A Model Study of the Atlantic Thermohaline Circulation During the Last Glacial Maximum
STABLE isotope measurements in deep-sea sediment cores have indicated that the Atlantic thermohaline circulation experienced significant changes during the last glacial maximum: the North Atlantic Deep Water (NADW) was shallower than today and the Antarctic Bottom Water (AABW) penetrated much farthe...
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Macmillan Magazines Ltd
1994
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Online Access: | http://hdl.handle.net/2078.1/48600 https://doi.org/10.1038/372252a0 |
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ftunistlouisbrus:oai:dial.uclouvain.be:boreal:48600 2024-05-12T07:56:15+00:00 A Model Study of the Atlantic Thermohaline Circulation During the Last Glacial Maximum Fichefet, Thierry Hovine, S. Duplessy, JC. UCL - SC/PHYS - Département de physique UCL - SST/ELI/ELIC - Earth & Climate 1994 http://hdl.handle.net/2078.1/48600 https://doi.org/10.1038/372252a0 eng eng Macmillan Magazines Ltd boreal:48600 http://hdl.handle.net/2078.1/48600 doi:10.1038/372252a0 urn:ISSN:0028-0836 urn:EISSN:1476-4687 Nature : international weekly journal of science, Vol. 372, no. 6503, p. 252-255 (1994) info:eu-repo/semantics/article 1994 ftunistlouisbrus https://doi.org/10.1038/372252a0 2024-04-18T18:13:11Z STABLE isotope measurements in deep-sea sediment cores have indicated that the Atlantic thermohaline circulation experienced significant changes during the last glacial maximum: the North Atlantic Deep Water (NADW) was shallower than today and the Antarctic Bottom Water (AABW) penetrated much farther north(1-6). Numerical ocean models have, so far, been unable to simulate these circulation changes realistically(7). Here we show that a zonally averaged, three-basin ocean model, driven by glacial boundary conditions(8-10), reproduces the main trends of the geochemically constrained glacial Atlantic circulation. In addition, we provide quantitative estimates of the meridional water transport during glacial times. Our results suggest that the glacial production of AABW was slightly higher than at present, whereas that of NADW was reduced by similar to 40%, resulting in an intermediate circulation cell which closed within the Atlantic basin. We also show that the strength of the Atlantic conveyor belt strongly depends on the surface density contrast between the high latitudes of the Northern and Southern hemispheres. Article in Journal/Newspaper Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic DIAL@USL-B (Université Saint-Louis, Bruxelles) Antarctic The Antarctic Nature 372 6503 252 255 |
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Open Polar |
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DIAL@USL-B (Université Saint-Louis, Bruxelles) |
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ftunistlouisbrus |
language |
English |
description |
STABLE isotope measurements in deep-sea sediment cores have indicated that the Atlantic thermohaline circulation experienced significant changes during the last glacial maximum: the North Atlantic Deep Water (NADW) was shallower than today and the Antarctic Bottom Water (AABW) penetrated much farther north(1-6). Numerical ocean models have, so far, been unable to simulate these circulation changes realistically(7). Here we show that a zonally averaged, three-basin ocean model, driven by glacial boundary conditions(8-10), reproduces the main trends of the geochemically constrained glacial Atlantic circulation. In addition, we provide quantitative estimates of the meridional water transport during glacial times. Our results suggest that the glacial production of AABW was slightly higher than at present, whereas that of NADW was reduced by similar to 40%, resulting in an intermediate circulation cell which closed within the Atlantic basin. We also show that the strength of the Atlantic conveyor belt strongly depends on the surface density contrast between the high latitudes of the Northern and Southern hemispheres. |
author2 |
UCL - SC/PHYS - Département de physique UCL - SST/ELI/ELIC - Earth & Climate |
format |
Article in Journal/Newspaper |
author |
Fichefet, Thierry Hovine, S. Duplessy, JC. |
spellingShingle |
Fichefet, Thierry Hovine, S. Duplessy, JC. A Model Study of the Atlantic Thermohaline Circulation During the Last Glacial Maximum |
author_facet |
Fichefet, Thierry Hovine, S. Duplessy, JC. |
author_sort |
Fichefet, Thierry |
title |
A Model Study of the Atlantic Thermohaline Circulation During the Last Glacial Maximum |
title_short |
A Model Study of the Atlantic Thermohaline Circulation During the Last Glacial Maximum |
title_full |
A Model Study of the Atlantic Thermohaline Circulation During the Last Glacial Maximum |
title_fullStr |
A Model Study of the Atlantic Thermohaline Circulation During the Last Glacial Maximum |
title_full_unstemmed |
A Model Study of the Atlantic Thermohaline Circulation During the Last Glacial Maximum |
title_sort |
model study of the atlantic thermohaline circulation during the last glacial maximum |
publisher |
Macmillan Magazines Ltd |
publishDate |
1994 |
url |
http://hdl.handle.net/2078.1/48600 https://doi.org/10.1038/372252a0 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic |
op_source |
Nature : international weekly journal of science, Vol. 372, no. 6503, p. 252-255 (1994) |
op_relation |
boreal:48600 http://hdl.handle.net/2078.1/48600 doi:10.1038/372252a0 urn:ISSN:0028-0836 urn:EISSN:1476-4687 |
op_doi |
https://doi.org/10.1038/372252a0 |
container_title |
Nature |
container_volume |
372 |
container_issue |
6503 |
container_start_page |
252 |
op_container_end_page |
255 |
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1798836232714715136 |