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Modifications to the K-Profile Parameterization with Nondiffusive Fluxes for Langmuir Turbulence

Authors :
James C. McWilliams
Marcelo Chamecki
Tomas Chor
Source :
Journal of Physical Oceanography. 51:1503-1521
Publication Year :
2021
Publisher :
American Meteorological Society, 2021.

Abstract

The K-profile parameterization (KPP) is a common method to model turbulent fluxes in regional and global oceanic models. Many versions of KPP exist in the oceanic sciences community, and one of their main differences is how they take the effects of nonbreaking waves into account. Although there is qualitative consensus that nonbreaking waves enhance vertical mixing due to the ensuing Langmuir circulations, there is no consensus on the quantitative aspects and modeling approach. In this paper we use a recently developed method to estimate both components of KPP (the diffusive term, usually called local, and the nondiffusive component, usually called nonlocal) based on numerically simulated turbulent fluxes without any a priori assumptions about their scaling or their shape. Through this method we show that the cubic shape usually used in KPP is not optimal for wavy situations and propose new ones. Furthermore, we show that the formulation for the nondiffusive fluxes, which currently only depend on the presence of surface buoyancy fluxes, should also take wave effects into account. We also investigate how the application of these changes to KPP improves the representation of turbulent fluxes in a diagnostic approach when compared with previous models.

Details

ISSN :
15200485 and 00223670
Volume :
51
Database :
OpenAIRE
Journal :
Journal of Physical Oceanography
Accession number :
edsair.doi...........66b96c43b664961f99917e814fcbd513
Full Text :
https://doi.org/10.1175/jpo-d-20-0250.1