Time Evolution and Diurnal Variability of the Parametric Sensitivity of Turbine-Height Winds in the MYNN-EDMF Parameterization

Berg, L. K.; Liu, Y.; Yang, Ben; Qian, Y.; Krishnamurthy, R.; Sheridan, L.; Olson, J.

doi:10.1029/2020JD034000

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Time Evolution and Diurnal Variability of the Parametric Sensitivity of Turbine-Height Winds in the MYNN-EDMF Parameterization

2021
By Berg, L. K. ; Liu, Y. ; Yang, Ben ; ...
Source: Journal of Geophysical Research-Atmospheres, 126(11)

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Journal Title:

Journal of Geophysical Research-Atmospheres
Personal Author:

Berg, L. K. ; Liu, Y. ; Yang, Ben ; Qian, Y. ; Krishnamurthy, R. ; ... More +

Berg, L. K. ; Liu, Y. ; Yang, Ben ; Qian, Y. ; Krishnamurthy, R. ; Sheridan, L. ; Olson, J. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; GSL (Global Systems Laboratory)

OAR (Oceanic and Atmospheric Research) ; GSL (Global Systems Laboratory) Less -
Description:

The Mellor-Yamada-Nakanishi-Niino (MYNN) parameterization applied in the Weather Research and Forecasting (WRF) model has been augmented to include the Eddy-Diffusion Mass-Flux (EDMF) approach to better represent transport by boundary-layer eddies. This change includes the addition of new parameters associated with convective updrafts and boundary-layer clouds that lead to new parametric sensitivities in the turbine-height wind speed compared to simulations using the standard MYNN parameterization. This work builds on efforts focused on WRF's MYNN parameterization by examining the sensitivity of wind speed to parameters in the MYNN-EDMF parameterization as a function of simulation duration. Summer and winter periods were selected from the second Wind Forecast Improvement Project (WFIP2). Five sets of simulations were completed for each season, with durations ranging from 2 to 6 days. The results show that the sensitivity to the new parameters associated with the EDMF scheme is generally small compared to other parameters in clear conditions, but the sensitivity to the entrainment becomes significant when the updraft fraction is large. The spread in the perturbed parameter ensembles was found to grow quickly over the first 8-19 h in the summer simulations and 17-24 h in the winter simulations with little change after that, regardless of the simulation length. A strong diurnal cycle in the parameter sensitivity was also found associated with the atmospheric stability, as well as an increase in the sensitivity to the entrainment parameter used in the EDMF parameterization that is associated with increasing fractional area covered by plumes.
Keywords:

[+]

Closure-model Cold-air Pool Eddy-diffusivity/Mass-flux Forecasts Framework Meteorology & Atmospheric Sciences MYNN-EDMF Planetary Boundary-layer Turbine-height Winds Turbulence Uncertainty Quantification Weather Research WRF Wrf Model Yamada Level-3 Model
Source:

Journal of Geophysical Research-Atmospheres, 126(11)
DOI:

https://doi.org/10.1029/2020JD034000
Document Type:

Journal Article
Place as Subject:

Alaska ; Arctic regions

Alaska ; Arctic regions Less -
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urn:sha256:a9cf5586faa71350b8052ee75f5353dc6260dcac309f89978dffc6256b5c1cb7
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https://repository.library.noaa.gov/view/noaa/30976/noaa_30976_DS1.pdf
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Time Evolution and Diurnal Variability of the Parametric Sensitivity of Turbine-Height Winds in the MYNN-EDMF Parameterization

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