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摘要
A new monthly time-variable gravity field model WHU-Grace01s truncated to 60 degrees and orders is determined solely from GRACE KBRR data using dynamic integral approach in this paper. Compared with the Release 05 models from CSR, GFZ and JPL, the degree variance of WHU-Grace01s are smaller in high degrees, and it is not very sensitive to orbit resonance phenomenon. After applying the same filter to the temporal signals derived from the time-variable gravity field models published by WHU, CSR, GFZ, JPL, DEOS, Tongji, ITG, AIUB and GRGS, we can get several useful conclusions as follows, the distribution of temporal signal computed by WHU-Grace01s is similar to the other models, and its signal in the Pacific Ocean center and Sahara desert is relative smaller. The correlation coefficients of the temporal signal in Yangtze river and Pearl river basin between WHU-Grace01s and JPL can reach to 0. 948 and 0. 976 respectively, the average correlations coefficients between WHU-Grace01s and the aforementioned 8 time-variable gravity field models is bigger than 0. 90. All of the aforementioned time-variable gravity field models can detect the mass loss or accumulation in the Antarctica and Greenland, and the mass loss rate is similar to each other. In short, the accuracy of WHU-Grace01s has a good consistency with the previously published GRACE solutions, while the impact of orbit resonance on WHU-Grace01s is unconspicuous.
