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Title:
Present-day secular variations in the zonal harmonics of earth's geopotential
Authors:
Mitrovica, J. X.; Peltier, W. R. 
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts), AB(Department of Physics, University of Toronto, Toronto, Ontario, Canada)
Publication:
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. B3, p. 4509-4526. (JGR Homepage)
Publication Date:
03/1993
Category:
Geophysics
Origin:
STI
NASA/STI Keywords:
Geopotential, Planetary Evolution, Planetary Gravitation, Secular Variations, Zonal Harmonics, Earth Mantle, Glaciology, Ocean Models, Viscosity
DOI:
10.1029/92JB02700
Bibliographic Code:
1993JGR....98.4509M

Abstract

The mathematical formulation required for predicting secular variation in the geopotential is developed for the case of a spherically symmetric, self-gravitating, viscoelastic earth model and an arbitrary surface load which can include a gravitational self-consistent ocean loading component. The theory is specifically applied to predict the present-day secular variation in the zonal harmonics of the geopotenial arising from the surface mass loading associated with the late Pleistocene glacial cycles. A procedure is outlined in which predictions of the present-day geopotential signal due to the late Pleistocene glacial cycles may be used to derive bounds on the net present-day mass flux from the Antarctic and Greenland ice sheets to the local oceans.
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