Abstract
Analysis of 5½ years of Lageos satellite range data reveal significant residual nodal signatures: an acceleration and annual and semiannual periods. These signatures primarily reflect variations in the zonal gravitational harmonic J2 coefficient and hence the polar moment of inertia. The implied decrease of J̇2=−3×10−11 yr−1 is consistent with both historical observations of the nontidal acceleration of the Earth's rotation and models of viscous rebound of the solid Earth from the decrease in load due to the last deglaciation.
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Author information
Affiliations
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA
- C. F. Yoder
- , J. G. Williams
- & J. O. Dickey
Center for Space Research, University of Texas at Austin, Austin, Texas 78712, USA
- B. E. Schutz
- , R. J. Eanes
- & B. D. Tapley
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