CESM1 (CAM5) Large Ensemble Community Project

The CESM community is coordinating the production of a large ensemble using a 1-degree version of CESM1(CAM5) (0.9x1.25_gx1v6, IPCC AR5 model). Clara Deser (cdeser at ucar.edu) and Jennifer Kay (Jennifer.E.Kay at colorado.edu) are leading the planning effort on behalf of the community. Ensemble members go from 1920 to 2100 using historical forcing (1920-2005) and RCP8.5 forcing (2006-2100). Ensemble spread is generated using round-off differences in the initial atmospheric state. We are aiming to get 40 ensemble members, to expand on the 33 members already completed at NCAR and the 5 members completed at the University of Toronto.  Companion multi-century pre-industrial (1850) control runs with varying degrees of atmosphere-ocean coupling are also available: fully coupled (1800 years), slab ocean (TBD years), and atmosphere-only (2600 years).

Data from the CESM1(CAM5) Large Ensemble 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 CESM1(CAM5) 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 CESM1(CAM5) 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 CESM1(CAM5) Large Ensemble either in oral or written form, please acknowledge the CESM1(CAM5) 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