Coherent deglacial changes in western Atlantic Ocean circulation
Abrupt climate changes in the past have been attributed to variations in Atlantic Meridional Overturning Circulation (AMOC) strength. However, the exact timing and magnitude of past AMOC shifts remain elusive, which continues to limit our understanding of the driving mechanisms of such climate varia...
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Nature Publishing Group
2018
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Online Access: | https://archimer.ifremer.fr/doc/00495/60698/65409.pdf https://archimer.ifremer.fr/doc/00495/60698/65410.pdf https://archimer.ifremer.fr/doc/00495/60698/65411.pdf https://archimer.ifremer.fr/doc/00495/60698/65412.xlsx https://archimer.ifremer.fr/doc/00495/60698/65413.xlsx https://archimer.ifremer.fr/doc/00495/60698/65414.xlsx https://doi.org/10.1038/s41467-018-05312-3 https://archimer.ifremer.fr/doc/00495/60698/ |
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ftarchimer:oai:archimer.ifremer.fr:60698 2023-05-15T16:40:53+02:00 Coherent deglacial changes in western Atlantic Ocean circulation Ng, Hong Chin Robinson, Laura F. Mcmanus, Jerry F. Mohamed, Kais J. Jacobel, Allison W. Ivanovic, Ruza F. Gregoire, Lauren J. Chen, Tianyu 2018-07 application/pdf https://archimer.ifremer.fr/doc/00495/60698/65409.pdf https://archimer.ifremer.fr/doc/00495/60698/65410.pdf https://archimer.ifremer.fr/doc/00495/60698/65411.pdf https://archimer.ifremer.fr/doc/00495/60698/65412.xlsx https://archimer.ifremer.fr/doc/00495/60698/65413.xlsx https://archimer.ifremer.fr/doc/00495/60698/65414.xlsx https://doi.org/10.1038/s41467-018-05312-3 https://archimer.ifremer.fr/doc/00495/60698/ eng eng Nature Publishing Group https://archimer.ifremer.fr/doc/00495/60698/65409.pdf https://archimer.ifremer.fr/doc/00495/60698/65410.pdf https://archimer.ifremer.fr/doc/00495/60698/65411.pdf https://archimer.ifremer.fr/doc/00495/60698/65412.xlsx https://archimer.ifremer.fr/doc/00495/60698/65413.xlsx https://archimer.ifremer.fr/doc/00495/60698/65414.xlsx doi:10.1038/s41467-018-05312-3 https://archimer.ifremer.fr/doc/00495/60698/ info:eu-repo/semantics/openAccess restricted use Nature Communications (2041-1723) (Nature Publishing Group), 2018-07 , Vol. 9 , N. 2947 , P. 10p. text Publication info:eu-repo/semantics/article 2018 ftarchimer https://doi.org/10.1038/s41467-018-05312-3 2021-09-23T20:32:41Z Abrupt climate changes in the past have been attributed to variations in Atlantic Meridional Overturning Circulation (AMOC) strength. However, the exact timing and magnitude of past AMOC shifts remain elusive, which continues to limit our understanding of the driving mechanisms of such climate variability. Here we show a consistent signal of the Pa-231/Th-230 proxy that reveals a spatially coherent picture of western Atlantic circulation changes over the last deglaciation, during abrupt millennial-scale climate transitions. At the onset of deglaciation, we observe an early slowdown of circulation in the western Atlantic from around 19 to 16.5 thousand years ago (ka), consistent with the timing of accelerated Eurasian ice melting. The subsequent weakened AMOC state persists for over a millennium (similar to 16.5-15 ka), during which time there is substantial ice rafting from the Laurentide ice sheet. This timing indicates a role for melting ice in driving a two-step AMOC slowdown, with a positive feedback sustaining continued iceberg calving and climate change during Heinrich Stadial 1. Article in Journal/Newspaper Ice Sheet Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Nature Communications 9 1 |
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 |
Abrupt climate changes in the past have been attributed to variations in Atlantic Meridional Overturning Circulation (AMOC) strength. However, the exact timing and magnitude of past AMOC shifts remain elusive, which continues to limit our understanding of the driving mechanisms of such climate variability. Here we show a consistent signal of the Pa-231/Th-230 proxy that reveals a spatially coherent picture of western Atlantic circulation changes over the last deglaciation, during abrupt millennial-scale climate transitions. At the onset of deglaciation, we observe an early slowdown of circulation in the western Atlantic from around 19 to 16.5 thousand years ago (ka), consistent with the timing of accelerated Eurasian ice melting. The subsequent weakened AMOC state persists for over a millennium (similar to 16.5-15 ka), during which time there is substantial ice rafting from the Laurentide ice sheet. This timing indicates a role for melting ice in driving a two-step AMOC slowdown, with a positive feedback sustaining continued iceberg calving and climate change during Heinrich Stadial 1. |
format |
Article in Journal/Newspaper |
author |
Ng, Hong Chin Robinson, Laura F. Mcmanus, Jerry F. Mohamed, Kais J. Jacobel, Allison W. Ivanovic, Ruza F. Gregoire, Lauren J. Chen, Tianyu |
spellingShingle |
Ng, Hong Chin Robinson, Laura F. Mcmanus, Jerry F. Mohamed, Kais J. Jacobel, Allison W. Ivanovic, Ruza F. Gregoire, Lauren J. Chen, Tianyu Coherent deglacial changes in western Atlantic Ocean circulation |
author_facet |
Ng, Hong Chin Robinson, Laura F. Mcmanus, Jerry F. Mohamed, Kais J. Jacobel, Allison W. Ivanovic, Ruza F. Gregoire, Lauren J. Chen, Tianyu |
author_sort |
Ng, Hong Chin |
title |
Coherent deglacial changes in western Atlantic Ocean circulation |
title_short |
Coherent deglacial changes in western Atlantic Ocean circulation |
title_full |
Coherent deglacial changes in western Atlantic Ocean circulation |
title_fullStr |
Coherent deglacial changes in western Atlantic Ocean circulation |
title_full_unstemmed |
Coherent deglacial changes in western Atlantic Ocean circulation |
title_sort |
coherent deglacial changes in western atlantic ocean circulation |
publisher |
Nature Publishing Group |
publishDate |
2018 |
url |
https://archimer.ifremer.fr/doc/00495/60698/65409.pdf https://archimer.ifremer.fr/doc/00495/60698/65410.pdf https://archimer.ifremer.fr/doc/00495/60698/65411.pdf https://archimer.ifremer.fr/doc/00495/60698/65412.xlsx https://archimer.ifremer.fr/doc/00495/60698/65413.xlsx https://archimer.ifremer.fr/doc/00495/60698/65414.xlsx https://doi.org/10.1038/s41467-018-05312-3 https://archimer.ifremer.fr/doc/00495/60698/ |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Nature Communications (2041-1723) (Nature Publishing Group), 2018-07 , Vol. 9 , N. 2947 , P. 10p. |
op_relation |
https://archimer.ifremer.fr/doc/00495/60698/65409.pdf https://archimer.ifremer.fr/doc/00495/60698/65410.pdf https://archimer.ifremer.fr/doc/00495/60698/65411.pdf https://archimer.ifremer.fr/doc/00495/60698/65412.xlsx https://archimer.ifremer.fr/doc/00495/60698/65413.xlsx https://archimer.ifremer.fr/doc/00495/60698/65414.xlsx doi:10.1038/s41467-018-05312-3 https://archimer.ifremer.fr/doc/00495/60698/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1038/s41467-018-05312-3 |
container_title |
Nature Communications |
container_volume |
9 |
container_issue |
1 |
_version_ |
1766031310560690176 |