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European Facility For Airborne Research June 18, 2018, 17:31

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Description
Title Studying the Boundary Layer Late Afternoon and Sunset Turbulence (BLLAST)
Type Publication
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.

Available from http://www.atmos-chem-phys.net/special_issue337.html
Author
BANGE Jens
BEYRICH Frank
CANUT Guylaine
GIOLI Beniamino
JONKER Harm
LOHOU Fabienne
LOTHON Marie
MAHRT Larry
PINO David
VILA GUERAU DE ARELLANO Jordi
W. Angevine, B. Beare, F. Couvreaux, H. Delbarre, F. Gibert, D. H. Lenschow, E. Pardyjak, Z. Sorbjan
Reference
Journal Atmospheric Chemistry and Physics
Volume 14
Pages
Year 2010
Times cited 0
Institute country Spain
Type of science
  • Atmospheric dynamics (includes thermodynamics)
Field of science
  • Troposphere
File details
Added Sept. 29, 2010, 00:00
Last update Aug. 7, 2017, 08:43
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File name pino_etal_2010_20100929105548.pdf
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