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We examine Earth’s polar motion (PM) for the years 1979–2010 to understand climate related sources of PM excitation at periods longer than a year, and to investigate Antarctic and Greenland ice mass balance contributions to long period PM. There is particular interest in years prior to the GRACE mission (prior to 2002). Although long period PM is dominantly a measure of changes in two spherical harmonic...
Many recent studies of polar motion have demonstrated that climate-related variations (air and water motion and mass redistribution) provide the dominant source of polar motion excitation over virtually the entire band of frequencies that can be studied with modern space geodetic data. In spite of this general conclusion, when numerical model estimates of climate sources are actually compared with...
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