Timing of the descent into the last Ice Age determined by the bipolar seesaw
We present planktonic foraminiferal fauna and isotope records from the SE Atlantic that highlight the nature of millennial-scale variability over the last 100 kyr. We derive a hypothesis-driven age model for our records based on the empirical link between variations in Greenland temperature, ocean c...
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Language: | English |
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Amer Geophysical Union
2014
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Online Access: | https://archimer.ifremer.fr/doc/00290/40129/38753.pdf https://archimer.ifremer.fr/doc/00290/40129/38754.docx https://archimer.ifremer.fr/doc/00290/40129/38755.xlsx https://archimer.ifremer.fr/doc/00290/40129/38756.pdf https://doi.org/10.1002/2014PA002623 https://archimer.ifremer.fr/doc/00290/40129/ |
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ftarchimer:oai:archimer.ifremer.fr:40129 2023-05-15T16:29:28+02:00 Timing of the descent into the last Ice Age determined by the bipolar seesaw Barker, Stephen Diz, Paula 2014-06-11 application/pdf https://archimer.ifremer.fr/doc/00290/40129/38753.pdf https://archimer.ifremer.fr/doc/00290/40129/38754.docx https://archimer.ifremer.fr/doc/00290/40129/38755.xlsx https://archimer.ifremer.fr/doc/00290/40129/38756.pdf https://doi.org/10.1002/2014PA002623 https://archimer.ifremer.fr/doc/00290/40129/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00290/40129/38753.pdf https://archimer.ifremer.fr/doc/00290/40129/38754.docx https://archimer.ifremer.fr/doc/00290/40129/38755.xlsx https://archimer.ifremer.fr/doc/00290/40129/38756.pdf doi:10.1002/2014PA002623 https://archimer.ifremer.fr/doc/00290/40129/ 2014. The Authors info:eu-repo/semantics/openAccess restricted use Paleoceanography (0883-8305) (Amer Geophysical Union), 2014-06-11 , Vol. 29 , N. 6 , P. 489-507 text Publication info:eu-repo/semantics/article 2014 ftarchimer https://doi.org/10.1002/2014PA002623 2021-09-23T20:26:50Z We present planktonic foraminiferal fauna and isotope records from the SE Atlantic that highlight the nature of millennial-scale variability over the last 100 kyr. We derive a hypothesis-driven age model for our records based on the empirical link between variations in Greenland temperature, ocean circulation, and carbonate preservation in the deep SE Atlantic. Our results extend earlier findings of an antiphase (seesaw) relationship between north and south for the largest abrupt events of Marine Isotope Stage (MIS) 3-2 and the last deglaciation. In particular, we find that Heinrich Stadials were paralleled by inferred southward shifts of the thermal Subtropical Front. These were followed by pronounced rebounds of the front with the return to interstadial conditions in the north. Our results also shed light on the mechanism of glaciation. In contrast to the last deglaciation, which was a globally symmetric change superposed by interhemispheric asynchronicity, we find that the descent into full glacial conditions at the onset of MIS 4 (similar to 70 ka) displayed interhemispheric synchrony. We suggest that this globally synchronous descent into glacial MIS 4 was preconditioned by orbital changes, but the timing was ultimately determined by abrupt changes in ocean/atmosphere circulation patterns i.e., the bipolar seesaw. Article in Journal/Newspaper Greenland Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Greenland Paleoceanography 29 6 489 507 |
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 |
description |
We present planktonic foraminiferal fauna and isotope records from the SE Atlantic that highlight the nature of millennial-scale variability over the last 100 kyr. We derive a hypothesis-driven age model for our records based on the empirical link between variations in Greenland temperature, ocean circulation, and carbonate preservation in the deep SE Atlantic. Our results extend earlier findings of an antiphase (seesaw) relationship between north and south for the largest abrupt events of Marine Isotope Stage (MIS) 3-2 and the last deglaciation. In particular, we find that Heinrich Stadials were paralleled by inferred southward shifts of the thermal Subtropical Front. These were followed by pronounced rebounds of the front with the return to interstadial conditions in the north. Our results also shed light on the mechanism of glaciation. In contrast to the last deglaciation, which was a globally symmetric change superposed by interhemispheric asynchronicity, we find that the descent into full glacial conditions at the onset of MIS 4 (similar to 70 ka) displayed interhemispheric synchrony. We suggest that this globally synchronous descent into glacial MIS 4 was preconditioned by orbital changes, but the timing was ultimately determined by abrupt changes in ocean/atmosphere circulation patterns i.e., the bipolar seesaw. |
format |
Article in Journal/Newspaper |
author |
Barker, Stephen Diz, Paula |
spellingShingle |
Barker, Stephen Diz, Paula Timing of the descent into the last Ice Age determined by the bipolar seesaw |
author_facet |
Barker, Stephen Diz, Paula |
author_sort |
Barker, Stephen |
title |
Timing of the descent into the last Ice Age determined by the bipolar seesaw |
title_short |
Timing of the descent into the last Ice Age determined by the bipolar seesaw |
title_full |
Timing of the descent into the last Ice Age determined by the bipolar seesaw |
title_fullStr |
Timing of the descent into the last Ice Age determined by the bipolar seesaw |
title_full_unstemmed |
Timing of the descent into the last Ice Age determined by the bipolar seesaw |
title_sort |
timing of the descent into the last ice age determined by the bipolar seesaw |
publisher |
Amer Geophysical Union |
publishDate |
2014 |
url |
https://archimer.ifremer.fr/doc/00290/40129/38753.pdf https://archimer.ifremer.fr/doc/00290/40129/38754.docx https://archimer.ifremer.fr/doc/00290/40129/38755.xlsx https://archimer.ifremer.fr/doc/00290/40129/38756.pdf https://doi.org/10.1002/2014PA002623 https://archimer.ifremer.fr/doc/00290/40129/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Paleoceanography (0883-8305) (Amer Geophysical Union), 2014-06-11 , Vol. 29 , N. 6 , P. 489-507 |
op_relation |
https://archimer.ifremer.fr/doc/00290/40129/38753.pdf https://archimer.ifremer.fr/doc/00290/40129/38754.docx https://archimer.ifremer.fr/doc/00290/40129/38755.xlsx https://archimer.ifremer.fr/doc/00290/40129/38756.pdf doi:10.1002/2014PA002623 https://archimer.ifremer.fr/doc/00290/40129/ |
op_rights |
2014. The Authors info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1002/2014PA002623 |
container_title |
Paleoceanography |
container_volume |
29 |
container_issue |
6 |
container_start_page |
489 |
op_container_end_page |
507 |
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1766019176970846208 |