Abstract
We present the general expression for the topographic and electromagnetic torques acting at the core-mantle boundary (CMB) as a function of the outer core flow. Invoking angular momentum conservation of the Earth and of the core, we compute the perturbations in the rotation of the Earth, at the decade time-scale, resulting from this fluid motion, since 1900. Electromagnetic coupling is too weak to excite polar motion by two or three orders of magnitude. Although the pressure torque on a CMB topography computed by the authors involves some correlations between the temporal variation of the computed ω 2-component of the polar motion and that observed, its amplitude is too weak by a factor of 10 and we have to conclude that it does not seem to be responsible for the decade variations of the polar motion.
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