GGM02 – An improved Earth gravity field model from GRACE |
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Authors: | B Tapley J Ries S Bettadpur D Chambers M Cheng F Condi B Gunter Z Kang P Nagel R Pastor T Pekker S Poole F Wang |
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Institution: | (1) Center for Space Research, The University of Texas, 3925 W. Braker Lane, Suite 200, Austin, Texas 78759, USA |
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Abstract: | A new generation of Earth gravity field models called GGM02 are derived using approximately 14 months of data spanning from
April 2002 to December 2003 from the Gravity Recovery And Climate Experiment (GRACE). Relative to the preceding generation,
GGM01, there have been improvements to the data products, the gravity estimation methods and the background models. Based
on the calibrated covariances, GGM02 (both the GRACE-only model GGM02S and the combination model GGM02C) represents an improvement
greater than a factor of two over the previous GGM01 models. Error estimates indicate a cumulative error less than 1 cm geoid
height to spherical harmonic degree 70, which can be said to have met the GRACE minimum mission goals.
Electronic Supplementary Material Supplementary material is available in the online version of this article at |
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Keywords: | GRACE Geopotential Geoid Global gravity field modeling |
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