Fast plumeheads: Temperature-dependent versus non-Newtonian rheology

Tine B. Larsen, David A. Yuen

Research output: Contribution to journalArticlepeer-review

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In a series of two-dimensional Cartesian simulations with high resolution, on the order of 2 km, we have compared for the same effective Rayleigh number, around 106, the dynamics between Newtonian and non-Newtonian rheologies. A viscosity contrast due to temperature of 1200 has been employed throughout with surface dissipation numbers varying between 0.05 and 0.2. Peak velocities for non-Newtonian plumes are at least 50 times faster than the peak Newtonian velocities and reach magnitudes in excess of m/yr. Upon impinging the surface, plume head structures of the non-Newtonian rheology contain much greater complexity in the thermal-mechanical structure than for Newtonian plumes.

Original languageEnglish (US)
Article number97GL01886
Pages (from-to)1995-1998
Number of pages4
JournalGeophysical Research Letters
Issue number16
StatePublished - 1997


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