Our team developed a new time series of monthly gravity field models named Tongji-LEO2021 (up to degree and order 40) from orbit observations of Early Low Earth Orbit (LEO) satellites (including SPOT2, SPOT3, SPOT4, TOPEX/Poseidon, ERS-1 and ERS-2) based on an optimized short-arc method (Chen et al., 2019) over the period from January 1993 to December 2004. The results show that the hydrology signals derived from Tongji-LEO2021 solutions have good agreement with those from GLDAS models, indicating that Tongji-LEO2021 monthly temporal gravity field models are useful for quantitatively estimating global mass changes before the GRACE era.

Corresponing author：ProfessorQiujie Chen (qiujiechen@tongji.edu.cn)

lThe Tongji-LEO2021 solutions can be directly downloaded from the website of Tongji-LEO2021.rar .

When using this data, please cite the following publications which provide details about the approach and the models used.

Chen Q, Wang F, Shen Y, Zhang X, Nie Y, Chen J (2022). Monthly Gravity Field Solutions from Early LEO Satellites' Observations Contribute to Global Ocean Mass Change Estimates over 1993~2004. Geophysical Research Letters. (Accepted).

Chen Q, Shen Y, Chen W, Francis O, Zhang X, Chen Q, Li W, Chen T, Hsu H (2019). An Optimized Short-arc Approach: Methodology and Application to Develop Refined Time Series of Tongji-Grace2018 GRACE Monthly Solutions. Journal of Geophysical Research: Solid Earth, 124(6): 6010-6038.