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Studying the Boundary Layer Late Afternoon nd Sunset Turbulence (BLLAST)

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Pino González, DavidMés informacióMés informacióMés informació
Lothon, Marie
Angevine, Wayne M.
Bange, Jens
Beare, R.J.
Beyrich, Frank
Canut, Guylaine
Couvreux, Fleur
Delbarre, Hervé
Gibert, Fabien
Jonker, Harm J. J.
Lenschow, Donald
Lohou, Fabienne
Mahrt, Larry
Pardyjak, Eric
Sorbjan, Zibgniew
Vilà-Guerau de Arellano, Jordi
Document typeConference lecture
Defense date2010
Rights accessOpen Access
Attribution-NonCommercial-NoDerivs 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
Abstract
At the end of the afternoon, when the surface heat fluxes start to sharply decrease, the CBL turns from a convective well-mixed layer to an intermittently turbulent residual layer overlying a stably-stratified boundary layer. This transition raises several observational and modeling issues. Even the definition of the boundary layer during this period is fuzzy, since there is no consensus on what criteria to use and no simple scaling laws to apply. Yet it plays an important role in such diverse atmospheric phenomena as transport and diffusion of trace constituents or wind energy production. This phase of the diurnal cycle remains largely unexplored, partly due to the difficulty of measuring weak and intermittent turbulence, anisotropy, horizontal heterogeneity, and rapid time changes. The Boundary Layer Late Afternoon and Sunset Turbulence (BLLAST) project is gathering about thirty research scientists from the European Union and the United States to work on this issue. A field campaign (BLLAST-FE) is planned for spring or summer 2011 in Europe. BLLAST will utilize these observations, as well as previous datasets, large-eddy and direct numerical simulations, and mesoscale modeling to better understand the processes, suggest new parameterizations, and evaluate forecast models during this transitional period. We will present the issues raised by the late afternoon transition and our strategy to study it.
CitationPino, D. [et al.]. Studying the Boundary Layer Late Afternoon nd Sunset Turbulence (BLLAST). A: Symposium on Boundary Layers and Turbulence. "Proceedings if the 19th Symposium on Boundary Layers and Turbulence". Keystone: 2010, p. 1-4. 
URIhttp://hdl.handle.net/2117/28114
Publisher versionhttp://ams.confex.com/ams/19Ag19BLT9Urban/techprogram/program_637.htm
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  • Departament de Física Aplicada (fins octubre 2015) - Ponències/Comunicacions de congressos [242]
  • DF - Dinàmica No Lineal de Fluids - Ponències/Comunicacions de congressos [107]
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