Final Technical Report for NAG5-7574 HIGH-RESOLUTION GRAVITY AND TIME-VARYING GRAVITY FIELD RECOVERY USING GRACE AND CHAMP

摘要

The investigation has conducted pilot studies to use the simulated GRACE and CHAMP data and other in Situ and space geodetic observable, satellite altimeter data, and ocean mass variation data to study the dynamic processes of the Faith which affect climate change. Results from this investigation include (1) a new method to use the energy approach for expressing gravity mission data as in rite measure nets with the possibility to enhance the spatial resolution of the gravity signal; (2) the method was tested using CHAMP and validated with the development of a mean gravity Field model using CHAMP data, (3) elaborate simulation to quantify errors of tides and atmosphere and to recover hydrological and oceanic signals using GRACE, results show that there are significant aliasing effect and errors being amplified in the GRACE resonant geopotential and it is not trivial to remove these errors, and (4) quantification of oceanic and ice sheet mass, Changes in a geophysical constraint study to Asser-s their contributions to global sea level change, while the results improved significant over the use of previous studies using only the SLR-d-termined zonal gravity change data, the constraint could be further improved with additional information on mantle theology, PGR and ice loading history.