Correction to: Nature https://doi.org/10.1038/s41586-018-0123-1, published online 16 May 2018.

In Fig. 2 of this Analysis, the tick-mark labels on the colour bars in the second and third images from the top were inadvertently swapped. In addition, the citation at the end of the sentence, “On a monthly basis GRACE can resolve TWS changes with sufficient accuracy over scales that range from approximately 200,000 km2 at low latitudes to about 90,000 km2 near the poles” should be to ref. 4 not ref. 1. These errors have been corrected online.