Acknowledgements: L.M.P. is supported, in part, by award from the US National Science Foundation to Columbia University. J.K. was financially supported by the UK Met Office CSSP-China programme through the POzSUM project. We also acknowledge the World Climate Research Programme, which, through its Working Group on Coupled Modelling, coordinated and promoted CMIP6. We thank the climate modeling groups for producing and making available their model output, the Earth System Grid Federation (ESGF) for archiving the data and providing access, and the multiple funding agencies who support CMIP6 and ESGF. We thank Bodeker Scientific, funded by the New Zealand Deep South National Science Challenge, for providing the combined NIWA-BS total-column ozone database.