Comparison of polar motion excitation series derived from GRACE and from analyses of geophysical fluids

Details Comparison of polar motion excitation series derived from GRACE and from analyses of geophysical fluids Comparison of polar motion excitation series derived from GRACE and from analyses of geophysical fluids

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3411306n&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 11, CiteID L11306

Physics

5

Geodesy And Gravity: Mass Balance (0762, 1223, 1631, 1836, 1843, 3010, 3322, 4532), Geodesy And Gravity: Ocean/Earth/Atmosphere/Hydrosphere/Cryosphere Interactions (0762, 1218, 3319, 4550), Geodesy And Gravity: Earth Rotation Variations, Geodesy And Gravity: Satellite Geodesy: Results (6929, 7215, 7230, 7240)

Scientific paper

Three 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 χ 1 and χ 2. The GFZ and JPL excitations and the CSR χ 2 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.

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