Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.u41a0721l&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #U41A-0721
Physics
8120 Dynamics Of Lithosphere And Mantle: General, 8147 Planetary Interiors (5430, 5724), 8149 Planetary Tectonics (5475), 3230 Numerical Solutions
Scientific paper
Investigations of mantle convection with temperature- and stress-dependent viscosity have revealed the existence of fundamentally different convective styles: By varying e.g. the Rayleigh number, the viscosity contrast or the stress dependency of viscosity, the planform of convection in the asymptotic stationary state changes from the so-called stagnant lid regime to an episodic behaviour and further to a state characterized by a mobile surface. Our studies suggest that this transition may not only be induced by a change of parameters but also occurs temporally, i.e. a system that initially shows an episodic behaviour falls into the stagnant lid mode of convection as time proceeds. Such a temporal variation can probably describe the evolution of terrestrial planets like Mars, which is assumed to have undergone a change of convective style in its early history. In this contribution we present a 3D fluiddynamical model that exhibits a change of the convective style for temporally constant parameters. We also describe the methods developed to characterize different regimes and to identify the transitions observed.
Hansen Ulrich
Loddoch Alexander
Stein Cliff
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