Statistics – Computation
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3510304h&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 10, CiteID L10304
Statistics
Computation
10
Tectonophysics: Planetary Interiors (5430, 5724, 6024), Tectonophysics: Rheology: Mantle (8033), Tectonophysics: Dynamics Of Lithosphere And Mantle: General (1213), Tectonophysics: Heat Generation And Transport, Computational Geophysics: Numerical Solutions (4255)
Scientific paper
Numerical mantle convection simulations show that depth-dependent viscosity can increase the flow wavelength. A recent analysis demonstrates that flow channelization into a low-viscosity region lowers lateral dissipation. This allows long wavelength flow to more efficiently cool the interior mantle. We present three-dimensional, mixed heating mantle convection simulations with a thin low-viscosity channel for a range of aspect ratios to test the implications of the theoretical analysis. For reasonable viscosity contrasts between lithosphere, asthenosphere and bulk mantle we find that very large aspect ratios can develop. Velocity profiles quantify the degree of channelization for variable aspect ratios. Internal temperatures are found to decrease with increasing aspect ratio and both surface heat flux and velocity are found to increase with aspect ratio. Our results are consistent with the idea that the asthenosphere channels lateral mantle flow which, in turn, stabilizes long wavelength convection cells and makes long wavelength flow energetically favorable.
Höink Tobias
Lenardic Adrian
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