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- W2203301140 abstract "Convective motions mix the fluid outer core, so that it is close to a state of uniform composition and specific entropy. The strength and nature of these motions vary with depth, with a plume region near the inner-core boundary, a well-mixed interior region, and possibly a stable layer beneath the core–mantle boundary. In all these regions, small-scale motions are strongly influenced by the Coriolis and Lorentz forces, resulting in anisotropic ‘pancake-shaped’ structures which are flattened in the direction normal to the plane defined by the rotation and magnetic-field vectors. Within the plume region, convection may be characterized by relatively few, but vigorous, plumes rising through a stably stratified, slowly descending fluid. These plumes are unstable and fragment as they rise, merging into the well-mixed interior. Dynamics of core motions are affected by the diffusivities of momentum, heat, composition and magnetic field, and a realistic numerical model of the dynamo must adequately quantify the effects of these diffusivities on the small (subgrid) scales of motion. Magnetic diffusivity is sufficiently large that its effects need explicit representation, while the need to parametrize the relatively small viscous force will wane as better numerical schemes are adopted. Heat and composition behave similarly dynamically and it may be sufficient to adopt a single parametrization for diffusion of both. An accurate parametrization must include the effects of anisotropy and scale dependence." @default.
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- W2203301140 date "2007-01-01" @default.
- W2203301140 modified "2023-09-27" @default.
- W2203301140 title "Turbulence and Small-Scale Dynamics in the Core" @default.
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