Mathematics – Logic
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984rspta.313...95r&link_type=abstract
(Royal Society, Discussion on Rotation in the Solar System, London, England, Mar. 8, 9, 1984) Royal Society (London), Philosophi
Mathematics
Logic
29
Annual Variations, Earth Rotation, Geodynamics, Coupling, Polar Wandering (Geology), Tides
Scientific paper
The mechanisms responsible for fluctuations in the earth's rotation are investigated in a review of recent theoretical and observational studies. The basic terminology is defined, and consideration is given to tidal terms, long-term nontidal changes, and decade fluctuations in the length of the day and to long-period and Chandler-wobble geographical motion of the rotation pole. It is shown that space observation techniques such as Lageos laser ranging and improved meteorological and geodynamic measurements have led to a better understanding of short-term processes (such as the effects of mantle anelasticity and core-mantle coupling) and can provide the basis for studying the zonal-tide-driven 18.6-yr length-of-day changes, polar wander, and the 30-yr Markowitz wobble in the coming decades. Better seismological data are required to investigate seismic excitation of the Chandler wobble or the topographic coupling of the core and mantle.
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