid Dynamics

28

Earth Core, Earth Planetary Structure, Geodynamics, Thermodynamics, Convective Flow, Dynamo Theory, Mathematical Models, Seismic Waves

Scientific paper

The present inner core boundary (ICB) model is consistent with current concepts concerning the dynamic and thermodynamic state of the core. The model also reflects 1.0-sec period seismic waves, requiring the solid mass fraction below the ICB to grow to a significant fraction over approximately one km. The rapid growth of solid with depth is due to the downward fluid flow from the outer core that is part of the geodynamo-sustaining convective motion. The gradual cooling of the outer core causes the ICB to advance by means of dendrite tip growth. An equilibrium profile for the mass fraction of solid with depth results below which the ICB is capable of yielding sharp seismic wave reflections.

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