GABLS3-LES Intercomparison Study

S. Basu, A.A.M. Holtslag, F.C. Bosveld

Research output: Chapter in Book/Report/Conference proceedingConference paperAcademic


Recently, a large-eddy simulation (LES) intercomparison study was organized under the auspices of the GEWEX Atmospheric Boundary Layer Study (GABLS). Eleven LES modelling groups around the world participated in this study to model a baroclinic, mid-latitude nighttime stable boundary layer utilizing several LES subgrid-scale (SGS) models. Some of the findings from this intercomparison study are unexpected, which make it quite unique. First of all, the LES-ensemble not only captures the statistics, but also the dynamical evolution of the observed variables remarkably well. Second, the diversity among the members of the ensemble is found to be surprisingly low. In other words, the simulated results (especially the first-order statistics) are not very sensitive to the LES-SGS parameterizations. Last, a relatively coarse spatial resolution of 6.25 m is shown to be adequate for representing the basic characteristics of a moderately/strongly stratified (the ratio of the boundary layer height and the Obukhov length is on the order of 5) boundary layer. In this conference paper, we discuss a subset of these findings.
Original languageEnglish
Title of host publicationProceedings of the Workshop on Diurnal cycles and the stable boundary layer, 7-10 November 2011, Reading, UK
PublisherEuropean Centre for Medium-Range Weather Forecasts
Publication statusPublished - 2012
EventWorkshop on Diurnal cycles and the stable boundary layer, Reading, UK -
Duration: 7 Nov 201110 Nov 2011


WorkshopWorkshop on Diurnal cycles and the stable boundary layer, Reading, UK


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