Recent Earth oblateness variations: unraveling climate and postglacial rebound effects.

@article{Dickey2002RecentEO,
  title={Recent Earth oblateness variations: unraveling climate and postglacial rebound effects.},
  author={Jean O. Dickey and Steven L. Marcus and Olivier de Viron and Ichiro Fukumori},
  journal={Science},
  year={2002},
  volume={298 5600},
  pages={1975-7}
}
Earth's dynamic oblateness (J2) has been decreasing due to postglacial rebound (PGR). However, J2 began to increase in 1997, indicating a pronounced global-scale mass redistribution within Earth's system. We have determined that the observed increases in J2 are caused primarily by a recent surge in subpolar glacial melting and by mass shifts in the Southern, Pacific, and Indian oceans. When these effects are removed, the residual trend in J2 (-2.9 x 10(-11) year-1) becomes consistent with… CONTINUE READING
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