Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.t11f..03l&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #T11F-03
Physics
0560 Numerical Solutions (4255), 4445 Nonlinear Differential Equations, 8121 Dynamics: Convection Currents, And Mantle Plumes, 8147 Planetary Interiors (5430, 5724, 6024), 8149 Planetary Tectonics (5475)
Scientific paper
Investigations of mantle convection with temperature- and strain-rate-dependent viscosity have shown the existence of three fundamentally different convective styles. By varying e.g. the Rayleigh number, the viscosity contrast or the strain-rate dependency of viscosity either the so-called stagnant lid regime, the episodic behavior or a state characterized by a constantly mobilized surface is obtained. Our studies suggest that this transition may not only be induced by a change of parameters but also occurs temporally. For example, a system initially showing an episodic behavior falls into the stagnant lid mode of convection as time proceeds. In this contribution we present a 3D fluid dynamical model that shows a change in the convective style for temporally constant parameters. We developed a mobilization criterion that describes the stability of the stagnant surface layer. This allows for a quantitative analysis of the transition to a temporarily mobilized surface. The criterion is used to predict the occurrence of further surface mobilization events. It furthermore provides insights into the temporal characteristics of the newly found transitional regime.
Hansen Ulrich
Loddoch Alexander
Stein Cliff
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