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

Geoscientific Model Development

article

Peter A. Bogenschutz¹  Hsiang-He Lee¹  Qi Tang¹  Takanobu Yamaguchi² 

[1] Lawrence Livermore National Laboratory;Cooperative Institute for Research in Environmental Sciences, University of Colorado;NOAA Earth System Research Laboratories, Chemical Science Laboratory

DOI  :  10.5194/gmd-16-335-2023

学科分类：土木及结构工程学

来源: Copernicus Publications

【 摘 要 】

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

【 授权许可】

CC BY