The spatio-temporal variability of groundwater storage in the Amazon River Basin

•This study analyzes the temporal evolution of the goundwater storage of the Amazon Basin over 2003–2010.•Seasonal variations of groundwater storage represent between 20 and 35% of the terrestrial water storage seasonal volume variations of the Amazon.•Anomalies of groundwater storage exhibit a strong interannual variability in response to hydrologic events such as the extreme drought that occurred in 2005.