Combining regional mesh refinement with vertically enhanced physics to target marine stratocumulus biases as demonstrated in the Energy Exascale Earth System Model version 1

Abstract. In this paper we develop a novel framework aimed to significantly reduce biases related marine stratocumulus clouds in general circulation models (GCMs) while circumventing excessive computational cost requirements. Our strategy is increase the horizontal resolution using regionally refined mesh (RRM) over our region of interest addition Framework for Improvement by Vertical Enhancement (FIVE) vertical only specific physical processes that are important stratocumulus. We apply RRM off coast Peru southeastern Pacific, climatologically contains most subtropics. find new modeling able replicate results high-resolution benchmark simulation with much fidelity, reducing several orders magnitude. addition, greatly long-standing associated GCMs when compared standard-resolution control simulation.