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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fttriple:oai:gotriple.eu:oai:doaj.org/article:5f21c0a66c9c4f16b57489446875f5d6 2023-05-15T16:29:11+02:00 Model sensitivity to North Atlantic freshwater forcing at 8.2 ka C. Morrill A. N. LeGrande H. Renssen P. Bakker B. L. Otto-Bliesner 2013-04-01 https://doi.org/10.5194/cp-9-955-2013 http://www.clim-past.net/9/955/2013/cp-9-955-2013.pdf https://doaj.org/article/5f21c0a66c9c4f16b57489446875f5d6 en eng Copernicus Publications doi:10.5194/cp-9-955-2013 1814-9324 1814-9332 http://www.clim-past.net/9/955/2013/cp-9-955-2013.pdf https://doaj.org/article/5f21c0a66c9c4f16b57489446875f5d6 undefined Climate of the Past, Vol 9, Iss 2, Pp 955-968 (2013) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2013 fttriple https://doi.org/10.5194/cp-9-955-2013 2023-01-22T19:24:51Z 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 Unknown Canada Greenland Hudson Hudson Bay Climate of the Past 9 2 955 968 |
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envir geo C. Morrill A. N. LeGrande H. Renssen P. Bakker B. L. Otto-Bliesner Model sensitivity to North Atlantic freshwater forcing at 8.2 ka |
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envir geo |
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. |
format |
Article in Journal/Newspaper |
author |
C. Morrill A. N. LeGrande H. Renssen P. Bakker B. L. Otto-Bliesner |
author_facet |
C. Morrill A. N. LeGrande H. Renssen P. Bakker B. L. Otto-Bliesner |
author_sort |
C. Morrill |
title |
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 |
https://doi.org/10.5194/cp-9-955-2013 http://www.clim-past.net/9/955/2013/cp-9-955-2013.pdf https://doaj.org/article/5f21c0a66c9c4f16b57489446875f5d6 |
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_source |
Climate of the Past, Vol 9, Iss 2, Pp 955-968 (2013) |
op_relation |
doi:10.5194/cp-9-955-2013 1814-9324 1814-9332 http://www.clim-past.net/9/955/2013/cp-9-955-2013.pdf https://doaj.org/article/5f21c0a66c9c4f16b57489446875f5d6 |
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undefined |
op_doi |
https://doi.org/10.5194/cp-9-955-2013 |
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Climate of the Past |
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9 |
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955 |
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968 |
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