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Comparison of Polar Motion Excitation Series Derived from GRACE and from Analyses of Geophysical FluidsThree sets of degree-2, order-1 harmonics of the gravity field, derived from the Gravity Recovery and Climate Experiment (GRACE) data processed at the Center for Space Research (CSR), Jet Propulsion Laboratory (JPL) and GeoforschungsZentrum (GFZ), are used to compute polar motion excitation functions X1 and X2. The GFZ and JPL excitations and the CSR X2, excitation compare generally well with geodetically observed excitation after removal of effects of oceanic currents and atmospheric winds. The agreement considerably exceeds that from previous GRACE data releases. For the JPL series, levels of correlation with the geodetic observations and the variance explained are comparable to, but still lower than, those obtained independently from available models and analyses of the atmosphere, ocean, and land hydrology. Improvements in data quality of gravity missions are still needed to deliver even tighter constraints on mass-related excitation of polar motion.
Document ID
20080014849
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Nastula, J.
(Polish Academy of Sciences Warsaw, Poland)
Ponte, R. M.
(Atmospheric and Environmental Research, Inc. Lexington, MA, United States)
Salstein, D. A.
(Atmospheric and Environmental Research, Inc. Lexington, MA, United States)
Date Acquired
August 24, 2013
Publication Date
June 13, 2007
Subject Category
Geophysics
Funding Number(s)
CONTRACT_GRANT: NNG04GF93G
Distribution Limits
Public
Copyright
Other

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