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 will go from 1920 to 2080 using historical forcing (1920-2005) and RCP8.5 forcing (2005-2080). Ensemble spread will be generated using round-off differences in the initial atmospheric state. We will aim to get as many ensemble members as possible, with a stated minimum of 30. 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 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 are doing the runs. 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 detailed 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.

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, submitted to BAMS, can also be cited:

Kay, J. E., C. Deser, A. Phillips, A. Mai, C. Hannay, G. Strand, J. Arblaster, S. Bates, G. Danabasoglu, J. Edwards, M. Holland, P. Kushner, J. -F. Lamarque, D. Lawrence, K. Lindsay, A. Middleton, E. Munoz, R. Neale, K. Oleson, L. Polvani, and M. Vertenstein, 2014: The Community Earth System Model (CESM) Large Ensemble Project: A Community Resource for Studying Climate Change in the Presence of Internal Climate Variability. Bull. Amer. Met. Soc., submitted April 17, 2014.
[Article Download]

"The CESM Large Ensemble Project: A Community Resource for Studying Climate Change in the Presence of Natural Climate Variability" Overview paper of the Large Ensemble intended for BAMS. This will serve as the "official" reference for this project. It will describe the motivation for such a project, discuss how the runs were configured, and highlight some preliminary results, with the intention of advertising the Large Ensemble to the broader climate community.

Monthly, daily, and 6-hourly outputs are being saved and archived on the Earth System Grid (http://www.earthsystemgrid.org) as single variable timeseries.