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An Intercomparison of Large-Eddy Simulations of the Stable Boundary Layer
Authors:Robert J Beare  Malcolm K Macvean  Albert A M Holtslag  Joan Cuxart  Igor Esau  Jean-Christophe Golaz  Maria A Jimenez  Marat Khairoutdinov  Branko Kosovic  David Lewellen  Thomas S Lund  Julie K Lundquist  Anne Mccabe  Arnold F Moene  Yign Noh  Siegfried Raasch  Peter Sullivan
Institution:(1) Met Office, U.K;(2) Wageningen University, The Netherlands;(3) Universitat de les Illes Balears, Spain;(4) Nansen Environmental and Remote Sensing Center, Norway;(5) Naval Research Laboratory, National Research Council, Monterey, CA, U.S.A;(6) Colorado State University, U.S.A;(7) Lawrence Livermore National Laboratory, U.S.A;(8) West Virginia University, U.S.A;(9) Colorado Research Associates, U.S.A;(10) Yonsei University, South Korea;(11) University of Hannover, Germany;(12) National Center for Atmospheric Research, U.S.A
Abstract: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  Parametrization  Resolution  Stable boundary layer  Subgrid model
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