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Well-resolved air–sea interactions are simulated in a new ocean mixed-layer,coupled configuration of the Met Office Unified Model (MetUM-GOML),comprising the MetUM coupled to the Multi-Column K Profile Parameterizationocean (MC-KPP). This is the first globally coupled system which provides avertically resolved, high near-surface resolution ocean at comparablecomputational cost to running in atmosphere-only mode. As well as beingcomputationally inexpensive, this modelling framework is adaptable – theindependent MC-KPP columns can be applied selectively in space and time –and controllable – by using temperature and salinity corrections the modelcan be constrained to any ocean state.  The framework provides a powerful research tool for process-based studies ofthe impact of air–sea interactions in the global climate system. MetUMsimulations have been performed which separate the impact of introducinginterannual variability in sea surface temperatures (SSTs) from the impact ofhaving atmosphere–ocean feedbacks. The representation of key aspects oftropical and extratropical variability are used to assess the performance ofthese simulations. Coupling the MetUM to MC-KPP is shown, for example, toreduce tropical precipitation biases, improve the propagation of, andspectral power associated with, the Madden–Julian Oscillation and producecloser-to-observed patterns of springtime blocking activity over theEuro-Atlantic region

MetUM-GOML1: a near-globally coupled atmosphere–ocean-mixed-layer model