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Title: Observing and modeling long-perioud tridal variations in polar motion
Authors: Gross, R. S.
Dickman, S. R.
Keywords: Earth rotations
polar motion
Issue Date: 20-Sep-2011
Publisher: Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2011.
Citation: Journees 2011 : Systemes de reference spatio-temporels, Paris, France, September 20, 2011.
Abstract: By exchanging angular momentum with the solid Earth, ocean tides cause the Earth’s rotation to change. While hydrodynamic tide models have been used to study the effect of ocean tides on polar motion, it is shown here that none of the published models can fully account for the observed variations. An empirical ocean tide model is therefore determined by fitting periodic terms at the tidal frequencies to polar motion excitation observations spanning 1980.0−2010.4 from which atmospheric and non-tidal oceanic effects were removed. While the empirical ocean tide model does fully account for all of the observed tidal power, tests indicate that the model may not have completely converged. So better models of the effects of ocean tides on polar motion are still needed, both dynamical and empirical.
Appears in Collections:JPL TRS 1992+

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