Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.g41c..04w&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #G41C-04
Physics
1214 Geopotential Theory And Determination, 1223 Ocean/Earth/Atmosphere Interactions (3339), 1227 Planetary Geodesy And Gravity (5420, 5714, 6019), 1234 Regional And Global Gravity Anomalies And Earth Structure, 1241 Satellite Orbits
Scientific paper
The new gravity missions (CHAMP, GRACE, and GOCE) will produce gravity field models of unprecedented accuracy. Along with this accuracy comes the challenge of validating the measurements, a difficult task when the measurements may be 1-3 orders of magnitude more accurate than previously available. To address this, the CHAMP and GRACE teams have developed a set of internal and external tests for the static and time varying geopotential solutions. The internal tests involve extensive comparison of gravity field solutions based on fully independent software and different analysis parameterizations. The external tests planned for GRACE include an innovative null test of the gravity (non)variability in arid regions (primarily Egypt), and comparison of observed variability with ocean bottom pressure recorders. Additional concepts such as comparison to surface gravimetry are also under review. In addition, for GRACE there are several key spacecraft and instrument calibrations requiring on-orbit maneuvers and/or simultaneous estimation with the gravity model. We will provide an overview of these cal/val programs, and briefly discuss the role the GRACE fields could play in calibrating GOCE measurements.
Bettadpur Srinivas
Gruber Th.
Romans Larry J.
Velicogna Isabella
Watkins Michael M.
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