edu.ucar.opensky::articles:17152 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T15:00:14.201288 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7959jtf Equilibration and variability in a Last Glacial Maximum climate simulation with CCSM3 2009-10-13T00:00:00Z publication https://n2t.org/ark:/85065/d7959jtf https://doi.org/10.1029/2009GL040364 Brandefelt, J. author Otto-Bliesner, Bette author UCAR/NCAR - Library publisher We present results from a 1862 year simulation of the Last Glacial Maximum (LGM) with the Community Climate System Model version 3 (CCSM3). A quasi steady state is reached after approximately 100 years of integration when the initial cooling trend in the annual global mean atmospheric surface temperature (T_s) levels off and even reverses. After another 150 years of integration the climate continues to cool and reaches a new equilibrium after a total of 800 years of integration. The cause of the continued adjustment of the climate to LGM forcing and boundary conditions is found in the abyssal ocean which is cooling at a rate decreasing from 0.15°C per century until the new equilibrium is reached. The new equilibrium differs substantially from the first quasi steady state with 1.1°C colder global mean T_s and regional differences of 5–15°C in the North Atlantic region and a 30% reduction of the strength of the Atlantic meridional overturning circulation (AMOC). Further, the variability in the global mean T_s is significantly larger in the new equilibrium. This variability is associated with coupled ocean–atmosphere–sea ice variations in the North Atlantic region. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication For AGU-published articles, use "An edited version of this paper was published by AGU. Copyright 2010 American Geophysical Union. None eng geoscientificInformation