CESM1 Last Millennium Ensemble

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 CESM1 (CAM5). 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 36 simulations for the LME project: 13 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 available.

More information about this dataset can be found on the CESM1 Last Millennium Ensemble Project website [https://www.cesm.ucar.edu/community-projects/lme].

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Keywords

Resource Type dataset
Temporal Range Begin N/A
Temporal Range End N/A
Temporal Resolution N/A
Bounding Box North Lat N/A
Bounding Box South Lat N/A
Bounding Box West Long N/A
Bounding Box East Long N/A
Spatial Representation N/A
Spatial Resolution N/A
Related Links

Related Resource #1 : CESM1 Last Millennium Ensemble Project
Additional Information N/A
Resource Format NetCDF
Standardized Resource Format NetCDF
Asset Size 519811903.0 MB
Legal Constraints

Creative Commons Attribution 4.0 International License
Access Constraints None
Software Implementation Language N/A

Resource Support Name N/A
Resource Support Email datahelp@ucar.edu
Resource Support Organization
Distributor NSF NCAR Geoscience Data Exchange

Metadata Contact Name N/A
Metadata Contact Email datahelp@ucar.edu
Metadata Contact Organization NSF NCAR Geoscience Data Exchange

Author Otto-Bliesner, Bette L. ORCID icon
Brady, Esther C. ORCID icon
Fasullo, John T. ORCID icon
Jahn, Alexandra ORCID icon
Landrum, Laura L. ORCID icon
Stevenson, Samantha ORCID icon
Rosenbloom, Nan A. ORCID icon
Mai, Andrew
Strand, Gary
Publisher NSF National Center for Atmospheric Research

Publication Date 2025-07-03
Digital Object Identifier (DOI) https://doi.org/10.5065/C32Y-RK84
Alternate Identifier d651058
Resource Version N/A
Topic Category climatologyMeteorologyAtmosphere
Progress completed
Metadata Date 2026-04-20T04:03:52Z
Metadata Record Identifier edu.ucar.gdex::d651058
Metadata Language eng; USA
Suggested Citation Otto-Bliesner, Bette L., Brady, Esther C., Fasullo, John T., Jahn, Alexandra, Landrum, Laura L., Stevenson, Samantha, Rosenbloom, Nan A., Mai, Andrew, Strand, Gary. (2025). CESM1 Last Millennium Ensemble. NSF National Center for Atmospheric Research. https://doi.org/10.5065/C32Y-RK84. Accessed 21 April 2026.

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