Mantle convection with longest-wavelength thermal heterogeneity in a 3-D spherical model: Degree one or two?

Details Mantle convection with longest-wavelength thermal heterogeneity in a 3-D spherical model: Degree one or two? Mantle convection with longest-wavelength thermal heterogeneity in a 3-D spherical model: Degree one or two?

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3523302y&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 23, CiteID L23302

Physics

8

Tectonophysics: Dynamics Of Lithosphere And Mantle: General (1213), Tectonophysics: Dynamics: Convection Currents, And Mantle Plumes, Tectonophysics: Evolution Of The Earth (0325), Tectonophysics: Planetary Interiors (5430, 5724, 6024), Tectonophysics: Rheology: Mantle (8033)

Scientific paper

The formation of longest-wavelength mantle convection in the sluggish-lid regime is investigated using a three-dimensional spherical model. The bottom Rayleigh number is fixed at 107. Considering temperature-dependent rheology, degree-one dominant thermal convection occurs for both purely basal heating and mixed (i.e., basal and internal) heating modes. For the purely basal heating mode, degree-one convection occurs when the viscosity contrast due to temperature-dependent rheology is 103-104 in both Boussinesq and extended-Boussinesq fluids. However, with extended-Boussinesq fluid, degree-one convection may only occur in the basal heating mode: In the mixed heating mode, degree-one convection shifts to one with high-degree modes, presumably because of enhanced viscous dissipation in the highly viscous lid over up/downwelling plumes. The geophysically relevant degree-two convection with sheet-like downwellings is not observed in this study. The inclusion of visco-plastic rheology in the top part of the mantle breaks down degree-one convection.

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