Can We Better Constrain the Timing of GNAIW/UNADW Variability in the Western Equatorial Atlantic and Its Relationship to Climate Change During the Last Deglaciation?
We have revisited the well-trod VM28-122 core retrieved from the deep Colombian Basin, which includes sediments that reflect modern Upper North Atlantic Deep Water and extends through the last deglaciation into the last glacial period when the site was bathed in Glacial North Atlantic Intermediate W...
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Online Access: | http://www.osti.gov/servlets/purl/1828663 https://www.osti.gov/biblio/1828663 https://doi.org/10.1029/2020pa004187 |
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ftosti:oai:osti.gov:1828663 2023-07-30T03:59:22+02:00 Can We Better Constrain the Timing of GNAIW/UNADW Variability in the Western Equatorial Atlantic and Its Relationship to Climate Change During the Last Deglaciation? Guilderson, Thomas P. Allen, Katherine Landers, Jordan P. Ettwein, Virginia J. Cook, Mea S. 2022-07-28 application/pdf http://www.osti.gov/servlets/purl/1828663 https://www.osti.gov/biblio/1828663 https://doi.org/10.1029/2020pa004187 unknown http://www.osti.gov/servlets/purl/1828663 https://www.osti.gov/biblio/1828663 https://doi.org/10.1029/2020pa004187 doi:10.1029/2020pa004187 58 GEOSCIENCES 2022 ftosti https://doi.org/10.1029/2020pa004187 2023-07-11T10:08:05Z We have revisited the well-trod VM28-122 core retrieved from the deep Colombian Basin, which includes sediments that reflect modern Upper North Atlantic Deep Water and extends through the last deglaciation into the last glacial period when the site was bathed in Glacial North Atlantic Intermediate Water. Here, we leverage the nearby Cariaco Basin's surface water radiocarbon reconstruction (reservoir age, and ΔR) on the IntCal20 timescale to recast the period of the last deglaciation with a newly constrained age model. Based on the revised age model, we observe that the multimillennial decrease in benthic δ 13 C and B/Ca (which record δ 13 C of dissolved inorganic carbon and Δ[CO 3 –2 ], respectively) began at 18,100 ± 240 (95% CI) calibrated years BP, synchronous with Termination 1, as identified by changes in the Antarctic Ice Sheet composite and by the onset of rapid glacier recession in the Southern Hemisphere (Denton et al., 2010, https://doi.org/10.1126/science.1184119; Denton et al., 2021, https://10.1016/j.quascirev.2020.106771). The beginning of the decrease in benthic δ 18 O is concurrent with the changes in carbon chemistry or at most, a few hundred years later. It is no later than 17,700 ± 300 (95% CI) yrs BP in our record, at the putative start of Heinrich Stadial 1. With sufficient data density (more than 2–3 control points per kyr) and an independent record of past surface water radiocarbon variations, it is possible to achieve late glacial and deglacial chronologies with fidelities similar to those of ice cores. Furthermore, doing so in more oceanographic locations should shed light more broadly on the mechanisms instrumental to abrupt climate change. Other/Unknown Material Antarc* Antarctic Ice Sheet North Atlantic Deep Water North Atlantic SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Antarctic The Antarctic Paleoceanography and Paleoclimatology 36 8 |
institution |
Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
58 GEOSCIENCES |
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58 GEOSCIENCES Guilderson, Thomas P. Allen, Katherine Landers, Jordan P. Ettwein, Virginia J. Cook, Mea S. Can We Better Constrain the Timing of GNAIW/UNADW Variability in the Western Equatorial Atlantic and Its Relationship to Climate Change During the Last Deglaciation? |
topic_facet |
58 GEOSCIENCES |
description |
We have revisited the well-trod VM28-122 core retrieved from the deep Colombian Basin, which includes sediments that reflect modern Upper North Atlantic Deep Water and extends through the last deglaciation into the last glacial period when the site was bathed in Glacial North Atlantic Intermediate Water. Here, we leverage the nearby Cariaco Basin's surface water radiocarbon reconstruction (reservoir age, and ΔR) on the IntCal20 timescale to recast the period of the last deglaciation with a newly constrained age model. Based on the revised age model, we observe that the multimillennial decrease in benthic δ 13 C and B/Ca (which record δ 13 C of dissolved inorganic carbon and Δ[CO 3 –2 ], respectively) began at 18,100 ± 240 (95% CI) calibrated years BP, synchronous with Termination 1, as identified by changes in the Antarctic Ice Sheet composite and by the onset of rapid glacier recession in the Southern Hemisphere (Denton et al., 2010, https://doi.org/10.1126/science.1184119; Denton et al., 2021, https://10.1016/j.quascirev.2020.106771). The beginning of the decrease in benthic δ 18 O is concurrent with the changes in carbon chemistry or at most, a few hundred years later. It is no later than 17,700 ± 300 (95% CI) yrs BP in our record, at the putative start of Heinrich Stadial 1. With sufficient data density (more than 2–3 control points per kyr) and an independent record of past surface water radiocarbon variations, it is possible to achieve late glacial and deglacial chronologies with fidelities similar to those of ice cores. Furthermore, doing so in more oceanographic locations should shed light more broadly on the mechanisms instrumental to abrupt climate change. |
author |
Guilderson, Thomas P. Allen, Katherine Landers, Jordan P. Ettwein, Virginia J. Cook, Mea S. |
author_facet |
Guilderson, Thomas P. Allen, Katherine Landers, Jordan P. Ettwein, Virginia J. Cook, Mea S. |
author_sort |
Guilderson, Thomas P. |
title |
Can We Better Constrain the Timing of GNAIW/UNADW Variability in the Western Equatorial Atlantic and Its Relationship to Climate Change During the Last Deglaciation? |
title_short |
Can We Better Constrain the Timing of GNAIW/UNADW Variability in the Western Equatorial Atlantic and Its Relationship to Climate Change During the Last Deglaciation? |
title_full |
Can We Better Constrain the Timing of GNAIW/UNADW Variability in the Western Equatorial Atlantic and Its Relationship to Climate Change During the Last Deglaciation? |
title_fullStr |
Can We Better Constrain the Timing of GNAIW/UNADW Variability in the Western Equatorial Atlantic and Its Relationship to Climate Change During the Last Deglaciation? |
title_full_unstemmed |
Can We Better Constrain the Timing of GNAIW/UNADW Variability in the Western Equatorial Atlantic and Its Relationship to Climate Change During the Last Deglaciation? |
title_sort |
can we better constrain the timing of gnaiw/unadw variability in the western equatorial atlantic and its relationship to climate change during the last deglaciation? |
publishDate |
2022 |
url |
http://www.osti.gov/servlets/purl/1828663 https://www.osti.gov/biblio/1828663 https://doi.org/10.1029/2020pa004187 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Ice Sheet North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic Ice Sheet North Atlantic Deep Water North Atlantic |
op_relation |
http://www.osti.gov/servlets/purl/1828663 https://www.osti.gov/biblio/1828663 https://doi.org/10.1029/2020pa004187 doi:10.1029/2020pa004187 |
op_doi |
https://doi.org/10.1029/2020pa004187 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
36 |
container_issue |
8 |
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1772810162184126464 |