Charlotte Merchant, Intelligent Earth Centre for Doctoral Training, University of Oxford, Oxford, United Kingdom; Atmospheric, Oceanic and Planetary Physics, University of Oxford, Oxford, United Kingdom, Bruno Deremble, Université Grenoble Alpes (UGA)/CNRS, Institut des Géosciences de l'Environnement (IGE), Grenoble, France and Fenwick Cooper, University of Oxford, Department of Physics, Oxford, United Kingdom