Synchronous Deglacial Overturning and Water Mass Source Changes
Understanding changes in ocean circulation during the last deglaciation is crucial to unraveling the dynamics of glacial-interglacial and millennial climate shifts. We used neodymium isotope measurements on postdepositional iron-manganese oxide coatings precipitated on planktonic foraminifera to rec...
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ftcolumbiauniv:oai:academiccommons.columbia.edu:10.7916/D8M90KPQ 2023-05-15T17:31:52+02:00 Synchronous Deglacial Overturning and Water Mass Source Changes Roberts, Natalie L. Piotrowski, Alexander M. McManus, Jerry F. Keigwin, Lloyd D. 2010 https://doi.org/10.7916/D8M90KPQ English eng https://doi.org/10.7916/D8M90KPQ Oceanography Paleoclimatology Articles 2010 ftcolumbiauniv https://doi.org/10.7916/D8M90KPQ 2019-04-04T08:09:48Z Understanding changes in ocean circulation during the last deglaciation is crucial to unraveling the dynamics of glacial-interglacial and millennial climate shifts. We used neodymium isotope measurements on postdepositional iron-manganese oxide coatings precipitated on planktonic foraminifera to reconstruct changes in the bottom water source of the deep western North Atlantic at the Bermuda Rise. Comparison of our deep water source record with overturning strength proxies shows that both the deep water mass source and the overturning rate shifted rapidly and synchronously during the last deglacial transition. In contrast, any freshwater perturbation caused by Heinrich event 1 could have only affected shallow overturning. These findings show how changes in upper-ocean overturning associated with millennial-scale events differ from those associated with whole-ocean deglacial climate events. Article in Journal/Newspaper North Atlantic Planktonic foraminifera Columbia University: Academic Commons |
institution |
Open Polar |
collection |
Columbia University: Academic Commons |
op_collection_id |
ftcolumbiauniv |
language |
English |
topic |
Oceanography Paleoclimatology |
spellingShingle |
Oceanography Paleoclimatology Roberts, Natalie L. Piotrowski, Alexander M. McManus, Jerry F. Keigwin, Lloyd D. Synchronous Deglacial Overturning and Water Mass Source Changes |
topic_facet |
Oceanography Paleoclimatology |
description |
Understanding changes in ocean circulation during the last deglaciation is crucial to unraveling the dynamics of glacial-interglacial and millennial climate shifts. We used neodymium isotope measurements on postdepositional iron-manganese oxide coatings precipitated on planktonic foraminifera to reconstruct changes in the bottom water source of the deep western North Atlantic at the Bermuda Rise. Comparison of our deep water source record with overturning strength proxies shows that both the deep water mass source and the overturning rate shifted rapidly and synchronously during the last deglacial transition. In contrast, any freshwater perturbation caused by Heinrich event 1 could have only affected shallow overturning. These findings show how changes in upper-ocean overturning associated with millennial-scale events differ from those associated with whole-ocean deglacial climate events. |
format |
Article in Journal/Newspaper |
author |
Roberts, Natalie L. Piotrowski, Alexander M. McManus, Jerry F. Keigwin, Lloyd D. |
author_facet |
Roberts, Natalie L. Piotrowski, Alexander M. McManus, Jerry F. Keigwin, Lloyd D. |
author_sort |
Roberts, Natalie L. |
title |
Synchronous Deglacial Overturning and Water Mass Source Changes |
title_short |
Synchronous Deglacial Overturning and Water Mass Source Changes |
title_full |
Synchronous Deglacial Overturning and Water Mass Source Changes |
title_fullStr |
Synchronous Deglacial Overturning and Water Mass Source Changes |
title_full_unstemmed |
Synchronous Deglacial Overturning and Water Mass Source Changes |
title_sort |
synchronous deglacial overturning and water mass source changes |
publishDate |
2010 |
url |
https://doi.org/10.7916/D8M90KPQ |
genre |
North Atlantic Planktonic foraminifera |
genre_facet |
North Atlantic Planktonic foraminifera |
op_relation |
https://doi.org/10.7916/D8M90KPQ |
op_doi |
https://doi.org/10.7916/D8M90KPQ |
_version_ |
1766129689443696640 |