Partnered with the National Center for Atmospheric Research

The CESM1 Last Millennium Ensemble Project

Wed, 09/23/2015 - 16:41 -- LukeAParsons

The CESM Paleoclimate Working Group at NCAR conducted a series of Last Millennium community experiments, referred to as the Last Millennium Ensemble (LME).  The LME used a ~2-degree atmosphere and land, ~1-degree ocean and sea ice version of CESM-CAM5_CN (1.9x2.5_gx1v6). Ensemble members extend from 850 to 2006 using reconstructions for the transient evolution of solar intensity, volcanic emissions, greenhouse gases, aerosols, land use conditions, and orbital parameters, together and individually. We have completed 30 simulations for the LME project: 10 simulations with all transient forcings, smaller ensembles with each transient forcing separately, and long 1850 and 850 control simulations. Ensemble spread is generated using round-off differences in the initial atmospheric state.

Monthly, daily, and 6-hourly outputs are saved and archived on the Earth System Grid ( as single variable timeseries. An overview paper of the Last Millennium Ensemble Project is available:  Otto-Bliesner, B.L., E.C. Brady, J. Fasullo, A. Jahn, L. Landrum, S. Stevenson, N. Rosenbloom, A. Mai, G. Strand. Climate Variability and Change since 850 C.E.: An Ensemble Approach with the Community Earth System Model (CESM), Bulletin of the American Meteorological Society (accepted 25 July 2015). [Article Download]


Bette Otto-Bliesner, John Fasullo, Samantha Stevenson, Esther Brady
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