Abstract
HUST-GOGRA2018s: A new gravity field model derived from the combination of GRACE and GOCE data
Highlights
It is significant for different disciplines, such as geophysics, geodesy and seismology, to construct global static gravity field models with high precision and spatial resolution, which are vital strategic data to understand structure of the Earth interior and solve the problems of resource and disaster (Kao et al 2017; Tanaka et al 2019)
Using the data spanning from January 2003 to April 2015, a new Gravity Recovery and Climate Experiment (GRACE)-only gravity field model is determined
The latest EIGEN-6C4 model is developed by the combination of Gravity field and steady-state Ocean Circulation Explorer (GOCE), GRACE, Laser Geodynamics Satellite (Lageos), gravity data and altimetry data, which perform better than a GRACE-only static gravity field model
Summary
It is significant for different disciplines, such as geophysics, geodesy and seismology, to construct global static gravity field models with high precision and spatial resolution, which are vital strategic data to understand structure of the Earth interior and solve the problems of resource and disaster (Kao et al 2017; Tanaka et al 2019). Many combination models purely determined by GRACE and GOCE data, GOCO01S (Pail et al 2010), GOGRA04S (Yi et al 2013), DGM-1S (Farahani et al 2013), GGM05G (Bettadpur et al 2015), and ITU_ GGC16 (Akyilmaz et al 2016), have been released. Due to the special north-south tracking pattern in GRACE mission, the sectorial and near-sectorial spherical harmonic coefficients are determined with poor quality in GRACE-only gravity field models (Wang et al 2012; Zhou et al 2016) These errors can be reduced by GOCE mission. The polar holes in GOCE mission affect the modelling precision of zonal and near-zonal spherical harmonic coefficients All these problems can be improved by GRACE observations. A new combination model is purely determined by the GRACE and GOCE data in this study
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