Dynamic Mechanisms Behind Periodic and Episodic Phenomena in the Earth's Interior

Details Dynamic Mechanisms Behind Periodic and Episodic Phenomena in the Earth's Interior Dynamic Mechanisms Behind Periodic and Episodic Phenomena in the Earth's Interior

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.v23c2147h&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #V23C-2147

Physics

1213 Earth'S Interior: Dynamics (1507, 7207, 7208, 8115, 8120), 1510 Dynamo: Theories And Simulations, 3225 Numerical Approximations And Analysis (4260), 8145 Physics Of Magma And Magma Bodies

Scientific paper

The evolution of many planets and the Earth in particular is clearly influenced by convective processes in the interior. Convection in the strongly nonlinear regime, as to be expected in planetary interiors, typically exhibits time dependent behavior, ranging from simple periodic to chaotic signatures. What are relevant mechanisms producing periodic and/or episodic events and what are typical scales. We employ numerical models allowing for realistic rheologies, i.e. temperature, pressure and stress-depenent visocities in order to identify key-mechanisms leading to time varying behavior. Clearly plumes, developing from the 670 km/ and or the Core mantle boundary develop periodically in a realisttic strong temperature dependence of the viscosity is assumed. With an appropriate rheology surface plates form naturally in our model, being an integral part of the convective system. We observe changes in the style of plate tectonics, showing transitions from periods of plate tectonics to stagnant lid convection and vice versa. This can potentially explain global changes in the surface dynamics of planets. We further demonstrate that separately convecting layers can originate from the interplay of compositional and thermal contributions. The creation of layers and their final destruction also induces periodic and episodic fluctuation in the planetary evolution

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