Low-degree temporal gravity field variations using CHAMP data

HR: 08:15h
AN: G31A-02 INVITED [PDF]
TI: Low-degree temporal gravity field variations using CHAMP data
AU: * Reigber, C
EM: reigber@gfz-potsdam.de
AF: GeoForschungsZentrum Potsdam, Dept. 1 "Geodesy & Remote Sensing" Telegrafenberg A 17, Potsdam, 14473 Germany
AU: Jochmann, H
AF: GeoForschungsZentrum Potsdam, Dept. 1 "Geodesy & Remote Sensing" Telegrafenberg A 17, Potsdam, 14473 Germany
AU: W］sch, J
AF: GeoForschungsZentrum Potsdam, Dept. 1 "Geodesy & Remote Sensing" Telegrafenberg A 17, Potsdam, 14473 Germany
AU: Petrovic, S
AF: GeoForschungsZentrum Potsdam, Dept. 1 "Geodesy & Remote Sensing" Telegrafenberg A 17, Potsdam, 14473 Germany
AU: Schwintzer, P
AF: GeoForschungsZentrum Potsdam, Dept. 1 "Geodesy & Remote Sensing" Telegrafenberg A 17, Potsdam, 14473 Germany
AU: Barthelmes, F
AF: GeoForschungsZentrum Potsdam, Dept. 1 "Geodesy & Remote Sensing" Telegrafenberg A 17, Potsdam, 14473 Germany
AU: Forste, C
AF: GeoForschungsZentrum Potsdam, Dept. 1 "Geodesy & Remote Sensing" Telegrafenberg A 17, Potsdam, 14473 Germany
AU: Neumayer, K
AF: GeoForschungsZentrum Potsdam, Dept. 1 "Geodesy & Remote Sensing" Telegrafenberg A 17, Potsdam, 14473 Germany
AB: The ability to recover with CHAMP the Earth's gravity field homogeneously and precisely from only a few weeks' worth of GPS satellite-to-satellite tracking data stimulates the investigation of temporal gravity field variations as seen by CHAMP. From a multi-annual exploitation of CHAMP data, time series of low degree spherical harmonic gravitational coefficients are derived and evaluated in the spatial and spectral domain by comparison with geophysical data and models covering atmospheric, oceanic and hydrologic mass redistributions. The space/time resolution and stability obtainable with a mission like CHAMP in recovering short-term environmentally induced gravity field variations were estimated. From experience gained up to now with the CHAMP data processing, the investigations are restricted to spherical harmonics up to degree/order 4, i.e. spatial wavelengths not shorter than 10000 km. The coefficients' time series are simultaneously derived in a comprehensive global gravity field solution with the higher-degree terms kept time-invariant. Results from both CHAMP-only and CHAMP combined with selected Laser satellite solutions are studied.
DE: 1214 Geopotential theory and determination
DE: 1243 Space geodetic surveys
SC: Geodesy [G]
MN: 2003 Fall Meeting