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Title
E3SM with first implementation of mesoscale convective system parameterization
Authors
Chih-Chieh-Jack Chen, Jadwiga H. Richter, Changhai Liu, Mitchell Moncrieff
Abstract
Transport of momentum throughout the atmosphere in large part controls the global circulation, and hence moisture and precipitation patterns. However, several momentum transport processes occur on scales much smaller than a global circulation model (GCM) grid box, and hence have to be parameterized. E3SMv1 currently employs a parameterization of subgrid momentum transport within convection, however it is completely missing the effects of convective organization on the global circulation. Mesoscale convective systems, such as squall lines and mesoscale convective systems can alter the momentum, heat and moisture budgets. We implemented a multiscale coherant structure parameterization (MCSP) into E3SMv1. In this first implementation, we only consider changes to the convective heating profile by organized mesoscale convection. We show the effects of the MCSP on the simulation of mean precipitation and variability in E3SMv1.