Physics
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pepi...50..280m&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 50, Issue 3, p. 280-290.
Physics
8
Scientific paper
Lateral variations in pressure associated with flow at the core-mantle boundary will produce deformations of the mantle. It is shown here that geostrophically plausible pressure gradients are sufficient to produce measurable changes in the length-of-day, polar motion, J2, sea-level, tilt, gravity and strain. Of these, polar motion is the most discriminating and limits intra-annual variations in the lateral pressure field, at planetary wavelength, to less than - 104 Pa. Satellite observations of changes in J2 are potentially even more useful. However, at present the time span of observations is short and the separation of a residual, which might be due to a change in the distribution of pressure at the core-mantle boundary, from other causes, such as post-glacial rebound, is ambiguous. It is suggested that not more than 10% of the decade variations in the length-of-day may be caused by pressure fluctuations at the core mantle boundary.
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