Model sensitivity to North Atlantic freshwater forcing at 8.2 ka
We compared four simulations of the 8.2 ka event to assess climate model sensitivity and skill in responding to North Atlantic freshwater perturbations. All of the simulations used the same freshwater forcing, 2.5 Sv for one year, applied to either the Hudson Bay (northeastern Canada) or Labrador Se...
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Language: | English |
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Copernicus Publications
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Online Access: | http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-019-882 https://doi.org/10.5194/cp-9-955-2013 |
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ftncar:oai:drupal-site.org:articles_13000 2023-09-05T13:19:53+02:00 Model sensitivity to North Atlantic freshwater forcing at 8.2 ka Morrill, C. (author) LeGrande, A. (author) Renssen, H. (author) Bakker, P. (author) Otto-Bliesner, Bette (author) 2013-04-10 application/pdf http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-019-882 https://doi.org/10.5194/cp-9-955-2013 en eng Copernicus Publications Climate of the Past http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-019-882 doi:10.5194/cp-9-955-2013 ark:/85065/d7154hzf Copyright Author(s) 2013. This work is distributed under the Creative Commons Attribution 3.0 License Text article 2013 ftncar https://doi.org/10.5194/cp-9-955-2013 2023-08-14T18:41:00Z We compared four simulations of the 8.2 ka event to assess climate model sensitivity and skill in responding to North Atlantic freshwater perturbations. All of the simulations used the same freshwater forcing, 2.5 Sv for one year, applied to either the Hudson Bay (northeastern Canada) or Labrador Sea (between Canada's Labrador coast and Greenland). This freshwater pulse induced a decadal-mean slowdown of 10–25% in the Atlantic Meridional Overturning Circulation (AMOC) of the models and caused a large-scale pattern of climate anomalies that matched proxy evidence for cooling in the Northern Hemisphere and a southward shift of the Intertropical Convergence Zone. The multi-model ensemble generated temperature anomalies that were just half as large as those from quantitative proxy reconstructions, however. Also, the duration of AMOC and climate anomalies in three of the simulations was only several decades, significantly shorter than the duration of ∼150 yr in the paleoclimate record. Possible reasons for these discrepancies include incorrect representation of the early Holocene climate and ocean state in the North Atlantic and uncertainties in the freshwater forcing estimates. Article in Journal/Newspaper Greenland Hudson Bay Labrador Sea North Atlantic OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Canada Greenland Hudson Hudson Bay Climate of the Past 9 2 955 968 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
We compared four simulations of the 8.2 ka event to assess climate model sensitivity and skill in responding to North Atlantic freshwater perturbations. All of the simulations used the same freshwater forcing, 2.5 Sv for one year, applied to either the Hudson Bay (northeastern Canada) or Labrador Sea (between Canada's Labrador coast and Greenland). This freshwater pulse induced a decadal-mean slowdown of 10–25% in the Atlantic Meridional Overturning Circulation (AMOC) of the models and caused a large-scale pattern of climate anomalies that matched proxy evidence for cooling in the Northern Hemisphere and a southward shift of the Intertropical Convergence Zone. The multi-model ensemble generated temperature anomalies that were just half as large as those from quantitative proxy reconstructions, however. Also, the duration of AMOC and climate anomalies in three of the simulations was only several decades, significantly shorter than the duration of ∼150 yr in the paleoclimate record. Possible reasons for these discrepancies include incorrect representation of the early Holocene climate and ocean state in the North Atlantic and uncertainties in the freshwater forcing estimates. |
author2 |
Morrill, C. (author) LeGrande, A. (author) Renssen, H. (author) Bakker, P. (author) Otto-Bliesner, Bette (author) |
format |
Article in Journal/Newspaper |
title |
Model sensitivity to North Atlantic freshwater forcing at 8.2 ka |
spellingShingle |
Model sensitivity to North Atlantic freshwater forcing at 8.2 ka |
title_short |
Model sensitivity to North Atlantic freshwater forcing at 8.2 ka |
title_full |
Model sensitivity to North Atlantic freshwater forcing at 8.2 ka |
title_fullStr |
Model sensitivity to North Atlantic freshwater forcing at 8.2 ka |
title_full_unstemmed |
Model sensitivity to North Atlantic freshwater forcing at 8.2 ka |
title_sort |
model sensitivity to north atlantic freshwater forcing at 8.2 ka |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-019-882 https://doi.org/10.5194/cp-9-955-2013 |
geographic |
Canada Greenland Hudson Hudson Bay |
geographic_facet |
Canada Greenland Hudson Hudson Bay |
genre |
Greenland Hudson Bay Labrador Sea North Atlantic |
genre_facet |
Greenland Hudson Bay Labrador Sea North Atlantic |
op_relation |
Climate of the Past http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-019-882 doi:10.5194/cp-9-955-2013 ark:/85065/d7154hzf |
op_rights |
Copyright Author(s) 2013. This work is distributed under the Creative Commons Attribution 3.0 License |
op_doi |
https://doi.org/10.5194/cp-9-955-2013 |
container_title |
Climate of the Past |
container_volume |
9 |
container_issue |
2 |
container_start_page |
955 |
op_container_end_page |
968 |
_version_ |
1776200674455846912 |