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The terrestrial time-varying microgravity observation can be used to study the crustal mass transfer. The uncertainty of the gravity instrument is an important factor that can easily affect the data quality of gravity observations. In this paper, we focus on the time-varying gravity dataset from 2015 to 2018 in South China. Based on Bayesian analysis method, we quantify the related uncertainty sources of the gravity instruments, including the nonlinear drift of relative gravimeter and thedoi:10.11947/j.agcs.2021.20200386 doaj:0a46bf3eca1d45a881c96538588d4aaf fatcat:3vlzxfwmyfe43osuj4cobgywyy