Modeling core fluid motions and the drift of magnetic field patterns at the CMB by use of topography obtained by seismic inversion

Details Modeling core fluid motions and the drift of magnetic field patterns at the CMB by use of topography obtained by seismic inversion Modeling core fluid motions and the drift of magnetic field patterns at the CMB by use of topography obtained by seismic inversion

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.1473k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 17, Sept. 1990, p. 1473-1476.

Physics

Fluid Dynamics

12

Earth Core, Earth Mantle, Fluid Dynamics, Magnetic Field Configurations, Temperature Gradients, Boundary Layers, Flow Distribution, Fluid Flow, Seismic Waves, Topography

Scientific paper

The thermal wind equations, in which the Coriolis force is balanced by pressure gradients and horizontal density gradients rather than by Lorentz forces, are used to describe patterns of magnetic field drift associated with core fluid motions near the core-mantle boundary (CMB). The advection of magnetic field may be due in part to the flow driven by such horizontal temperature gradients, just as East-West air flow is driven by North-South temperature gradients in the earth's atmosphere. It is argued that this flow may be concentrated in a shell near the CMB, and the horizontal temperature gradients are expected to be directly proportional to horizontal gradients in CMB topography, the lowest harmonics of which are approximately constrained in seismology. Part of the zonal drift is then associated with the 1 = 2, m = 0 harmonic of CMB topography, and anticyclones are attached to topographic highs (thermal highs). Comparison of the derived flow pattern with those determied purely by magnetic field observations provides tentative support for the model.

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