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• W2965448001 abstract "Abstract Core‐mantle boundary (CMB) topography may provide useful hints on the deep mantle thermochemical structure, as clusters of thermal plumes and piles of chemically differentiated material, which are usually proposed as end‐member explanations for the large low shear‐wave velocity regions observed in the deep mantle, have different actions on this topography. CMB topography is further sensitive to several parameters, including mantle viscosity and its variations with thermal and compositional changes. Here we assess the influence of the postperovskite (pPv) phase viscosity on deep mantle dynamics and on CMB topography. We perform numerical simulations of thermal and thermochemical convection in spherical geometry, varying the ratio between pPv and bridgmanite viscosities, Δη pPv , between 1 (regular pPv) and 10 −3 (weak pPv). Thermochemical structures are dominated by smaller‐scale wavelengths (spherical harmonic degrees 3 to 6) and are more stable in weak than in regular pPv models. The amplitude of CMB topography is reduced by about a factor of 2 as Δη pPv changes from 1 to 10 −3 , mostly due to a sharp drop in the depressions induced by downwellings reaching the CMB. By contrast, the topographies induced by plumes clusters and thermochemical piles are mostly unaffected. For all the values of Δη pPv we tested, long‐wavelength CMB topography and reconstructed shear‐wave tomography are anticorrelated in purely thermal models, and correlated in thermochemical models with strong chemical density contrast (Δρ C = 140 kg/m 3 ). In models with smaller density contrast (Δρ C = 90 kg/m 3 ), topography and tomography are anticorrelated at Δη pPv = 1, but correlated at Δη pPv = 10 −3 ." @default.
• W2965448001 created "2019-08-13" @default.
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• W2965448001 date "2019-08-01" @default.
• W2965448001 modified "2023-10-13" @default.
• W2965448001 title "Core‐Mantle Boundary Dynamic Topography: Influence of Postperovskite Viscosity" @default.
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• W2965448001 doi "https://doi.org/10.1029/2019jb017859" @default.
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