Equilibration and variability in a Last Glacial Maximum climate simulation with CCSM3
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 temper...
Published in: | Geophysical Research Letters |
---|---|
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Geophysical Union
2009
|
Subjects: | |
Online Access: | http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-000-503 https://doi.org/10.1029/2009GL040364 |
id |
ftncar:oai:drupal-site.org:articles_17152 |
---|---|
record_format |
openpolar |
spelling |
ftncar:oai:drupal-site.org:articles_17152 2023-09-05T13:21:26+02:00 Equilibration and variability in a Last Glacial Maximum climate simulation with CCSM3 Brandefelt, J. (author) Otto-Bliesner, Bette (author) 2009-10-13 application/pdf http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-000-503 https://doi.org/10.1029/2009GL040364 en eng American Geophysical Union Geophysical Research Letters http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-000-503 doi:10.1029/2009GL040364 ark:/85065/d7959jtf For AGU-published articles, use “An edited version of this paper was published by AGU. Copyright 2010 American Geophysical Union. Last Glacial Maximum AOGCM equilibriation Text article 2009 ftncar https://doi.org/10.1029/2009GL040364 2023-08-14T18:35:58Z 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. Article in Journal/Newspaper North Atlantic Sea ice OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Geophysical Research Letters 36 19 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
topic |
Last Glacial Maximum AOGCM equilibriation |
spellingShingle |
Last Glacial Maximum AOGCM equilibriation Equilibration and variability in a Last Glacial Maximum climate simulation with CCSM3 |
topic_facet |
Last Glacial Maximum AOGCM equilibriation |
description |
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. |
author2 |
Brandefelt, J. (author) Otto-Bliesner, Bette (author) |
format |
Article in Journal/Newspaper |
title |
Equilibration and variability in a Last Glacial Maximum climate simulation with CCSM3 |
title_short |
Equilibration and variability in a Last Glacial Maximum climate simulation with CCSM3 |
title_full |
Equilibration and variability in a Last Glacial Maximum climate simulation with CCSM3 |
title_fullStr |
Equilibration and variability in a Last Glacial Maximum climate simulation with CCSM3 |
title_full_unstemmed |
Equilibration and variability in a Last Glacial Maximum climate simulation with CCSM3 |
title_sort |
equilibration and variability in a last glacial maximum climate simulation with ccsm3 |
publisher |
American Geophysical Union |
publishDate |
2009 |
url |
http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-000-503 https://doi.org/10.1029/2009GL040364 |
genre |
North Atlantic Sea ice |
genre_facet |
North Atlantic Sea ice |
op_relation |
Geophysical Research Letters http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-000-503 doi:10.1029/2009GL040364 ark:/85065/d7959jtf |
op_rights |
For AGU-published articles, use “An edited version of this paper was published by AGU. Copyright 2010 American Geophysical Union. |
op_doi |
https://doi.org/10.1029/2009GL040364 |
container_title |
Geophysical Research Letters |
container_volume |
36 |
container_issue |
19 |
_version_ |
1776202038127886336 |