Non-adiabaticity in mantle convection

Details Non-adiabaticity in mantle convection Non-adiabaticity in mantle convection

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28..879b&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 5, p. 879-882

Physics

20

Mineral Physics: Equations Of State, Seismology: Core And Mantle, Tectonophysics: Earth'S Interior-Composition And State, Tectonophysics: Heat Generation And Transport

Scientific paper

Seismic observations indicate that Earth's lower mantle is homogeneous as revealed by smooth depth variatons of the bulk sound velocity and Bullen's inhomogeneity parameter ɛ being close to one. Here we show with 3D spherical convection simulations that it should also be non-adiabatic because a significant proportion of mantle heat sources is internal. The computer simulations predict non-adiabaticity of 100-300 degrees for the lower mantle geotherm, with ɛ~1.01 implying that the temperature drop across the Core Mantle Boundary exceeds 1000 degrees.

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