 This paper examined the uncertainties associated with estimating groundwater storage changes in mainland China, using the Gravity Recovery and Climate Experiment, GRACE satellite system. The authors used a Bayesian model averaging approach to generate multiple solutions for each year from 2003 to 2015. They then compared these solutions to other sources of data such as soil moisture measurements and found that the GRACE data had higher uncertainties than the other sources. The authors also looked at 10 different river basins and found that the uncertainties varied greatly depending on the basin. Overall, this paper provides valuable insight into the uncertainties associated with using GRACE data to measure groundwater storage changes. This article was authored by Chuanjou Li, Yun Pan, Chong Zhang, and others. We are article.tv, links in the description below.