Monthly gravity field recovery from GRACE orbits and K-band measurements using variational equations approach

摘要: Abstract The Gravity Recovery and Climate Experiment (GRACE) mission can significantly improve our knowledge of the temporal variability Earth's gravity field. We obtained monthly field solutions based on variational equations approach from GPS-derived positions GRACE satellites K-band range-rate measurements. impact different fixed data weighting ratios in recovery while combining two types was investigated for purpose deriving best combined solution. solution through above procedures named as Institute Geodesy Geophysics (IGG) models. IGG models were compared with Release05 (RL05) products following aspects: (i) trend mass anomaly China its nearby regions within 2005–2010; (ii) root mean squares global during (iii) time-series changes water storage region Amazon Basin Sahara Desert between 2005 2010. results showed that almost consistent RL05 aspects (i)–(iii). Changes annual amplitude 14.7 ± 1.2 cm IGG, 17.1 ± 1.3 cm Centre Space Research (CSR), 16.4 ± 0.9 cm GeoForschungsZentrum (GFZ) 16.9 ± 1.2 cm Jet Propulsion Laboratory (JPL) terms equivalent height (EWH), respectively. 1.2 cm, 0.9 cm, 0.9 cm 1.2 cm CSR, GFZ JPL, Comparison suggested at same accuracy level latest published by JPL.