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Dynamical influences from thermal‐chemical instabilities at the core‐mantle boundary
Author(s) -
Hansen Ulrich,
Yuen David A.
Publication year - 1989
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl016i007p00629
Subject(s) - thermal , mantle (geology) , mantle convection , core–mantle boundary , convection , geophysics , geology , mechanics , convective heat transfer , amplitude , thermodynamics , physics , optics , paleontology , tectonics , subduction
Two‐dimensional, time‐dependent calculations show that the thermal and flow structures can be influenced by the lower‐mantle thermal‐chemical instabilities. The style of the core‐mantle boundary (CMB) deformation in thermal‐chemical convection is different from that obtained in thermal convection. The amplitude of CMB hills is reduced greatly from the depth‐dependence of thermal expansivity, found in recent high‐pressure experiments.