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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Online Access: | https://doi.org/10.5194/cp-9-955-2013 https://doaj.org/article/5f21c0a66c9c4f16b57489446875f5d6 |
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ftdoajarticles:oai:doaj.org/article:5f21c0a66c9c4f16b57489446875f5d6 2023-05-15T16:29:23+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 2013-04-01T00:00:00Z https://doi.org/10.5194/cp-9-955-2013 https://doaj.org/article/5f21c0a66c9c4f16b57489446875f5d6 EN eng Copernicus Publications http://www.clim-past.net/9/955/2013/cp-9-955-2013.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-9-955-2013 1814-9324 1814-9332 https://doaj.org/article/5f21c0a66c9c4f16b57489446875f5d6 Climate of the Past, Vol 9, Iss 2, Pp 955-968 (2013) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2013 ftdoajarticles https://doi.org/10.5194/cp-9-955-2013 2022-12-31T10:05:20Z 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 Directory of Open Access Journals: DOAJ Articles Hudson Bay Canada Greenland Hudson Climate of the Past 9 2 955 968 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 C. Morrill A. N. LeGrande H. Renssen P. Bakker B. L. Otto-Bliesner Model sensitivity to North Atlantic freshwater forcing at 8.2 ka |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
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 https://doaj.org/article/5f21c0a66c9c4f16b57489446875f5d6 |
geographic |
Hudson Bay Canada Greenland Hudson |
geographic_facet |
Hudson Bay Canada Greenland Hudson |
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 |
http://www.clim-past.net/9/955/2013/cp-9-955-2013.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-9-955-2013 1814-9324 1814-9332 https://doaj.org/article/5f21c0a66c9c4f16b57489446875f5d6 |
op_doi |
https://doi.org/10.5194/cp-9-955-2013 |
container_title |
Climate of the Past |
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9 |
container_issue |
2 |
container_start_page |
955 |
op_container_end_page |
968 |
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1766019071493537792 |