"pointed out that currently there are two families of atmospheric models with quite different formulations of model physics, one represented by the general circulation models (GCMs) and the other by the cloud-resolving models (CRMs). Ideally, these two families of models should be unified so that a continuous transition of model physics from one kind to the other takes place as the resolution changes."In other words, "quite different model physics" of convection are used in high-resolution models to simulate clouds vs. the over-simplified physics of convection utilized by low-resolution global general circulation models (GCMs). The IPCC uses GCMs to create its global warming projections, and thus it is not reassuring that the primary heat transfer mechanism in the troposphere - convection - is oversimplified in these models [and thus incorrect].
Like physicists trying to devise a "grand theory of unification" between the particle and macro worlds, this paper suggests some early steps to unify the "quite different model physics" of low-resolution GCM models and high-resolution cloud-resolving models [the latter with the more accurate physics].
Prior papers have demonstrated that GCMs models are unable to simulate conventional turbulent [convective] heat flow and thereby violate the 2nd law of thermodynamics, and that IPCC global climate models do not realistically simulate convection.
Convection is the most important cooling and heat transfer mechanism in the troposphere and overwhelms or "short-circuits" so-called radiative forcing. These three papers collectively demonstrate a current inability of GCMs to properly simulate convection and thus cooling and heat transfer in the troposphere. Therefore, unless or until these problems are resolved, the IPCC global climate models cannot provide realistic projections of future warming or cooling.