Excitation of the earth's rotational axis by recent glacial discharges

Details Excitation of the earth's rotational axis by recent glacial discharges Excitation of the earth's rotational axis by recent glacial discharges

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13..533g&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 13, June 1986, p. 533-536. Research supported by the Societa Aeronautica Ita

Physics

16

Axes Of Rotation, Earth Rotation, Glaciers, Land Ice, Antarctic Regions, Earth Mantle, Polar Wandering (Geology), Secular Variations

Scientific paper

The authors study the effects of present-day glacial discharges and the growth of the Antarctic ice sheet on exciting the earth's rotational axis. Glacial forcing could cause a maximum change in J2 of about one-third of the observed amount, for the Maxwell rheology and for Burgers' body models with a long-term, lower-mantle viscosity greater than about 1023P. For transient rheologies the amount of excitation due to glacial melting decreases. Polar wander is not much excited by recent glacial melting for the various types of rheologies examined.

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