Earth System Grid
at NCAR

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


ERROR
Cookies must be enabled.

traCE domain

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.

More details of the boundary conditions can be found on the TraCE homepage.

TraCE-21ka Homepage

Specific details on ice sheets, timing and location of meltwater forcing, and opening of ocean gateways can be found here:

TraCE-21ka Detailed Overview

Publication acknowledgement:

TraCE-21ka was made possible by the DOE INCITE computing program, and supported by NCAR, the NSF P2C2 program, and the DOE Abrupt Change and EaSM programs.

Download TraCE Data

Main TraCE dataset

TraCE-ORB

TraCE-GHG

TraCE-ICE

TraCE-MWF

TraCE-ORB-17ka

TraCE-GHG-17ka