Experimental micrometeorology in an era of turbulence simulation |
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Authors: | J. C. Wyngaard L. J. Peltier |
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Affiliation: | (1) Department of Meteorology, Pennsylvania State University, 503 Walker Building, 16802-5013 University Park, PA, USA;(2) Department of Mechanical Engineering, Pennsylvania State University, 503 Walker Building, 16802-5013 University Park, PA, USA |
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Abstract: | Micrometeorologists have traditionally used the framework of the ensemble mean, fluctuating decomposition in studying turbulence spectra, Reynolds-flux budgets, surface-exchange relations, and the universal functions of Monin-Obukhov similarity within the constant-flux layer. More recently, the growth in supercomputers and computational fluid dynamics has stimulated micrometeorological applications of large-eddy simulation (LES). LES uses a different framework, one based on the resolvable, subgrid-scale decomposition. This framework shift seems to have weakened the vital and historically strong coupling between experimental and computational work in micrometeorology. A challenge for experimentalists today is to address problems posed in the language of the resolvable, subgrid-scale decomposition. We illustrate by discussing measurement strategies for resolvable-scale turbulence fields and for local surface-exchange coefficients. |
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