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A moist idealized test case (MITC) for atmospheric model dynamical cores ispresented. The MITC is based on the Held–Suarez (HS) test that was developedfor dry simulations on “a flat Earth” and replaces the full physicalparameterization package with a Newtonian temperature relaxation and Rayleighdamping of the low-level winds. This new variant of the HS test includesmoisture and thereby sheds light on the nonlinear dynamics–physics moisturefeedbacks without the complexity of full-physics parameterization packages.In particular, it adds simplified moist processes to the HS forcing to modellarge-scale condensation, boundary-layer mixing, and the exchange of latentand sensible heat between the atmospheric surface and an ocean-coveredplanet. Using a variety of dynamical cores of the National Center for Atmospheric Research (NCAR)'s Community Atmosphere Model (CAM), this paper demonstrates that the inclusion of the moistidealized physics package leads to climatic states that closely resembleaquaplanet simulations with complex physical parameterizations. Thisestablishes that the MITC approach generates reasonable atmosphericcirculations and can be used for a broad range of scientific investigations.This paper provides examples of two application areas. First, the test casereveals the characteristics of the physics–dynamics coupling technique andreproduces coupling issues seen in full-physics simulations. In particular,it is shown that sudden adjustments of the prognostic fields due to moistphysics tendencies can trigger undesirable large-scale gravity waves, whichcan be remedied by a more gradual application of the physical forcing.Second, the moist idealized test case can be used to intercompare dynamicalcores. These examples demonstrate the versatility of the MITC approach andsuggestions are made for further application areas. The new moist variant ofthe HS test can be considered a test case of intermediate complexity

A moist aquaplanet variant of the Held–Suarez test for atmospheric model dynamical cores