Effects of a realistic mantle thermal conductivity on the patterns of 3-D convection
作者： F. Dubuffet , D.A. Yuen , M. Rabinowicz
DOI: 10.1016/S0012-821X(99)00165-X
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摘要: Abstract A physical model describing the temperature and pressure dependences of mantle thermal conductivity has recently been provided by A.M. Hofmeister [Science 283 (1999) 1699–1706]. We have studied numerically influences such a temperature- pressure-dependent on 3-D constant viscosity convection. large aspect-ratio box 4 × 1 taken for Rayleigh numbers greater than 104 to 106. The power-law index governing phonon contribution controls style For silicates, pattern convection is quite different from that conductivity, whereas associated with oxides close case conductivity. Both Boussinesq extended-Boussinesq models viscous adiabatic heatings examined. Major effects variable are: (1) heating up lower mantle; (2) longer-wavelength convection; (3) shorter wavelength (4) thick stable plumes plumeheads; (5) thicker boundary layer around 500 km at base mantle. contributions new terms due in energy equation magnitudes several times chondritic layers. region superadiabatic about 400 600 K excess caused This finding an interesting implication recent seismic lighter density deep portion
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