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Co-hosted by the Grantham Institute, a Royal Meteorological Society meeting was held on 18 November 2019 to discuss climate change around the globe and the two recently released Intergovernmental Panel on Climate Change (IPCC) Special reports (SR) (IPCC, 2019a,b). The meeting’s presentations and panel discussions covered the current state of knowledge on climate change and the options for action.

A weakly nonlinear time-dependent theory for the evolution of superharmonics generated by the nonlinear self-interaction of a mode-1 internal tide in non-uniform stratification is developed and compared to numerical simulations.