Tests of Parameterized Langmuir Circulation Mixing in the Oceans Surface Mixed Layer II
NAVAL RESEARCH LAB WASHINGTON DC WASHINGTON United States
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Recent large-eddy simulations LES of Langmuir circulation LC within the surface mixed layer SML of the ocean found that LC can significantly increase the rate of mixing within the SML and sometimes increase the mixed layer depth MLD. This report investigates the parameterization of the effects of LC on upper-ocean mixing presented in Kantha and Clayson 2004 and Harcourt 2015. These parameterizations of the enhancement of upper-ocean mixing by LC were implemented in the version of the Mellor-Yamada Level 2.5 MYL2.5 turbulence model used in the Navy Coastal Ocean Model NCOM and tested for a a simple wind-mixing case, b simulations of the upper ocean thermal structure at Ocean Weathership Station OWS Papa, and c simulations of Hurricane Ivan in the Gulf of Mexico. Results with the Kantha and Clayson 2004 and Harcourt 2015 LC mixing parameterizations are compared with each other and with NCOMs original MYL2.5 turbulence model without a LC mixing parameterization.
- Physical and Dynamic Oceanography