Diachronous benthic δ18O responses during late Pleistocene terminations
Benthic δ 18O is often used as a stratigraphic tool to place marine records on a common age model and as a proxy for the timing of ice volume/sea level change. However, Skinner and Shackleton (2005) found that the timing of benthic δ 18O change at the last termination differed by 3900 years between...
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ftcdlib:oai:escholarship.org/ark:/13030/qt75p4t37d 2023-05-15T17:35:39+02:00 Diachronous benthic δ18O responses during late Pleistocene terminations Lisiecki, LE Raymo, ME 2009-09-01 application/pdf https://escholarship.org/uc/item/75p4t37d unknown eScholarship, University of California qt75p4t37d https://escholarship.org/uc/item/75p4t37d public Paleoceanography, vol 24, iss 3 Paleontology Geochemistry Oceanography Ecology article 2009 ftcdlib 2021-06-21T17:05:28Z Benthic δ 18O is often used as a stratigraphic tool to place marine records on a common age model and as a proxy for the timing of ice volume/sea level change. However, Skinner and Shackleton (2005) found that the timing of benthic δ 18O change at the last termination differed by 3900 years between one Atlantic site and one Pacific site. These results suggest that benthic δ 18O change may not always accurately record the timing of deglaciation. We compare benthic δ 18O records from 20 Atlantic sites and 14 Pacific sites to evaluate systematic differences in the timing of terminations in benthic δ 18O. Analysis of sedimentation rates derived from the alignment of benthic δ 18O suggests a statistically significant Atlantic lead over Pacific benthic δ 18O change during the last six terminations. We estimate an average Pacific benthic δ 18O lag of 1600 years for Terminations 1-5, slightly larger than the delay expected from ocean mixing rates given that most glacial meltwater probably enters the North Atlantic. We additionally find evidence of ∼4000-year Pacific δ 18O lags at approximately 128 ka and 330 ka, suggesting that stratigraphic correlation of δ 18O has the potential to generate age model errors of several thousand years during terminations. A simple model demonstrates that these lags can be generated by diachronous temperature changes and do not require slower circulation rates. Most importantly, diachronous benthic δ 18O responses must be taken into account when comparing Atlantic and Pacific benthic δ 18O records or when using benthic δ 18O records as a proxy for the timing of ice volume change. Copyright 2009 by the American Geophysical Union. Article in Journal/Newspaper North Atlantic University of California: eScholarship Pacific Shackleton |
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University of California: eScholarship |
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topic |
Paleontology Geochemistry Oceanography Ecology |
spellingShingle |
Paleontology Geochemistry Oceanography Ecology Lisiecki, LE Raymo, ME Diachronous benthic δ18O responses during late Pleistocene terminations |
topic_facet |
Paleontology Geochemistry Oceanography Ecology |
description |
Benthic δ 18O is often used as a stratigraphic tool to place marine records on a common age model and as a proxy for the timing of ice volume/sea level change. However, Skinner and Shackleton (2005) found that the timing of benthic δ 18O change at the last termination differed by 3900 years between one Atlantic site and one Pacific site. These results suggest that benthic δ 18O change may not always accurately record the timing of deglaciation. We compare benthic δ 18O records from 20 Atlantic sites and 14 Pacific sites to evaluate systematic differences in the timing of terminations in benthic δ 18O. Analysis of sedimentation rates derived from the alignment of benthic δ 18O suggests a statistically significant Atlantic lead over Pacific benthic δ 18O change during the last six terminations. We estimate an average Pacific benthic δ 18O lag of 1600 years for Terminations 1-5, slightly larger than the delay expected from ocean mixing rates given that most glacial meltwater probably enters the North Atlantic. We additionally find evidence of ∼4000-year Pacific δ 18O lags at approximately 128 ka and 330 ka, suggesting that stratigraphic correlation of δ 18O has the potential to generate age model errors of several thousand years during terminations. A simple model demonstrates that these lags can be generated by diachronous temperature changes and do not require slower circulation rates. Most importantly, diachronous benthic δ 18O responses must be taken into account when comparing Atlantic and Pacific benthic δ 18O records or when using benthic δ 18O records as a proxy for the timing of ice volume change. Copyright 2009 by the American Geophysical Union. |
format |
Article in Journal/Newspaper |
author |
Lisiecki, LE Raymo, ME |
author_facet |
Lisiecki, LE Raymo, ME |
author_sort |
Lisiecki, LE |
title |
Diachronous benthic δ18O responses during late Pleistocene terminations |
title_short |
Diachronous benthic δ18O responses during late Pleistocene terminations |
title_full |
Diachronous benthic δ18O responses during late Pleistocene terminations |
title_fullStr |
Diachronous benthic δ18O responses during late Pleistocene terminations |
title_full_unstemmed |
Diachronous benthic δ18O responses during late Pleistocene terminations |
title_sort |
diachronous benthic δ18o responses during late pleistocene terminations |
publisher |
eScholarship, University of California |
publishDate |
2009 |
url |
https://escholarship.org/uc/item/75p4t37d |
geographic |
Pacific Shackleton |
geographic_facet |
Pacific Shackleton |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Paleoceanography, vol 24, iss 3 |
op_relation |
qt75p4t37d https://escholarship.org/uc/item/75p4t37d |
op_rights |
public |
_version_ |
1766134885792088064 |