Performance analysis of WRF and LES in describing the evolution and structure of the planetary boundary layer

Cuchiara, G. C.; Rappenglück, Bernhard

doi:10.1007/s10652-018-9597-5

Cited by 7 publications

(3 citation statements)

References 46 publications

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“…The outermost domain, D1, is configured with a horizontal resolution of 27 km; the second domain, D2, with 9 km; D3 with 3 km; and lastly, the innermost domain, D4, presents a resolution of 1 km, covering the Sierra de Guadarrama and a large area of the provinces of Madrid and Segovia. This allows for representing orography at a very high resolution of 1 km, slightly beyond the limit of the turbulent eddy scales [22]. The WRF model was initialised as a cold start at 0 hours every day and was run for 48 h, using a temporal step of 120 s, storing every hour output.…”

Section: Wrf Model Simulationsmentioning

confidence: 99%

An Assessment of Observed and Simulated Temperature Variability in Sierra de Guadarrama

et al. 2020

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This work provides a first assessment of temperature variability at interannual and decadal timescales in Sierra de Guadarrama, a high mountain protected area of the Central System in the Iberian Peninsula. Observational data from stations located in the area and simulated data from a high-resolution simulation (1 km) with the Weather Research and Forecasting (WRF) model, fed from ERA Interim reanalysis, are used in order to analyse the temperature variability in the period 2000–2018. Comparison among all datasets allows evaluation of the realism of the model simulations. The results show that the model tends to underestimate the observational mean temperatures and anomalies at high-altitude stations. A linear mean temperature vertical gradient of −5.81 °C/km is observed, but it is overestimated by the model (−6.56 °C/km). The variability of the daily temperature anomalies for both observations and, to a lesser extent, simulations increases with height. The added value that the WRF offers against the use of the ERA Interim is evaluated. The results show that the WRF provides a better performance than the reanalysis, as it shows smaller biases with respect to observational temperature anomalies. Finally, the study of temperature trends over the Sierra de Guadarrama and its surroundings for the period 2000–2018 shows a warming in the area, significantly pronounced in autumn. When extended to the last decades, observations show that this warming has been happening since the first half of the 20th century, especially during the period 1970–2018, but not as much as during 2000–2018.

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Section: Wrf Model Simulationsmentioning

confidence: 99%

An Assessment of Observed and Simulated Temperature Variability in Sierra de Guadarrama

et al. 2020

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“…Studies (e.g., Moeng et al [7], Mirocha et al [9], Kirkil et al [10]) have used WRF-LES in idealized conditions for convective ABLs and showed that WRF-LES can capture most of the turbulent features occurring at microscale. Talbot et al [11], Chu et al [12] and Cuchiara and Rappenglück [13] have used nesting approach in WRF to simulate a realistic ABL by downscaling from a grid spacing of 10 km (mesoscale) to 100 m (WRF-LES). Talbot et al [11] and Cuchiara and Rappenglück [13] have further reduced the horizontal grid resolution to 50 m, whereas Chu et al [12] showed that WRF-LES works reasonably with the resolution of 100 m.…”

Section: Introductionmentioning

confidence: 99%

“…Talbot et al [11], Chu et al [12] and Cuchiara and Rappenglück [13] have used nesting approach in WRF to simulate a realistic ABL by downscaling from a grid spacing of 10 km (mesoscale) to 100 m (WRF-LES). Talbot et al [11] and Cuchiara and Rappenglück [13] have further reduced the horizontal grid resolution to 50 m, whereas Chu et al [12] showed that WRF-LES works reasonably with the resolution of 100 m.…”

Section: Introductionmentioning

confidence: 99%

Performance Assessment of Dynamic Downscaling of WRF to Simulate Convective Conditions during Sagebrush Phase 1 Tracer Experiments

Bhimireddy

Bhaganagar

2018

Atmosphere

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Large-Eddy Simulations (LES) corresponding to four convective intensive observation periods of Sagebrush Phase 1 tracer experiment were conducted with realistic boundary conditions using Weather Research and Forecast model (WRF). Multiple nested domains were used to dynamically downscale the conditions from domain with grid size of 24 km to local scales with grid size of 150 m. Sensitivity analysis of mesoscale model was conducted using three boundary layer, three surface layer and two micro-physics schemes. Model performance was evaluated by comparing the surface meteorological variables and boundary layer height from the mesoscale runs and observed values during tracer experiment. Output from mesoscale simulations was used to drive the LES domains. Effect of vertical resolution and sub-grid scale parameterizations were studied by comparing the wind speed and direction profiles along with turbulent kinetic energy at two different heights. Atmospheric stability estimated using the Richardson number and shear exponent evaluated between 8- and 60-m levels was found to vary between weakly unstable to unstable. Comparing the wind direction standard deviations coupled with the wind speeds showed that the WRF-LES underestimated the wind direction fluctuations for wind speeds smaller than 3-ms − 1 . Based on the strengths of convection and shear, WRF-LES was able to simulate horizontal convection roll and convective cell type features.

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Multiscale modelling of planetary boundary layer flow over complex terrain: implementation under near-neutral conditions

Zhao

Xiao

et al. 2021

Environ Fluid Mech

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Performance analysis of WRF and LES in describing the evolution and structure of the planetary boundary layer

Cited by 7 publications

References 46 publications

An Assessment of Observed and Simulated Temperature Variability in Sierra de Guadarrama

An Assessment of Observed and Simulated Temperature Variability in Sierra de Guadarrama

Performance Assessment of Dynamic Downscaling of WRF to Simulate Convective Conditions during Sagebrush Phase 1 Tracer Experiments

Multiscale modelling of planetary boundary layer flow over complex terrain: implementation under near-neutral conditions

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