Exploring Viscosity Space in an Eddy?Permitting Global Ocean Model: Is Viscosity a Useful Control for Numerical Mixing?
نویسندگان
چکیده
A generic shortcoming of constant-depth (or “z-coordinate”) ocean models such as MOM5 and Nucleus for European Models the Ocean (NEMO) is a tendency advection scheme to produce unphysical numerical diapycnal mixing, which may exceed explicitly parameterized mixing based on observed physical processes. Megann (2018, https://doi.org/10.1016/j.ocemod.2017.11.001) estimated effective diffusivity in Global Version 5.0 (GO5.0) 0.25° global implementation NEMO model showed that this was up 10 times explicit used model's argued at least partly caused by large transient vertical velocities length scales comparable horizontal grid scale. The current UK configuration GO6, Coupled Model version 3.1 (GC3.1) Earth System (UKESM1), integrated forced mode resolution with range viscosity parameterizations. In present study, evaluated each integration compared value from scheme, well control (using default viscosity). It shown there strong correspondence between lower enhanced larger viscosities lead marked reduction unrealistic internal temperature drift seen configuration, without incurring excessive damping large-scale circulation, mixed layer depths, or sea ice cover. results presented here will inform choices made configurations climate following sixth Intercomparison Project (CMIP6).
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ژورنال
عنوان ژورنال: Journal of Advances in Modeling Earth Systems
سال: 2021
ISSN: ['1942-2466']
DOI: https://doi.org/10.1029/2020ms002263