The Large-Eddy Simulation (LES) ARM Symbiotic Simulation and Observation (LASSO) datastream is now produced in an ongoing manner given the completion of the two-year pilot phase. After each shallow convection season ends at the Southern Great Plains atmospheric observatory, a set of data bundles are produced.
Currently, data bundles are available for the years 2015-2017. Bundles for 2015 and 2016 were produced as part of the pilot phase and are preliminary versions of the final product. The Alpha 1 and Alpha 2 bundles serve the purpose of demonstrating the overall LASSO concept to researchers, providing a means for facilitating community discussion and feedback, and making available initial sets of simulations and accompanying observations for research purposes. From 2017 onward, a standardized model configuration and data bundle format has been chosen that is anticipated to be stable. A history of releases and differences between then can be found in the LASSO change log.
Each release is a collection of data files, which entails a collection of what ARM calls “data bundles,” which consists of:
- LES input and outputs
- ARM observations co-registered on the model grid
- Model diagnostics and skill scores
- Data plots of various fields.
For routine operations, simulations from the Weather Research and Forecasting (WRF) model are available that have been driven using a range of forcings. This selection of forcings forms an ensemble that increases the likelihood of obtaining realistic LES simulations.
More complete details about the LES configuration and data included in the bundles are available in the associated LASSO technical documentation.
The simulations within LASSO represent the typical behavior expected from LES using best practice configurations and are valid for use in various research applications. We recommend users contact the LASSO team to ensure the details of the simulations are understood and that the simulations are used appropriately for a given application.