Aquaplanet Experiments Using CAM’s Variable-Resolution Dynamical Core
Colin M. Zarzycki,Michael Levy,Christiane Jablonowski,James Overfelt,Mark A. Taylor,Paul A. Ullrich +5 more
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TL;DR: In this article, the effect of mesh refinement in a climate model by running variable-resolution (var-res) simulations on an aquaplanet has been investigated, and the results show that global cloud fraction decreases and equatorial precipitation increases with finer horizontal resolution, resulting in drastically different climates between the uniform grid runs and a physics induced grid imprinting in the var-res simulation.
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Abstract: A variable-resolution option has been added within the spectral element (SE) dynamical core of the U.S. Department of Energy (DOE)–NCAR Community Atmosphere Model (CAM). CAM-SE allows for static refinement via conforming quadrilateral meshes on the cubed sphere. This paper investigates the effect of mesh refinement in a climate model by running variable-resolution (var-res) simulations on an aquaplanet. The variable-resolution grid is a 2° (~222 km) grid with a refined patch of 0.25° (~28 km) resolution centered at the equator. Climatology statistics from these simulations are compared to globally uniform runs of 2° and 0.25°.A significant resolution dependence exists when using the CAM version 4 (CAM4) subgrid physical parameterization package across scales. Global cloud fraction decreases and equatorial precipitation increases with finer horizontal resolution, resulting in drastically different climates between the uniform grid runs and a physics-induced grid imprinting in the var-res simulation...
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