Physics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.2885s&link_type=abstract
Journal of Geophysical Research, vol. 87, Apr. 10, 1982, p. 2885-2903. Research supported by the Research Corp. and NSF.
Physics
119
Earth Rotation, Glaciology, Lithosphere, Polar Wandering (Geology), Viscoelasticity, Angular Velocity, Earth Core, Earth Mantle, Green'S Functions, Laplace Transformation
Scientific paper
It is pointed out that at least 3 times in the last billion years the planet earth, for some unknown reasons, has repeatedly entered and left long regimes of repeated continental glaciation. An investigation is conducted concerning the problem of a temporal evolution of polar motion as a result of active glaciation and deglaciation. Analytic solutions are developed for a three-tier model which includes an elastic lithosphere, a viscoelastic mantle, and an inviscid core. The important role played by the elastic lithosphere in preserving a final state, which is not compensated isostatically, is demonstrated. The obtained results suggest the importance of including the forcing from the Antarctic ice sheet in order to obtain a better overall fit to the rotational data and possibly to remove the existing nonuniqueness in deriving mantle viscosity from rotational dynamics.
Boschi Elisa
Sabadini Roberto
Yuen Dave A.
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