Single Column Model Evaluations of Mixing Length Formulations and Constraints for the sa-TKE-EDMF Scheme

Strobach, Edward

doi:10.25923/0sv0-4916

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Single Column Model Evaluations of Mixing Length Formulations and Constraints for the sa-TKE-EDMF Scheme

2021
By Strobach, Edward
Series: Office note (National Centers for Environmental Prediction (U.S.)) ; 504

[PDF-1.55 MB]

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Personal Author:

Strobach, Edward
Corporate Authors:

United States. National Weather Service. ; National Centers for Environmental Prediction (U.S.)

United States. National Weather Service. ; National Centers for Environmental Prediction (U.S.) Less -
NOAA Program & Office:

NWS (National Weather Service) ; NCEP (National Centers for Environmental Prediction)

NWS (National Weather Service) ; NCEP (National Centers for Environmental Prediction) Less -
Description:

Parameterizing boundary layer turbulence is a critical component of numerical weather prediction and the representation of turbulent mixing of momentum, heat, and other tracers. The components that make up a boundary layer scheme can vary considerably, with each scheme having a combination of processes that are physically represented along with tuning parameters that optimize performance. Isolating a component of a PBL scheme to examine its impact is essential for understanding the evolution of boundary layer profiles and their impact on the mean structure. In this study we conduct three experiments with the sa-TKE-EDMF scheme: 1) releasing the upper limit constraints placed on mixing lengths, 2) incrementally adjusting the tuning coefficient related to wind shear in BouLac mixing length formulation, 3) replacing the current mixing length formulations with those used in the MYNN scheme. A diagnostic approach is adopted to characterize the bulk representation of turbulence within the residual layer and boundary layer in order to understand the importance of different terms in the TKE budget as well as to assess how the balance of terms changes between mixing length formulations. Although our study does not seek to determine the best formulation, it was found that strong imbalances led to considerably different profile structures, both in terms of the resolved and subgrid fields, that led to undesirable results. Experiments where this balance was preserved shows a minor impact on the mean structure regardless of the turbulence generated. Overall, it was found that changes to mixing length formulations and/or constraints had stronger impacts during the day while remaining partially insensitive during the evening.
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Boundary Layer (Meteorology) Evaluation Mathematical Models Numerical Weather Forecasting
Series:

Office note (National Centers for Environmental Prediction (U.S.)) ; 504
DOI:

https://doi.org/10.25923/0sv0-4916
Document Type:

Office Note
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Public Domain
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Submitted
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urn:sha256:102a8c08d6233e96298b0b55fb63819947670c1bd8a2e285a75a58782ffff2a5
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https://repository.library.noaa.gov/view/noaa/29281/noaa_29281_DS1.pdf
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Single Column Model Evaluations of Mixing Length Formulations and Constraints for the sa-TKE-EDMF Scheme

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