This is the final version of the article. Available from the publisher via the DOI in this record.Published by Copernicus Publications on behalf of the European Geosciences UnionWe demonstrate that both the current (New Dynamics), and next generation (ENDGame) dynamical cores of the UK Met Office global circulation model, the UM, reproduce consistently, the long-term, large-scale flows found in several published idealised tests. The cases presented are the Held-Suarez test, a simplified model of Earth (including a stratosphere), and a hypothetical tidally locked Earth. Furthermore, we show that using simplifications to the dynamical equations, which are expected to be justified for the physical domains and flow regimes we have studied, and which are supported by the ENDGame dynamical core, also produces matching long-term, large-scale flows. Finally, we present evidence for differences in the detail of the planetary flows and circulations resulting from improvements in the ENDGame formulation over New Dynamics.We would like to thank Paul Ullrich and
Kevin Heng for their valuable comments, when reviewing this
manuscript. We would also like to thank Tom Melvin for his
expert advice, and both Charline Marzin and Douglas Boyd for
technical help. This work is supported by the European Research
Council under the European Community’s Seventh Framework
Programme (FP7/2007-2013 Grant Agreement no. 247060) and
by the Consolidated STFC grant ST/J001627/1. This work is also
partly supported by the Royal Society award WM090065. The
calculations for this paper were performed on the DiRAC Facility
jointly funded by STFC, the Large Facilities Capital Fund of BIS,
and the University of Exeter
