Nature Geoscience 10, 646–651 (2017); published online 28 August 2017; corrected after print 29 August 2017.

In the version of this Article originally published, the directional labels on the x-axes of Figures 1a–d and 2a were W (west), when they should have been E (east). In Figures 2b, 4a,b and 5a–c, the x-axes were given as longitude, when they should have been average wind speed. These errors have been corrected in the online version of the Article.