HR: 1340h
AN: G33C-0061    [Abstracts]
TI: Intercomparison of GRACE Temporal Gravity Solutions
AU: * Wiese, D N
EM: David.Wiese@colorado.edu
AF: Colorado Center for Astrodynamics Research, University of Colorado, UCB431, Boulder, CO 80309-0431 United States
AU: Nerem, R S
EM: nerem@colorado.edu
AF: Colorado Center for Astrodynamics Research, University of Colorado, UCB431, Boulder, CO 80309-0431 United States
AU: Leuliette, E W
EM: eric.leuliette@colorado.edu
AF: Colorado Center for Astrodynamics Research, University of Colorado, UCB431, Boulder, CO 80309-0431 United States
AU: Swenson, S
EM: Sean.Swenson@colorado.edu
AF: Dept. of Physics and CIRES, University of Colorado, Boulder, CO 80309 United States
AB: The GRACE mission has been producing monthly estimates of changes in the Earth's gravity field since April 2002. Converting the raw GRACE range, accelerometer, and GPS measurements into estimates of the gravity field is a complex process, and therefore different analysis groups use various "recipes" resulting in different models of the time-varying gravity field. We have intercompared the solutions generated by a number of groups (CSR, JPL, GSFC, GFZ, etc.) to determine the characteristics of each group's solutions as applied to different scientific applications. For different scales of spatial smoothing, we have examined the power spectrum of each model, the pattern of seasonal gravity variations, the residuals from a seasonal fit, comparisons of global mean ocean mass variations to models, and results from desert regions where the signals are known to be small, as well as a number of other evaluation criteria. We will postulate reasons for the differences in these solutions based on the processing methodologies applied.
DE: 1217 Time variable gravity (7223, 7230)
SC: Geodesy [G]
MN: Fall Meeting 2005