A large eddy simulation intercomparison study of shallow cumulus convection

This paper reports an intercomparison study on undisturbed trade wind cumulus convection under steady-state conditions as observed during the Barbados Oceanographic and Meteorological Experiment (BOMEX) with 10 large eddy simulation (LES) models. A main objective of this study is to obtain a quantitative assessment of the quality of the turbulent dynamics for this type of boundary layer clouds as produced by the different LES codes. A 6-h simulation shows excellent model-to-model agreement of the observed vertical thermodynamical structure, reasonable agreement of variances and turbulent fluxes, and good agreement of quantities conditionally sampled within the model clouds, such as cloud cover, liquid water, and cloud updraft strength. In the second part of this paper the LES dataset is used to evaluate simple models that are used in parameterizations of current general circulation models (GCMs). Finally, the relation of this work to subsequent LES studies of more complicated regimes is discussed, and guidance is given for the design of future observational studies of shallow cumulus boundary layers.

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Copyright 2003 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be "fair use" under Section 107 of the U.S. Copyright Act or that satisfies the conditions specified in Section 108 of the U.S. Copyright Act (17 USC ยง108, as revised by P.L. 94-553) does not require the AMS's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statement, requires written permission or a license form the AMS. Additional details are provided in the AMS Copyright Policy, available on the AMS Web site located at (http://www.ametsoc.org/AMS) or from the AMS at 617-227-2425 or copyright@ametsoc.org.
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Author Siebesma, A.
Bretherton, Christopher
Brown, Andrew
Chlond, Andreas
Cuxart, Joan
Duynkerke, Peter
Jiang, Hongli
Khairoutdinov, Marat
Lewellen, David
Moeng, Chin-Hoh
Sanchez, Enrique
Stevens, Bjorn
Stevens, David
Publisher UCAR/NCAR - Library
Publication Date 2003-05-15T00:00:00
Digital Object Identifier (DOI) Not Assigned
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Topic Category geoscientificInformation
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Metadata Date 2023-08-18T18:10:08.277454
Metadata Record Identifier edu.ucar.opensky::articles:17608
Metadata Language eng; USA
Suggested Citation Siebesma, A., Bretherton, Christopher, Brown, Andrew, Chlond, Andreas, Cuxart, Joan, Duynkerke, Peter, Jiang, Hongli, Khairoutdinov, Marat, Lewellen, David, Moeng, Chin-Hoh, Sanchez, Enrique, Stevens, Bjorn, Stevens, David. (2003). A large eddy simulation intercomparison study of shallow cumulus convection. UCAR/NCAR - Library. http://n2t.net/ark:/85065/d78w3fm5. Accessed 23 April 2024.

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