Toward a Dynamical Foundation for Organized Convection Parameterization in GCMs

A dynamically based parameterization of organized moist convection in the form of multiscale coherent structures and slantwise layer overturning principles provides upscale heat and counter‐gradient momentum transports distinct from diffusive down‐gradient mixing by unorganized cumulus. Implementation of a minimalist version of this new parameterization in a state‐of‐the‐art global climate model (GCM) improves the Madden‐Julian Oscillation and convectively coupled waves and generates large‐scale patterns of tropical precipitation consistent with Tropical Rainfall Measuring Mission satellite measurements. A question on the need to parameterize mesoscale convective organization to mitigate mean state biases is addressed.