A deep-sea coral record of North Atlantic radiocarbon through the Younger Dryas: Evidence for intermediate water/deepwater reorganization
Our record of Younger Dryas intermediate-depth seawater Δ^(14)C from North Atlantic deep-sea corals supports a link between abrupt climate change and intermediate ocean variability. Our data show that northern source intermediate water (∼1700 m) was partially replaced by (14)^C-depleted southern...
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ftcaltechauth:oai:authors.library.caltech.edu:s366b-eer83 2024-06-23T07:54:51+00:00 A deep-sea coral record of North Atlantic radiocarbon through the Younger Dryas: Evidence for intermediate water/deepwater reorganization Eltgroth, Selene F. Adkins, Jess F. Robinson, Laura F. Southon, John Kashgarian, Michaele 2006-11-17 https://doi.org/10.1029/2005PA001192 unknown American Geophysical Union https://doi.org/10.1029/2005PA001192 oai:authors.library.caltech.edu:s366b-eer83 eprintid:33615 resolverid:CaltechAUTHORS:20120828-123314699 info:eu-repo/semantics/openAccess Other Paleoceanography, 21(4), Art. No. PA4207, (2006-11-17) info:eu-repo/semantics/article 2006 ftcaltechauth https://doi.org/10.1029/2005PA001192 2024-06-12T06:28:21Z Our record of Younger Dryas intermediate-depth seawater Δ^(14)C from North Atlantic deep-sea corals supports a link between abrupt climate change and intermediate ocean variability. Our data show that northern source intermediate water (∼1700 m) was partially replaced by (14)^C-depleted southern source water at the onset of the event, consistent with a reduction in the rate of North Atlantic Deep Water formation. This transition requires the existence of large, mobile gradients of Δ^(14)C in the ocean during the Younger Dryas. The Δ^(14)C water column profile from Keigwin (2004) provides direct evidence for the presence of one such gradient at the beginning of the Younger Dryas (∼12.9 ka), with a 100‰ offset between shallow (<∼2400 m) and deep water. Our early Younger Dryas data are consistent with this profile and also show a Δ^(14)C inversion, with 35‰ more enriched water at ∼2400 m than at ∼1700 m. This feature is probably the result of mixing between relatively well ^(14)C ventilated northern source water and more poorly ^(14)C ventilated southern source intermediate water, which is slightly shallower. Over the rest of the Younger Dryas our intermediate water/deepwater coral Δ^(14)C data gradually increase, while the atmosphere Δ^(14)C drops. For a very brief interval at ∼12.0 ka and at the end of the Younger Dryas (11.5 ka), intermediate water Δ^(14)C (∼1200 m) approached atmospheric Δ14C. These enriched Δ^(14)C results suggest an enhanced initial Δ^(14)C content of the water and demonstrate the presence of large lateral Δ^(14)C gradients in the intermediate/deep ocean in addition to the sharp vertical shift at ∼2500 m. The transient Δ^(14)C enrichment at ∼12.0 ka occurred in the middle of the Younger Dryas and demonstrates that there is at least one time when the intermediate/deep ocean underwent dramatic change but with much smaller effects in other paleoclimatic records. © 2006 American Geophysical Union. Received 12 July 2005; revised 25 May 2006; accepted 28 June ... Article in Journal/Newspaper North Atlantic Deep Water North Atlantic Caltech Authors (California Institute of Technology) Paleoceanography 21 4 |
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Caltech Authors (California Institute of Technology) |
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Our record of Younger Dryas intermediate-depth seawater Δ^(14)C from North Atlantic deep-sea corals supports a link between abrupt climate change and intermediate ocean variability. Our data show that northern source intermediate water (∼1700 m) was partially replaced by (14)^C-depleted southern source water at the onset of the event, consistent with a reduction in the rate of North Atlantic Deep Water formation. This transition requires the existence of large, mobile gradients of Δ^(14)C in the ocean during the Younger Dryas. The Δ^(14)C water column profile from Keigwin (2004) provides direct evidence for the presence of one such gradient at the beginning of the Younger Dryas (∼12.9 ka), with a 100‰ offset between shallow (<∼2400 m) and deep water. Our early Younger Dryas data are consistent with this profile and also show a Δ^(14)C inversion, with 35‰ more enriched water at ∼2400 m than at ∼1700 m. This feature is probably the result of mixing between relatively well ^(14)C ventilated northern source water and more poorly ^(14)C ventilated southern source intermediate water, which is slightly shallower. Over the rest of the Younger Dryas our intermediate water/deepwater coral Δ^(14)C data gradually increase, while the atmosphere Δ^(14)C drops. For a very brief interval at ∼12.0 ka and at the end of the Younger Dryas (11.5 ka), intermediate water Δ^(14)C (∼1200 m) approached atmospheric Δ14C. These enriched Δ^(14)C results suggest an enhanced initial Δ^(14)C content of the water and demonstrate the presence of large lateral Δ^(14)C gradients in the intermediate/deep ocean in addition to the sharp vertical shift at ∼2500 m. The transient Δ^(14)C enrichment at ∼12.0 ka occurred in the middle of the Younger Dryas and demonstrates that there is at least one time when the intermediate/deep ocean underwent dramatic change but with much smaller effects in other paleoclimatic records. © 2006 American Geophysical Union. Received 12 July 2005; revised 25 May 2006; accepted 28 June ... |
format |
Article in Journal/Newspaper |
author |
Eltgroth, Selene F. Adkins, Jess F. Robinson, Laura F. Southon, John Kashgarian, Michaele |
spellingShingle |
Eltgroth, Selene F. Adkins, Jess F. Robinson, Laura F. Southon, John Kashgarian, Michaele A deep-sea coral record of North Atlantic radiocarbon through the Younger Dryas: Evidence for intermediate water/deepwater reorganization |
author_facet |
Eltgroth, Selene F. Adkins, Jess F. Robinson, Laura F. Southon, John Kashgarian, Michaele |
author_sort |
Eltgroth, Selene F. |
title |
A deep-sea coral record of North Atlantic radiocarbon through the Younger Dryas: Evidence for intermediate water/deepwater reorganization |
title_short |
A deep-sea coral record of North Atlantic radiocarbon through the Younger Dryas: Evidence for intermediate water/deepwater reorganization |
title_full |
A deep-sea coral record of North Atlantic radiocarbon through the Younger Dryas: Evidence for intermediate water/deepwater reorganization |
title_fullStr |
A deep-sea coral record of North Atlantic radiocarbon through the Younger Dryas: Evidence for intermediate water/deepwater reorganization |
title_full_unstemmed |
A deep-sea coral record of North Atlantic radiocarbon through the Younger Dryas: Evidence for intermediate water/deepwater reorganization |
title_sort |
deep-sea coral record of north atlantic radiocarbon through the younger dryas: evidence for intermediate water/deepwater reorganization |
publisher |
American Geophysical Union |
publishDate |
2006 |
url |
https://doi.org/10.1029/2005PA001192 |
genre |
North Atlantic Deep Water North Atlantic |
genre_facet |
North Atlantic Deep Water North Atlantic |
op_source |
Paleoceanography, 21(4), Art. No. PA4207, (2006-11-17) |
op_relation |
https://doi.org/10.1029/2005PA001192 oai:authors.library.caltech.edu:s366b-eer83 eprintid:33615 resolverid:CaltechAUTHORS:20120828-123314699 |
op_rights |
info:eu-repo/semantics/openAccess Other |
op_doi |
https://doi.org/10.1029/2005PA001192 |
container_title |
Paleoceanography |
container_volume |
21 |
container_issue |
4 |
_version_ |
1802647153998299136 |