EIGEN-6C: A High-Resolution Global Gravity Combination Model Including GOCE Data
GOCE satellite gradiometry data were combined with data from the satellite missions GRACE and LAGEOS and with surface gravity data. The resulting high-resolution model, EIGEN-6C, reproduces mean seasonal variations and drifts to spherical harmonic degree
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EIGEN-6C: A High-Resolution Global Gravity Combination Model Including GOCE Data Richard Shako, Christoph Förste, Oleh Abrikosov, Sean Bruinsma, Jean-Charles Marty, Jean-Michel Lemoine, Frank Flechtner, Hans Neumayer and Christoph Dahle
Abstract GOCE satellite gradiometry data were combined with data from the satellite missions GRACE and LAGEOS and with surface gravity data. The resulting high-resolution model, EIGEN-6C, reproduces mean seasonal variations and drifts to spherical harmonic degree and order (d/o) 50 whereas the mean spherical harmonic coefficients are estimated to d/o 1420. The model is based on satellite data up to d/o 240, and determined with surface data only above degree 160. The new GOCE data allowed the combination with surface data at a much higher degree (160) than was formerly done (70 or less), thereby avoiding the propagation of errors in the surface data over South America and the Himalayas in particular into the model.
20.1 Introduction High-resolution global gravity field models play a fundamental role in geodesy and Earth sciences, ranging from practical purposes like precise orbit determination to scientific applications like investigations of the density structure of the Earth’s interior. Such gravity field models are constructed by combining satellite and surface gravity data (e.g. Förste et al. 2008a; Pavlis et al. 2012). Each data type is sensitive to a specific spectral range of the gravity field, i.e. it contains usable signal in a certain bandwidth. The inclusion of the GOCE mission data allows a homogeneous satellite-based mapping of the gravity field to approximately degree and order R. Shako · C. Förste (B) · O. Abrikosov · F. Flechtner · H. Neumayer · C. Dahle GFZ German Research Centre for Geosciences, Dept 1 “Geodesy and Remote Sensing”, Telegrafenberg A17, 14473 Potsdam, Germany e-mail: [email protected] S. Bruinsma · J.-C. Marty · J.-M. Lemoine Groupe de Recherche de Géodésie Spatiale (GRGS), 18 Avenue Edouard Belin, 31401 Toulouse, France e-mail: [email protected]
F. Flechtner et al. (eds.), Observation of the System Earth from Space - CHAMP, GRACE, GOCE and Future Missions, Advanced Technologies in Earth Sciences, DOI: 10.1007/978-3-642-32135-1_20, © Springer-Verlag Berlin Heidelberg 2014
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(d/o) 200, corresponding to a model resolution of 100 km half-wavelength (e.g. Pail et al. 2011). The shorter wavelengths must be inferred from surface gravity data. Here we report on the combined model EIGEN-6C (EIGEN = European Improved Gravity model of the Earth by New techniques) which is the first combined global gravity field model using GOCE data. This model is complete to degree and order 1420 (corresponding to a model resolution of 14 km half-wavelength) and was jointly elaborated by GFZ Potsdam and CNES/GRGS Toulouse. This paper gives a short overview on the composition and main characteristics of this model.
20.2 Used Data and Combination Strategy The global combined gravity field model EIGEN-6C was constructed using the following sat
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