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Subgrid-Scale Dynamics of Water Vapour, Heat, and Momentum over a Lake

Vercauteren, Nikki ; Bou-Zeid, Elie ; Parlange, Marc ; Lemmin, Ulrich ; Huwald, Hendrik ; Selker, John ; Meneveau, Charles

In: Boundary-Layer Meteorology, 2008, vol. 128, no. 2, p. 205-228

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    Titre
    • Subgrid-Scale Dynamics of Water Vapour, Heat, and Momentum over a Lake
    Auteur
    • Vercauteren, Nikki. School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne-EPFL, Lausanne, Switzerland
    • Bou-Zeid, Elie. School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne-EPFL, Lausanne, Switzerland
    • Parlange, Marc. School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne-EPFL, Lausanne, Switzerland
    • Lemmin, Ulrich. School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne-EPFL, Lausanne, Switzerland
    • Huwald, Hendrik. School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne-EPFL, Lausanne, Switzerland
    • Selker, John. Department of Biological and Ecological Engineering, Oregon State University, 97331, Corvallis, OR, USA
    • Meneveau, Charles. Department of Mechanical Engineering and Center for Environmental and Applied Fluid Mechanics, The Johns Hopkins University, 3400 N Charles St., 21218, Baltimore, MD, USA
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Boundary-Layer Meteorology, 2008, vol. 128, no. 2, p. 205-228. Springer Netherlands
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:310488
    Summary
    We examine the dynamics of turbulence subgrid (or sub-filter) scales over a lake surface and the implications for large-eddy simulations (LES) of the atmospheric boundary layer. The analysis is based on measurements obtained during the Lake-Atmosphere Turbulent EXchange (LATEX) field campaign (August-October, 2006) over Lake Geneva, Switzerland. Wind velocity, temperature and humidity profiles were measured at 20Hz using a vertical array of four sonic anemometers and open-path gas analyzers. The results indicate that the observed subgrid-scale statistics are very similar to those observed over land surfaces, suggesting that the effect of the lake waves on surface-layer turbulence during LATEX is small. The measurements allowed, for the first time, the study of subgrid-scale turbulent transport of water vapour, which is found to be well correlated with the transport of heat, suggesting that the subgrid-scale modelling of the two scalars may be coupled to save computational resources during LES