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We demonstrate that LFRic-Atmosphere, a model built using the Met Office'sGungHo dynamical core, is able to reproduce idealised large-scale atmosphericcirculation patterns specified by several widely-used benchmark recipes. Thisis motivated by the rapid rate of exoplanet discovery and the ever-growing needfor numerical modelling and characterisation of their atmospheres. Here wepresent LFRic-Atmosphere's results for the idealised tests imitatingcirculation regimes commonly used in the exoplanet modelling community. Thebenchmarks include three analytic forcing cases: the standard Held-Suarez test,the Menou-Rauscher Earth-like test, and the Merlis-Schneider Tidally LockedEarth test. Qualitatively, LFRic-Atmosphere agrees well with other numericalmodels and shows excellent conservation properties in terms of total mass,angular momentum and kinetic energy. We then use LFRic-Atmosphere with a morerealistic representation of physical processes (radiation, subgrid-scalemixing, convection, clouds) by configuring it for the four TRAPPIST-1 HabitableAtmosphere Intercomparison (THAI) scenarios. This is the first application ofLFRic-Atmosphere to a possible climate of a confirmed terrestrial exoplanet.LFRic-Atmosphere reproduces the THAI scenarios within the spread of theexisting models across a range of key climatic variables. Our work shows thatLFRic-Atmosphere performs well in the seven benchmark tests for terrestrialatmospheres, justifying its use in future exoplanet climate studies.

Simulations of idealised 3D atmospheric flows on terrestrial planets using LFRic-Atmosphere