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On the usefulness of atmospheric and oceanic angular momentum in recovering polar motion and gravity field variations in a unified process

Lookup NU author(s): Craig Hancock, Professor Philip Moore


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Earth rotation parameters (ERPs) are excited by variations in the mass distribution on the Earth's surface and the exchange of angular momentum between the atmosphere and oceans and the solid Earth. The same mass redistribution causes temporal changes in the gravity field coefficients with the second degree harmonics related to the rotational deformation and hence to changes in the Earth's inertial tensor. If precise models of the atmospheric and oceanic angular momentum (AM) are available solution for polar motion and degree 2 Stokes harmonics can be unified. In this study we utilize SLR tracking of LAGEOS to compare (i) degree 2 harmonics from ERPs and gravitation, and (ii) LAGEOS excitation functions and geophysical data (mass + motion). Finally, we investigate to what extent a unified approach is possible with current models for AM data and gravity mass change estimated from ERP within orbit determinations. © 2007 COSPAR.

Publication metadata

Author(s): Hancock CM, Moore P

Publication type: Article

Publication status: Published

Journal: Advances in Space Research

Year: 2007

Volume: 39

Issue: 10

Pages: 1648-1655

ISSN (print): 0273-1177

ISSN (electronic):

Publisher: Pergamon


DOI: 10.1016/j.asr.2007.02.051


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