Global Mean Mass Sea-Level Rise From 1993 to 2016 Derived by Tongji Monthly Gravity Field Solutions

In this contribution, we estimate the global mean mass sea-level (GMMSL) rise spanning January 1993 to December 2016 by using the Tongji-Grace2018 and Tongji-LEO2021 monthly gravity field solutions. In the post-processing, Tongji-Grace2018 and Tongji-Leo2021 solutions are filtered with P4M6 decorrelation plus Gauss 300km filtering, Tongji-Leo2021 solutions are filtered with Gaussian 1000km filtering, the C₂₀ and degree-1 coefficients are replaced with those from the GRACE technique note 13 and 14 for Tongji-Grace2018 solutions, and with those from satellite laser ranging for Tongji-LEO2021 solutions, the post-glacial isostatic adjustments are corrected with ICE6G-D model, and a 300km buffer zone is used due to leakage error. Moreover, the GMMSL is averaged with the open oceans within the latitude of ±66°, the Caspian Sea, Black Sea and the Mediterranean Sea are excluded. The derived GMMSL rise from Tongji-LEO2021 and Tongji-Grace2018 solutions is 1.67±0.08 mm/yr from 1993.01 to 2016.12, consistent with 1.73±0.08 mm/year from Altimetry minus Steric. When the same missing months as gravity field solutions are removed, the GMMSL rise from Altimetry minus Steric is 1.68±0.08 mm/yr from 1993.01 to 2016.12, much close to that from Tongji-LEO2021 and Tongji-Grace2018 solutions.