Modifying the Mixed Layer Eddy Parameterization to Include Frontogenesis Arrest by Boundary Layer Turbulence

ABIGAIL S. BODNER; BAYLOR FOX-KEMPER; LEAH JOHNSONLUKE P. VAN ROEKELJAMES C. MCWILLIAMSPETER P. SULLIVANPAUL S. HALLJIHAI DONG

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Modifying the Mixed Layer Eddy Parameterization to Include Frontogenesis Arrest by Boundary Layer Turbulence

机译：Modifying the Mixed Layer Eddy Parameterization to Include Frontogenesis Arrest by Boundary Layer Turbulence

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Current submesoscale restratification parameterizations, which help set mixed layer depth in global climate models, depend on a simplistic scaling of frontal width shown to be unreliable in several circumstances. Observations and theory indicate that frontogenesis is common, but stable frontal widths arise in the presence of turbulence and instabilities that participate in keeping fronts at the scale observed, the arrested scale. Here we propose a new scaling law for arrested frontal width as a function of turbulent fluxes via the turbulent thermal wind (TTW) balance. A variety of large-eddy simulations (LES) of strain-induced fronts and TTW-induced filaments are used to evaluate this scaling. Frontal width given by boundary layer parameters drawn from observations in the General Ocean Turbulence Model (GOTM) are found qualitatively consistent with the observed range in regions of active submesoscales. The new arrested front scaling is used to modify the mixed layer eddy restratification parameterization commonly used in coarse-resolution climate models. Results in CESM-POP2 reveal the climate model's sensitivity to the parameterization update and changes in model biases. A comprehensive multimodel study is in planning for further testing.

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《Journal of physical oceanography》 |2023年第1期|323-339|共17页
作者
ABIGAIL S. BODNER; BAYLOR FOX-KEMPER; LEAH JOHNSONLUKE P. VAN ROEKELJAMES C. MCWILLIAMSPETER P. SULLIVANPAUL S. HALLJIHAI DONG;
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School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China,Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, Guangdong, China;

Department of Earth, Environmental and Planetary Sciences, Brown University, Providence, Rhode Island;

Applied Physics Laboratory, University of Washington, Seattle, WashingtonTheoretical Division, Fluid Dynamics and Solid Mechanics, Los Alamos National Laboratory, Los Alamos, New MexicoDepartment of Atmospheric and Oceanic Sciences, University of California, Los Angeles, Los Angeles, CaliforniaNational Center for Atmospheric Research, Boulder, ColoradoDepartment of Earth, Environmental and Planetary Sciences, Brown University, Providence, Rhode Island, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, Guangdong, China;

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正文语种英语
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Ocean dynamics; Turbulence; Oceanic mixed layer; Ocean models;

Modifying the Mixed Layer Eddy Parameterization to Include Frontogenesis Arrest by Boundary Layer Turbulence

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