GABLS

Activities

First intercomparison case: LES and 1-D

In 2003 a first bench-mark case was selected to evaluate the state of art and to compare the skills of single-column (1D) models and Large-Eddy Simulation (LES) models for the Stable Boundary Layer. More than 10 groups participated in the comparison for the LES models. For detailed results see: www.gabls.org and the paper by Beare et al.
In addition, more than 20 groups participated in the comparison of the 1D models. This includes research models and operational models from the leading weather and climate centers. For detailed results see: http://turbulencia.uib.es/gabls and the paper by Cuxart et al).
The initial model intercomparison results were presented at a workshop at the University of the Balearic Islands in Mallorca, September 22-25, 2003 A summary of the Mallorca workshop is given here .
The outcome of several studies were presented during the 16th Boundary Layers and Turbulence Conference, in Portland, August 2004. After the conference also a GABLS meeting was held with additional presentations About ten papers on the first GABLS model intercomparison has been published in a special issue of Boundary Layer Meteorology (Feb 2006)

Second intercomparison case: 1-D

A second intercomparison case for 1-D models (and perhaps later for LES models as well) has been defined. The case is inspired by observations during the CASES-99 campaign. Details can be found at this site. First results has been reported in GEWEX Newsletter.

Third intercomparison case: 1-D and LES

A third intercomparison case for 1-D models (and later for LES models as well) has been defined. The case focuses on a night with a clear low-lvel jet, and is inspired by observations from the Cabauw tower in the Netherlands. Details can be found at this site. This case is open for submissions since 1 March 2008. The first results of this intercomparison will be presented during the 18th Boundary Layers and Turbulence Conference, in Stockholm, June 2008.

Subsequently, a LES testcase has been defined which is based on the same situation as the 1-D case. Details can be found on this site. Deadline for submission of results is November 1, 2008.