Summary
We report results on the use of CHAMP observations for Earth's mean and time-varying gravity field solutions and the associated geophysical interpretation. 1.5 years of CHAMP data from May 2001 through February 2003 are used for monthly gravity solutions as well as a mean solution based on 6 months of data, employing the energy conservation principle and an efficient conjugate gradient inversion technique. The mean CHAMP gravity field model, OSU03a, is evaluated using other gravity fields model and various data including GPS leveling and Arctic 5′×5′ gravity anomalies. It is shown that OSU03a agrees well with EIGEN2 (CHAMP) model, and both models exhibit improvement over the polar regions. The estimated 3×3 CHAMP time-varying gravity field model, with the exception of J3 and 2nd order tesseral coefficients, are compared with available solutions using satellite laser ranging (SLR) for the semi-annual and annual components. It is shown that CHAMP temporal gravity solution agrees well with the SLR solutions as well as various geophysical fluid models, including atmosphere, hydrology, and ocean. The correlation coefficients between CHAMP and SLR solutions are 0.6∼0.8, with RMS at 0.7∼0.8 mm.
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsPreview
Unable to display preview. Download preview PDF.
References
Cheng MK, Gunter B, Ries J, Chambers DP, Tapley BD (2003) Temporal variations in the earth's gravity field from SLR and CHAMP GPS data. in: Tziavos I N (Ed.), Gravity and Geoid 2002, 3rd meeting of the IGGC, Thessaloniki, Greece: 424–431.
Han SC (2003) The Efficient Determination of Global Gravity Field From Satellite-to-satellite Tracking. Celestial Mechanics and Dynamical Astronomy, in press.
Han SC, Jekeli C, Shum CK (2002) Efficient gravity field recovery using in situ disturbing potential observables from CHAMP. Geophys Res Lett 29(16): 10.1029/2002GL015180.
Howe E, Tscheming C (2003) Preliminary analysis of CHAMP state vector and accelerometer data for the recovery of the gravity potential. in: Reigber Ch, Lühr H and Schwintzer P (eds), First CHAMP Mission Results for Gravity, Magnetic and Atmospheric Studies, Springer-Verlag: 140–145.
Jekeli C (1999) The determination of gravitational potential differences from satellite-to-satellite tracking. Celestial Mechanics and Dynamical Astronomy 75: 85–101.
Kenyon S, Forsberg R (2001) Arctic Gravity Project — a status. in: Sideris M (ed), Gravity, Geoid and Geodynamics 2000, International Association of Geodesy Symposia 123, Springer-Verlag: 391–395.
Nerem RS, Eanes RJ, Thompson PF, Chen JL (2000) Observations of annual variations of the Earth's gravitational field using satellite laser ranging and geophysical models. Geophys Res Lett 27: 1783–1786.
Sneeuw N, Gerlach C, Švehla D, Gruber C (2003) A first attempt at time-variable gravity recovery from CHAMP using the energy balance approach. in: Tziavos I N (ed), Gravity and Geoid 2002, 3rd meeting of the IGGC, Thessaloniki, Greece: 237–242.
Reigber Ch, Balmino G, Schwintzer P, Biancale R, Bode A, Lemoine JM, König R, Loyer S, Neumayer KH, Marty JC, Barthelmes F, Perosanz F, Zhu SY (2002) A high-quality global gravity field model from CHAMP GPS tracking data and accelerometry (EIGEN-1S). Geophys Res Lett 29(14): 10.1029/2002GL015064.
Reigber Ch, Jochmann H, Wünsch J, Neumayer KH, Schwintzer P (2003) First insight into temporal gravity variability from CHAMP. in: Reigber Ch, Lühr H and Schwintzer P (eds), First CHAMP Mission Results for Gravity, Magnetic and Atmospheric Studies, Springer-Verlag: 128–133.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2005 Springer-Verlag Berlin Heidelberg
About this chapter
Cite this chapter
Han, SC., Shum, C., Jekeli, C., Braun, A., Chen, Y., Kuo, CY. (2005). CHAMP Gravity Field Solutions and Geophysical Constraint Studies. In: Reigber, C., Lühr, H., Schwintzer, P., Wickert, J. (eds) Earth Observation with CHAMP. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-26800-6_17
Download citation
DOI: https://doi.org/10.1007/3-540-26800-6_17
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-22804-2
Online ISBN: 978-3-540-26800-0
eBook Packages: Earth and Environmental ScienceEarth and Environmental Science (R0)