Physics
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pepi..111...21b&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 111, Issue 1-2, p. 21-34.
Physics
21
Scientific paper
It is supposed that the stably stratified layer exists at the top of the fluid core. We propose a new model of this layer, which we call the Stratified Ocean of the Core (SOC). The SOC has a density that differs very little from the one corresponding to the adiabatic density gradient, but this small difference implies a very large buoyancy force. Therefore, hydrodynamic properties of such a thin layer differ drastically from those of the bulk of the Earth's core. There is a close similarity between the SOC and the Earth's common ocean: both of them are a thin shell, and their Brunt-Väisälä frequencies are of the same order of magnitude. New features are added to the SOC due to the effects of the core magnetic field. We consider various kinds of waves, with periods ranging from days to decades, which can develop in the SOC. The oscillations in the SOC with periods about decades determine the decade geomagnetic and length-of-day variations. The topographic core-mantle coupling, arising due to perturbation of fluid motion in the SOC by the core-mantle boundary unevenness, is considered. The key problem of proving the very existence of the SOC is discussed.
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