Simulation of the Transient Climate of the Last 21,000 Years (TraCE-21ka)

This TraCE-21ka dataset contains output from the full TraCE simulation from 22,000 years before present (22ka) to 1990 CE as well as single-forcing sensitivity simulations of varying lengths. These results are from a fully-coupled, non-accelerated atmosphere-ocean-sea ice-land surface CCSM3 simulation at the T31_gx3 resolution. For the full TraCE simulation, the model is forced with transient greenhouse gas concentrations and orbitally-driven insolation changes. Transient boundary conditions include the ICE-5G ice sheets - extent and topography, and changing paleogeography as sea level rises from its Last Glacial Maximum low stand to modern levels. We also prescribe a transient scenario of meltwater forcing to the oceans from the retreating ice sheets. Vegetation is prognostic. The following CCSM3 simulations are available: [TraCE] full TraCE simulation, with transient forcing changes in greenhouse gases, orbitally-driven insolation variations, ice sheets and meltwater fluxes. [TraCE-ORB] with only transient orbital forcing, all other forcings and boundary conditions remain at the full TraCE state of 22ka. [TraCE-GHG] with only transient greenhouse gas forcing, all other forcings and boundary conditions remain at the full TraCE state of 22ka. [TraCE-ICE] with only changing continental ice sheets, all other forcings and boundary conditions remain at the full TraCE state of 19ka. [TraCE-MWF] with only transient Northern Hemisphere meltwater fluxes, all other forcings and boundary conditions remain at the full TraCE state of 19ka. [TraCE-ORB-17ka] with only transient orbital forcing, all other forcings and boundary conditions remain at the full TraCE state of 17ka. [TraCE-GHG-17ka] with only transient greenhouse gas forcing, all other forcings and boundary conditions remain at the full TraCE state of 17ka.

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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 N/A
Additional Information N/A
Resource Format NetCDF
Standardized Resource Format NetCDF
Asset Size 6402463.289 MB
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Creative Commons Attribution 4.0 International License
Access Constraints None
Software Implementation Language N/A

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Resource Support Email datahelp@ucar.edu
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Distributor NSF NCAR Geoscience Data Exchange
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Metadata Contact Email datahelp@ucar.edu
Metadata Contact Organization NSF NCAR Geoscience Data Exchange

Author Otto-Bliesner, Bette
Rosenbloom, Nan
Publisher NSF National Center for Atmospheric Research
Publication Date 2021-08-04
Digital Object Identifier (DOI) https://doi.org/10.5065/CXB5-TV56
Alternate Identifier d651050
Resource Version N/A
Topic Category climatologyMeteorologyAtmosphere
Progress completed
Metadata Date 2025-10-09T01:37:01Z
Metadata Record Identifier edu.ucar.gdex::d651050
Metadata Language eng; USA
Suggested Citation Otto-Bliesner, Bette, Rosenbloom, Nan. (2021). Simulation of the Transient Climate of the Last 21,000 Years (TraCE-21ka). NSF National Center for Atmospheric Research. https://doi.org/10.5065/CXB5-TV56. Accessed 14 October 2025.

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