Early Holocene Laurentide Ice Sheet deglaciation causes cooling in the high-latitude Southern Hemisphere through oceanic teleconnection
The impact of the early Holocene Laurentide Ice Sheet (LIS) deglaciation on the climate at Southern Hemisphere high latitudes is studied in three transient simulations performed with a global climate model of the coupled atmosphere-ocean-vegetation system. Considering the LIS deglaciation, we quanti...
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ftvliz:oai:oma.vliz.be:211458 2023-05-15T13:33:16+02:00 Early Holocene Laurentide Ice Sheet deglaciation causes cooling in the high-latitude Southern Hemisphere through oceanic teleconnection Renssen, H. Goosse, H. Crosta, X. Roche, D.M. 2010 http://www.vliz.be/nl/open-marien-archief?module=ref&refid=211458 en eng info:eu-repo/semantics/altIdentifier/wos/000280338500001 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1029/2009PA001854 http://www.vliz.be/nl/open-marien-archief?module=ref&refid=211458 info:eu-repo/semantics/restrictedAccess %3Ci%3EPaleoceanography+25%3C%2Fi%3E.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1029%2F2009PA001854%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1029%2F2009PA001854%3C%2Fa%3E info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2010 ftvliz https://doi.org/10.1029/2009PA001854 2022-05-01T09:40:42Z The impact of the early Holocene Laurentide Ice Sheet (LIS) deglaciation on the climate at Southern Hemisphere high latitudes is studied in three transient simulations performed with a global climate model of the coupled atmosphere-ocean-vegetation system. Considering the LIS deglaciation, we quantify separately the impacts of the background meltwater fluxes and the changes in topography and surface albedo. In our model, the meltwater input into the North Atlantic results in a substantial weakening of the Atlantic meridional overturning circulation, associated with absence of deep convection in the Labrador Sea. Northward ocean heat transport by the Atlantic Ocean is reduced by 28%. This weakened ocean circulation leads to cooler North Atlantic Deep Water (NADW). Upwelling of this cool NADW in the Southern Ocean results in reduced surface temperatures (by 1°C to 2°C) here between 9 and 7 ka compared to an experiment without LIS deglaciation. Poleward of the polar front zone, this advective teleconnection between the Southern and Northern hemispheres overwhelms the effect of the "classical" bipolar seesaw mechanism. These results provide an explanation for the relatively cold climatic conditions between 9 and 7 ka reconstructed in several proxy records from Southern Hemisphere high latitudes, such as Antarctic ice cores. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Labrador Sea NADW North Atlantic Deep Water North Atlantic Southern Ocean Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) Antarctic Southern Ocean Paleoceanography 25 3 |
institution |
Open Polar |
collection |
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) |
op_collection_id |
ftvliz |
language |
English |
description |
The impact of the early Holocene Laurentide Ice Sheet (LIS) deglaciation on the climate at Southern Hemisphere high latitudes is studied in three transient simulations performed with a global climate model of the coupled atmosphere-ocean-vegetation system. Considering the LIS deglaciation, we quantify separately the impacts of the background meltwater fluxes and the changes in topography and surface albedo. In our model, the meltwater input into the North Atlantic results in a substantial weakening of the Atlantic meridional overturning circulation, associated with absence of deep convection in the Labrador Sea. Northward ocean heat transport by the Atlantic Ocean is reduced by 28%. This weakened ocean circulation leads to cooler North Atlantic Deep Water (NADW). Upwelling of this cool NADW in the Southern Ocean results in reduced surface temperatures (by 1°C to 2°C) here between 9 and 7 ka compared to an experiment without LIS deglaciation. Poleward of the polar front zone, this advective teleconnection between the Southern and Northern hemispheres overwhelms the effect of the "classical" bipolar seesaw mechanism. These results provide an explanation for the relatively cold climatic conditions between 9 and 7 ka reconstructed in several proxy records from Southern Hemisphere high latitudes, such as Antarctic ice cores. |
format |
Article in Journal/Newspaper |
author |
Renssen, H. Goosse, H. Crosta, X. Roche, D.M. |
spellingShingle |
Renssen, H. Goosse, H. Crosta, X. Roche, D.M. Early Holocene Laurentide Ice Sheet deglaciation causes cooling in the high-latitude Southern Hemisphere through oceanic teleconnection |
author_facet |
Renssen, H. Goosse, H. Crosta, X. Roche, D.M. |
author_sort |
Renssen, H. |
title |
Early Holocene Laurentide Ice Sheet deglaciation causes cooling in the high-latitude Southern Hemisphere through oceanic teleconnection |
title_short |
Early Holocene Laurentide Ice Sheet deglaciation causes cooling in the high-latitude Southern Hemisphere through oceanic teleconnection |
title_full |
Early Holocene Laurentide Ice Sheet deglaciation causes cooling in the high-latitude Southern Hemisphere through oceanic teleconnection |
title_fullStr |
Early Holocene Laurentide Ice Sheet deglaciation causes cooling in the high-latitude Southern Hemisphere through oceanic teleconnection |
title_full_unstemmed |
Early Holocene Laurentide Ice Sheet deglaciation causes cooling in the high-latitude Southern Hemisphere through oceanic teleconnection |
title_sort |
early holocene laurentide ice sheet deglaciation causes cooling in the high-latitude southern hemisphere through oceanic teleconnection |
publishDate |
2010 |
url |
http://www.vliz.be/nl/open-marien-archief?module=ref&refid=211458 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Ice Sheet Labrador Sea NADW North Atlantic Deep Water North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Sheet Labrador Sea NADW North Atlantic Deep Water North Atlantic Southern Ocean |
op_source |
%3Ci%3EPaleoceanography+25%3C%2Fi%3E.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1029%2F2009PA001854%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1029%2F2009PA001854%3C%2Fa%3E |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/000280338500001 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1029/2009PA001854 http://www.vliz.be/nl/open-marien-archief?module=ref&refid=211458 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1029/2009PA001854 |
container_title |
Paleoceanography |
container_volume |
25 |
container_issue |
3 |
_version_ |
1766040660551401472 |