Correction to: Nature Climate Change https://doi.org/10.1038/nclimate3157, published online 14 November 2016.

In the legend for the light blue bars in Fig. 4 of this Letter, there is an erroneous ∂ before the q; that is, it is written as \(- \left\langle {\nabla \cdot \left( {\partial V \cdot \partial q} \right)} \right\rangle\) but should be \(- \left\langle {\nabla \cdot \left( {\partial V \cdot q} \right)} \right\rangle\).