Physics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..812y&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 14, Aug. 1987, p. 812-815.
Physics
7
Azimuth, Earth Gravitation, Earth Mantle, Glaciers, Gravitational Fields, Secular Variations, Viscoelasticity, Antarctic Regions, Dynamic Response, Geochronology, Satellite Observation, Temporal Distribution
Scientific paper
Present-day glacial activities and the current variability of the Antarctic ice volume can cause variations in the long-wavelength gravity field as a consequence of transient viscoelastic responses in the mantle. The azimuthal dependence of the secular variations of the gravitational potential are studied and it is found that the nonaxisymmetric contributions are more important for recent glacial retreats than for Pleistocene deglaciation. Changes in land-based ice covering Antarctica can be detected by monitoring satellite orbits and their sensitivity to variations in gravitational harmonic for degree l greater than 3. Resonances in satellite orbits may be useful for detecting these azimuthally-dependent gravity signals.
Boschi Enzo
Gasperini Paolo
Sabadini Roberto
Yuen David A.
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