Physics
Scientific paper
May 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012geoji.189..799c&link_type=abstract
Geophysical Journal International, Volume 189, Issue 2, pp. 799-814.
Physics
Numerical Solutions, Dynamo: Theories And Simulations, Magnetic Anomalies: Modelling And Interpretation, Core, Outer Core And Inner Core, Dynamics: Convection Currents, And Mantle Plumes, Planetary Interiors
Scientific paper
We present the first investigation that explores the effects of an isolated topographic ridge on thermal convection in a planetary core-like geometry and using core-like fluid properties (i.e. using a liquid metal-like low Prandtl number fluid). The model's mean azimuthal flow resonates with the ridge and results in the excitation of a stationary topographic Rossby wave. This wave generates recirculating regions that remain fixed to the mantle reference frame. Associated with these regions is a strong longitudinally dependent heat flow along the inner core boundary; this effect may control the location of melting and solidification on the inner core boundary. Theoretical considerations and the results of our simulations suggest that the wavenumber of the resonant wave, LR, scales as Ro-1/2, where Ro is the Rossby number. This scaling indicates that small-scale flow structures [wavenumber ?] in the core can be excited by a topographic feature on the core-mantle boundary. The effects of strong magnetic diffusion in the core must then be invoked to generate a stationary magnetic signature that is comparable to the scale of observed geomagnetic structures [?].
Aurnou Jonathan M.
Calkins Michael A.
Eldredge Jeff D.
Noir Jérôme
No associations
LandOfFree
The effects of boundary topography on convection in Earth's core does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The effects of boundary topography on convection in Earth's core, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The effects of boundary topography on convection in Earth's core will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1551968