Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmgp31a0183r&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #GP31A-0183
Physics
1507 Core Processes (8115), 1510 Dynamo Theories
Scientific paper
The Earth precesses once every 25,800 years about an axis perpendicular to the ecliptic due to the gravitational fields of the sun and moon acting on the Earth's equatorial bulge. Since this effect seems small relative to inferred thermal and compositional processes in the core, it has invariably been ignored in geodynamo simulations. However laboratory models of a precessing Earth using a water-filled, oblate spheroid show unexpectedly rich behavior culminating in a highly dissipative turbulent flow. Presently it still remains unclear how to scale up the variety of flow phenomena seen in the laboratory to Earth-like parameters. Motivated by this and by questions of how such flows would interact with convectively-driven motions, we will discuss a numerical model based upon a code used with (some) success to simulate a convectively-stirred core (Glatzmaier & Roberts 1995). Crucial new ingredients are the CMB non-sphericity which must be included and the stiffness of the calculation which requires daily timescales to be resolved. We shall discuss how the the non-sphericity of the CMB can be included through the use of a non-orthogonal coordinate system and we shall present preliminary results for motions driven in the core by the precessing mantle.
Glatzmaier Gary A.
Kerswell Rich R.
Roberts Paul H.
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