LASSO Alpha 2 Release


Update April 30, 2018: The Alpha 2 release has been updated to include runs released originally in the Alpha 1 release.

The Alpha 2 release is the second, and final, early data release for the LASSO pilot phase. Alpha 2 builds upon Alpha 1 through improved large-eddy simulation models (LES), increased use of observations for evaluating the model, and testing of incorporation of ARM wind profiles in the data assimilation process.

Simulations are carried out for both classical shallow convection days as well as borderline shallow convection days to better understand the overall LES model and forcing capabilities for the SGP region. Complete details regarding differences between Alpha 1 and Alpha 2 can be found in Appendix B of the Alpha 2 documentation Alpha 2 documentation. A spreadsheet containing the complete list of simulations included in the Alpha 2 release is also available.

This release contains 544 simulations from 13 shallow convection days during spring–summer 2016. Simulations are packaged alongside corresponding model-observation comparisons for different LES models, large-scale forcings, model configurations, and preliminary observational products that the LASSO team is using to assess workflow options for use in operations.

Alpha 2 data bundles can be accessed via both Data Discovery and the Bundle Browser. The latter is designed specifically for LASSO and is more efficient for most researchers seeking LASSO data. The browser includes the ability to query for specific simulations and then provides links to data plots for each simulation and links to request delivery of the data bundles.

We recommend users contact the LASSO team for the details of the simulations and guidance for specific application.

Citing Alpha 2

To cite the Alpha 2 documentation, ARM suggests the following:

Gustafson WI, AM Vogelmann, X Cheng, S Endo, B Krishna, Z Li, T Toto, and H Xiao. 2017. Description of the LASSO Alpha 2 Release. Ed. by Robert Stafford, ARM Research Facility. DOE/SC-ARM-TR-199. doi:10.2172/1376727.

To cite the Alpha 2 data set, use:

Atmospheric Radiation Measurement (ARM) Research Facility. September 2017. LASSO Alpha 2 Data Bundles. <insert date range used of the data>, 36° 36′ 18.0″ N, 97° 29′ 6.0″ W: Southern Great Plains Central Facility (C1). Compiled by WI Gustafson, AM Vogelmann, X Cheng, S Endo, B Krishna, Z Li, T Toto, and H Xiao. ARM Data Center: Oak Ridge, Tennessee, USA. Data set accessed <insert date downloaded from the web> at

For a more specific citation for the LASSO data or you would like help generating your citation, go to the ARM Data Discovery home page and click “Citation Generator” or see doi guidance for datastreams.