Modifying the Mixed Layer Eddy Parameterization to Include Frontogenesis Arrest by Boundary Layer Turbulence
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phoc-JPO-D-21-0297.1.pdf
Description
Published version
Size
3.12 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Bodner, Abigail S
Fox-Kemper, Baylor
Johnson, Leah
Van Roekel, Luke P
McWilliams, James C
Sullivan, Peter P
Hall, Paul S
Dong, Jihai
Date Issued
January 6, 2023
Journal
Journal of Physical Oceanography
Publisher
American Meteorological Society
Citation
Bodner, A. S., B. Fox-Kemper, L. Johnson, L. P. Van Roekel, J. C. McWilliams, P. P. Sullivan, P. S. Hall, and J. Dong, 2023: Modifying the Mixed Layer Eddy Parameterization to Include Frontogenesis Arrest by Boundary Layer Turbulence. J. Phys. Oceanogr., 53, 323–339.
Version
Final published version
Abstract
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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DOI of Published Version
https://doi.org/10.1175/JPO-D-21-0297.1
