An Intercomparison of Large-Eddy Simulations of the Stable Boundary Layer
Beare, R.J. ; MacVean, M.K. ; Holtslag, A.A.M. ; Cuxart, J. ; Esau, I. ; Golaz, J.C. ; Jimenez, M.A. ; Khairoutdinov, M. ; Kosovic, B. ; Lewellen, D. ; Lund, T.S. ; Lundquist, J.K. ; McCabe, A. ; Moene, A.F. ; Noh, Y. ; Raasch, S. ; Sullivan, P. - \ 2006
Boundary-Layer Meteorology 118 (2006)2. - ISSN 0006-8314 - p. 247 - 272.
shallow cumulus convection - subgrid model - sensitivity - surface - transition - resolution - turbulence - mesoscale - cases-99 - fluxes
Results are presented from the first intercomparison of large-eddy simulation (LES) models for the stable boundary layer (SBL), as part of the Global Energy and Water Cycle Experiment Atmospheric Boundary Layer Study initiative. A moderately stable case is used, based on Arctic observations. All models produce successful simulations, in as much as they generate resolved turbulence and reflect many of the results from local scaling theory and observations. Simulations performed at 1-m and 2-m resolution show only small changes in the mean profiles compared to coarser resolutions. Also, sensitivity to subgrid models for individual models highlights their importance in SBL simulation at moderate resolution (6.25 m). Stability functions are derived from the LES using typical mixing lengths used in numerical weather prediction (NWP) and climate models. The functions have smaller values than those used in NWP. There is also support for the use of K-profile similarity in parametrizations. Thus, the results provide improved understanding and motivate future developments of the parametrization of the SBL. Keywords Large-eddy simulation
Single-Column Model Intercomparison for a Stably Stratified Atmospheric Boundary Layer
Cuxart, J. ; Holtslag, A.A.M. ; Beare, R.J. ; Bazile, E. ; Beljaars, A. ; Cheng, A. ; Conangla, L. ; Ek, M.B. ; Freedman, F. ; Hamdi, R. ; Kerstein, A. ; Kitagawa, H. ; Lenderink, G. ; Lewellen, D. ; Mailhot, J. ; Mauritsen, T. ; Perov, V. ; Schayes, G. ; Steeneveld, G.J. ; Svensson, G. ; Taylor, P. ; Weng, W. ; Wunsch, S. ; Xu, K.M. - \ 2006
Boundary-Layer Meteorology 118 (2006)2. - ISSN 0006-8314 - p. 273 - 303.
turbulence closure-model - large-eddy simulation - part i - scheme - parameterization - formulation - diffusion - dynamics - surfaces - system
The parameterization of the stably stratified atmospheric boundary layer is a difficult issue, having a significant impact on medium-range weather forecasts and climate integrations. To pursue this further, a moderately stratified Arctic case is simulated by nineteen single-column turbulence schemes. Statistics from a large-eddy simulation intercomparison made for the same case by eleven different models are used as a guiding reference. The single-column parameterizations include research and operational schemes from major forecast and climate research centres. Results from first-order schemes, a large number of turbulence kinetic energy closures, and other models were used. There is a large spread in the results; in general, the operational schemes mix over a deeper layer than the research schemes, and the turbulence kinetic energy and other higher-order closures give results closer to the statistics obtained from the large-eddy simulations. The sensitivities of the schemes to the parameters of their turbulence closures are partially explored
Entrainment into sheared convective boundary layers as predicted by different large eddy simulation codes
Fedorovich, E. ; Conzemius, R. ; Esau, I. ; Katopodes Chow, F. ; Lewellen, D. ; Moeng, C.H. ; Sullivan, P. ; Pino, D. ; Vilà-Guerau de Arellano, J. - \ 2004
In: 16th Symposium on Boundary Layers and Turbulence, 9-13 August, Portland, Maine / McGillis, W.R., Bach, Jr., W.D., Boston : American Meteorological Society - p. P4.7 - P4.7.
An intercomparison of large-eddy simulations of the stable boundary layer
Beare, R. ; MacVean, M. ; Holtslag, A.A.M. ; Cuxart, J. ; Esau, I. ; Golaz, J.C. ; Jimenez, M. ; Khairoutdinov, M. ; Kosovic, B. ; Lewellen, D. ; Lund, T. ; Lundquist, J. ; McCabe, A. ; Moene, A.F. ; Noh, Y. ; Raasch, S. ; Sullivan, P. - \ 2004
In: 16th Symposium on Boundary Layers and Turbulence, 9-13 August 2004, Portland, Maine / McGillis, W.R., Bach, Jr., W.D., Boston : American Meteorological Society - p. 4.1 - 4.1.