DCMIP2016: the splitting supercell test case

摘要: Abstract. This paper describes the splitting supercell idealized test case used in 2016 Dynamical Core Model Intercomparison Project (DCMIP2016). These storms are useful beds for global atmospheric models because the horizontal scale of convective plumes is O(1 km), emphasizing non-hydrostatic dynamics. The case simulates a on a reduced-radius sphere with nominal resolutions ranging from 4 to 0.5 km and based on work Klemp et al. ( 2015 ) . Models initialized an atmospheric environment conducive formation forced a small thermal perturbation. A simplified Kessler microphysics scheme is coupled dynamical core represent moist processes. Reference solutions DCMIP2016 presented. Storm evolution broadly similar between models, although differences final solution exist. These differences hypothesized result different numerical discretizations, physics–dynamics coupling, numerical diffusion. Intramodel solutions generally converge as approach 0.5 km resolution, exploratory simulations at 0.25 km imply some dynamical cores require more refinement fully converge. These results can be used as a reference future evaluation, particularly the development non-hydrostatic intended in convective-permitting regimes.