CESM1 (CAM5) Large Ensemble Community Project

The CESM Large Ensemble Project is a publically available set of climate model simulations useful for studying internal climate variability and climate change. The project includes a 38-member initial-condition ensemble covering the period 1920-2100 using a fully-coupled model, and multi-century pre-industrial control simulations using atmosphere, slab-ocean, and full-coupled model versions. All simulations use the 1-degree latitude/longitude version of CESM1(CAM5) (0.9x1.25_gx1v6). The 38-member ensemble uses historical radiative forcing for the period 1920-2005 and RCP8.5 radiative forcing thereafter. Ensemble spread is generated using round-off differences in the initial atmospheric state. The companion control runs use constant pre-industrial (1850) radiative forcing. The fully-coupled control is 2200 years in length (years 400-2200 are available), the atmosphere-only control is 2600 years (all years are available), and the atmosphere-slab ocean control is 900 years long (all years are available). Project leaders are Dr. Clara Deser (cdeser at ucar.edu) and Dr. Jennifer Kay (Jennifer.E.Kay at colorado.edu). Five of the ensemble members were produced at the University of Toronto under the supervision of Dr. Paul Kushner.

Data from the project are publicly available to any scientist who is interested. Monthly, daily, and 6-hourly outputs have been saved as single variable timeseries. The 6-hourly data are only available during three periods: 1990-2005, 2026-2035, 2071-2080. All data are available from the Earth System Grid (http://www.earthsystemgrid.org). For Yellowstone users, a subset of the data is available on glade:  /glade/p/cesmLE/CESM-CAM5-BGC-LE.  All output variables are available on the HPSS: /CCSM/csm/CESM-CAM5-BGC-LE.  All restarts are available on the HPSS: /CCSM/csm/$CASENAME. A list of the output variables saved is available: http://www2.cesm.ucar.edu/models/experiments/LENS/data-sets

If you are interested in analyzing the CESM Large Ensemble, we kindly ask that you provide a short description of your proposed research focus and your contact information. Please send this information to Adam Phillips (asphilli at ucar.edu) so that other users can see what projects are underway. A list of projects can be found here: http://www2.cesm.ucar.edu/models/experiments/LENS/projects.

A list of publications using the CESM Large Ensemble can be found here: http://www2.cesm.ucar.edu/models/experiments/LENS/publications. If you would like to add a publication to this list, please contact Adam Phillips (asphilli at ucar.edu). When presenting results based on the CESM Large Ensemble either in oral or written form, please acknowledge the CESM Large Ensemble Community Project and supercomputing resources provided by NSF/CISL/Yellowstone. An overview paper of the Large Ensemble Project should be cited as follows:

 Kay, J. E., Deser, C., Phillips, A., Mai, A., Hannay, C., Strand, G., Arblaster, J., Bates, S., Danabasoglu, G., Edwards, J., Holland, M. Kushner, P., Lamarque, J.-F., Lawrence, D., Lindsay, K., Middleton, A., Munoz, E., Neale, R., Oleson, K., Polvani, L., and M. Vertenstein (2015), The Community Earth System Model (CESM) Large Ensemble Project: A Community Resource for Studying Climate Change in the Presence of Internal Climate Variability, Bulletin of the American Meteorological Society, doi: 10.1175/BAMS-D-13-00255.1, in press, http://journals.ametsoc.org/doi/abs/10.1175/BAMS-D-13-00255.1