Experiments

CESM1 (CAM5) Large Ensemble Community Project

The CESM community is coordinating the production of a large ensemble using a 1-degree version of CESM-CAM5 (0.9x1.25_gx1v6, IPCC AR5 model). Ensemble members go from 1920 to 2100 using historical forcing (1920-2005) and RCP8.5 forcing (2005-2100). Ensemble spread is generated using round-off differences in the initial atmospheric state. We are aiming to get as many ensemble members as possible, to expand on the 30 members already completed. Monthly, daily, and 6-hourly outputs are being saved and archived on the Earth System Grid (http://www.earthsystemgrid.org) as single variable timeseries.

The CESM-CAM5 large ensemble project is a community project. Output from the ensemble members are available to any scientist who is interested. Clara Deser (cdeser at ucar.edu) and Jennifer Kay (jenkay at ucar.edu) at NCAR are leading the planning effort on behalf of the community. Adrianne Middleton and Andy Mai complete the 30 NCAR ensemble members. Substantial computing resources for the project were awarded as a part of the CESM community CSL allocation on Yellowstone. Additional ensemble members are being provided by university collaborators. Please contact us if you can contribute additional ensemble members. More historical coordination and planning information can be found at our wiki. Please sign up on our mailing list for future updates.

If you are interested in analyzing the CESM-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.

A list of publications using the Large Ensemble can be found here. If you would like to add a publication to this list, please contact webhelp@cgd.ucar.edu. When presenting results 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 (in press), 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 
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