Dissipation at the core-mantle boundary on a small-scale topography

Details Dissipation at the core-mantle boundary on a small-scale topography Dissipation at the core-mantle boundary on a small-scale topography

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jgrb..11104413l&link_type=abstract

Journal of Geophysical Research, Volume 111, Issue B4, CiteID B04413

Physics

5

Geodesy And Gravity: Earth Rotation Variations, Geomagnetism And Paleomagnetism: Core Processes (1213, 8115), Planetary Sciences: Fluid Planets: Orbital And Rotational Dynamics (1221), Planetary Sciences: Fluid Planets: Tidal Forces

Scientific paper

The parameters of the nutations are now known with a good accuracy, and the theory accounts for most of their values. Dissipative friction at the core-mantle boundary (CMB) and at the inner core boundary is an important ingredient of the theory. Up to now, viscous coupling at a smooth interface and electromagnetic coupling have been considered. In some cases they appear hardly strong enough to account for the observations. We advocate here that the CMB has a small-scale roughness and estimate the dissipation resulting from the interaction of the fluid core motion with this topography. We conclude that it might be significant.

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