The timing of deglacial circulation changes in the Atlantic
Well-dated benthic foraminifer oxygen isotopic records (delta O-18) from different water depths and locations within the Atlantic Ocean exhibit distinct patterns and significant differences in timing over the last deglaciation. This has two implications: on the one hand, it confirms that benthic del...
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ftarchimer:oai:archimer.ifremer.fr:32517 2023-05-15T17:13:52+02:00 The timing of deglacial circulation changes in the Atlantic Waelbroeck, C. Skinner, L. C. Labeyrie, L. Duplessy, J. -c. Michel, E. Vazquez Riveiros, Natalia Gherardi, J. M. Dewilde, F. 2011-08 application/pdf https://archimer.ifremer.fr/doc/00214/32517/31003.pdf https://doi.org/10.1029/2010PA002007 https://archimer.ifremer.fr/doc/00214/32517/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00214/32517/31003.pdf doi:10.1029/2010PA002007 https://archimer.ifremer.fr/doc/00214/32517/ Copyright 2011 by the American Geophysical Union. info:eu-repo/semantics/openAccess restricted use Paleoceanography (0883-8305) (Amer Geophysical Union), 2011-08 , Vol. 26 , N. PA3213 , P. 1-10 Atlantic Ocean benthic oxygen isotope last deglaciation ocean circulation text Publication info:eu-repo/semantics/article 2011 ftarchimer https://doi.org/10.1029/2010PA002007 2021-09-23T20:24:54Z Well-dated benthic foraminifer oxygen isotopic records (delta O-18) from different water depths and locations within the Atlantic Ocean exhibit distinct patterns and significant differences in timing over the last deglaciation. This has two implications: on the one hand, it confirms that benthic delta O-18 cannot be used as a global correlation tool with millennial-scale precision, but on the other hand, the combination of benthic isotopic records with independent dating provides a wealth of information on past circulation changes. Comparing new South Atlantic benthic isotopic data with published benthic isotopic records, we show that (1) circulation changes first affected benthic delta O-18 in the 1000-2200 m range, with marked decreases in benthic delta O-18 taking place at similar to 17.5 cal. kyr B.P. (ka) due to the southward propagation of brine waters generated in the Nordic Seas during Heinrich Stadial 1 (HS1) cold period; (2) the arrival of delta O-18-depleted deglacial meltwater took place later at deeper North Atlantic sites; (3) hydrographic changes recorded in North Atlantic cores below 3000 m during HS1 do not correspond to simple alternations between northern-and southern-sourced water but likely reflect instead the incursion of brine-generated deep water of northern as well as southern origin; and (4) South Atlantic waters at similar to 44 degrees S and similar to 3800 m depth remained isolated from better-ventilated northern-sourced water masses until after the resumption of North Atlantic Deep Water (NADW) formation at the onset of the Bolling-Allerod, which led to the propagation of NADW into the South Atlantic. Article in Journal/Newspaper NADW Nordic Seas North Atlantic Deep Water North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Paleoceanography 26 3 n/a n/a |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Atlantic Ocean benthic oxygen isotope last deglaciation ocean circulation |
spellingShingle |
Atlantic Ocean benthic oxygen isotope last deglaciation ocean circulation Waelbroeck, C. Skinner, L. C. Labeyrie, L. Duplessy, J. -c. Michel, E. Vazquez Riveiros, Natalia Gherardi, J. M. Dewilde, F. The timing of deglacial circulation changes in the Atlantic |
topic_facet |
Atlantic Ocean benthic oxygen isotope last deglaciation ocean circulation |
description |
Well-dated benthic foraminifer oxygen isotopic records (delta O-18) from different water depths and locations within the Atlantic Ocean exhibit distinct patterns and significant differences in timing over the last deglaciation. This has two implications: on the one hand, it confirms that benthic delta O-18 cannot be used as a global correlation tool with millennial-scale precision, but on the other hand, the combination of benthic isotopic records with independent dating provides a wealth of information on past circulation changes. Comparing new South Atlantic benthic isotopic data with published benthic isotopic records, we show that (1) circulation changes first affected benthic delta O-18 in the 1000-2200 m range, with marked decreases in benthic delta O-18 taking place at similar to 17.5 cal. kyr B.P. (ka) due to the southward propagation of brine waters generated in the Nordic Seas during Heinrich Stadial 1 (HS1) cold period; (2) the arrival of delta O-18-depleted deglacial meltwater took place later at deeper North Atlantic sites; (3) hydrographic changes recorded in North Atlantic cores below 3000 m during HS1 do not correspond to simple alternations between northern-and southern-sourced water but likely reflect instead the incursion of brine-generated deep water of northern as well as southern origin; and (4) South Atlantic waters at similar to 44 degrees S and similar to 3800 m depth remained isolated from better-ventilated northern-sourced water masses until after the resumption of North Atlantic Deep Water (NADW) formation at the onset of the Bolling-Allerod, which led to the propagation of NADW into the South Atlantic. |
format |
Article in Journal/Newspaper |
author |
Waelbroeck, C. Skinner, L. C. Labeyrie, L. Duplessy, J. -c. Michel, E. Vazquez Riveiros, Natalia Gherardi, J. M. Dewilde, F. |
author_facet |
Waelbroeck, C. Skinner, L. C. Labeyrie, L. Duplessy, J. -c. Michel, E. Vazquez Riveiros, Natalia Gherardi, J. M. Dewilde, F. |
author_sort |
Waelbroeck, C. |
title |
The timing of deglacial circulation changes in the Atlantic |
title_short |
The timing of deglacial circulation changes in the Atlantic |
title_full |
The timing of deglacial circulation changes in the Atlantic |
title_fullStr |
The timing of deglacial circulation changes in the Atlantic |
title_full_unstemmed |
The timing of deglacial circulation changes in the Atlantic |
title_sort |
timing of deglacial circulation changes in the atlantic |
publisher |
Amer Geophysical Union |
publishDate |
2011 |
url |
https://archimer.ifremer.fr/doc/00214/32517/31003.pdf https://doi.org/10.1029/2010PA002007 https://archimer.ifremer.fr/doc/00214/32517/ |
genre |
NADW Nordic Seas North Atlantic Deep Water North Atlantic |
genre_facet |
NADW Nordic Seas North Atlantic Deep Water North Atlantic |
op_source |
Paleoceanography (0883-8305) (Amer Geophysical Union), 2011-08 , Vol. 26 , N. PA3213 , P. 1-10 |
op_relation |
https://archimer.ifremer.fr/doc/00214/32517/31003.pdf doi:10.1029/2010PA002007 https://archimer.ifremer.fr/doc/00214/32517/ |
op_rights |
Copyright 2011 by the American Geophysical Union. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/2010PA002007 |
container_title |
Paleoceanography |
container_volume |
26 |
container_issue |
3 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1766071057962237952 |