Termination 1 timing in radiocarbon-dated regional benthic δ18O stacks
©2014. American Geophysical Union. Benthic δ 18 O changes are often assumed to be globally synchronous, but studies comparing 2-9 radiocarbon-dated records over the most recent deglaciation (Termination 1) have proposed differences in the timing of benthic δ 18 O change between the Atlantic and Paci...
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ftcdlib:oai:escholarship.org:ark:/13030/qt9gg9r5f9 2023-05-15T17:31:18+02:00 Termination 1 timing in radiocarbon-dated regional benthic δ18O stacks Stern, JV Lisiecki, LE 2015-01-01 application/pdf https://escholarship.org/uc/item/9gg9r5f9 unknown eScholarship, University of California qt9gg9r5f9 https://escholarship.org/uc/item/9gg9r5f9 public Geochemistry Oceanography Ecology Paleontology article 2015 ftcdlib 2022-12-19T18:37:27Z ©2014. American Geophysical Union. Benthic δ 18 O changes are often assumed to be globally synchronous, but studies comparing 2-9 radiocarbon-dated records over the most recent deglaciation (Termination 1) have proposed differences in the timing of benthic δ 18 O change between the Atlantic and Pacific, intermediate and deep, and North and South Atlantic. Because of the relatively small number of records used in these previous studies, it has remained unclear whether these differences are local or regional in scale. Here we present seven regional benthic δ 18 O stacks for 0-40 kyr B.P. that include 252 records with independent regional age models constrained by 852 planktonic foraminiferal 14 C dates from 61 of these cores. We find a 4000 year difference between the earliest termination onset in the intermediate South Atlantic at 18.5 (95% confidence interval: 17.9-19.0) kyr B.P. and the latest in the deep Indian at 14.5 (14.1-15.0) kyr B.P. The termination onset occurs at 17.5 kyr B.P. in the intermediate and deep North Atlantic, deep South Atlantic, and deep Pacific. However, throughout the termination deep North Atlantic benthic δ 18 O leads the deep Pacific by an average of 1000year and a maximum of 1700year. Additionally, the intermediate Pacific termination onset at 16.5 (16.1-16.9) kyr B.P. demonstrates that intermediate-depth benthic δ 18 O change was not globally synchronous. These regional stacks provide better age models than a global stack across Termination 1 and potentially important constraints on deglacial ocean circulation changes. Article in Journal/Newspaper North Atlantic University of California: eScholarship Indian Pacific |
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University of California: eScholarship |
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topic |
Geochemistry Oceanography Ecology Paleontology |
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Geochemistry Oceanography Ecology Paleontology Stern, JV Lisiecki, LE Termination 1 timing in radiocarbon-dated regional benthic δ18O stacks |
topic_facet |
Geochemistry Oceanography Ecology Paleontology |
description |
©2014. American Geophysical Union. Benthic δ 18 O changes are often assumed to be globally synchronous, but studies comparing 2-9 radiocarbon-dated records over the most recent deglaciation (Termination 1) have proposed differences in the timing of benthic δ 18 O change between the Atlantic and Pacific, intermediate and deep, and North and South Atlantic. Because of the relatively small number of records used in these previous studies, it has remained unclear whether these differences are local or regional in scale. Here we present seven regional benthic δ 18 O stacks for 0-40 kyr B.P. that include 252 records with independent regional age models constrained by 852 planktonic foraminiferal 14 C dates from 61 of these cores. We find a 4000 year difference between the earliest termination onset in the intermediate South Atlantic at 18.5 (95% confidence interval: 17.9-19.0) kyr B.P. and the latest in the deep Indian at 14.5 (14.1-15.0) kyr B.P. The termination onset occurs at 17.5 kyr B.P. in the intermediate and deep North Atlantic, deep South Atlantic, and deep Pacific. However, throughout the termination deep North Atlantic benthic δ 18 O leads the deep Pacific by an average of 1000year and a maximum of 1700year. Additionally, the intermediate Pacific termination onset at 16.5 (16.1-16.9) kyr B.P. demonstrates that intermediate-depth benthic δ 18 O change was not globally synchronous. These regional stacks provide better age models than a global stack across Termination 1 and potentially important constraints on deglacial ocean circulation changes. |
format |
Article in Journal/Newspaper |
author |
Stern, JV Lisiecki, LE |
author_facet |
Stern, JV Lisiecki, LE |
author_sort |
Stern, JV |
title |
Termination 1 timing in radiocarbon-dated regional benthic δ18O stacks |
title_short |
Termination 1 timing in radiocarbon-dated regional benthic δ18O stacks |
title_full |
Termination 1 timing in radiocarbon-dated regional benthic δ18O stacks |
title_fullStr |
Termination 1 timing in radiocarbon-dated regional benthic δ18O stacks |
title_full_unstemmed |
Termination 1 timing in radiocarbon-dated regional benthic δ18O stacks |
title_sort |
termination 1 timing in radiocarbon-dated regional benthic δ18o stacks |
publisher |
eScholarship, University of California |
publishDate |
2015 |
url |
https://escholarship.org/uc/item/9gg9r5f9 |
geographic |
Indian Pacific |
geographic_facet |
Indian Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
qt9gg9r5f9 https://escholarship.org/uc/item/9gg9r5f9 |
op_rights |
public |
_version_ |
1766128796490006528 |