Little change in ice age water mass structure from Cape Basin benthic neodymium and carbon isotopes
© The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Hines, S. K. V., Bolge, L., Goldstein, S. L., Charles, C. D., Hall, I. R., & Hemming, S. R. Little change in ice age water mass structure from C...
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American Geophysical Union
2021
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Online Access: | https://hdl.handle.net/1912/27981 |
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/27981 2023-05-15T17:13:52+02:00 Little change in ice age water mass structure from Cape Basin benthic neodymium and carbon isotopes Hines, Sophia K. Bolge, Louise Goldstein, Steven L. Charles, Christopher D. Hall, Ian R. Hemming, Sidney R. 2021-10-25 https://hdl.handle.net/1912/27981 unknown American Geophysical Union https://doi.org/10.1029/2021PA004281 Hines, S. K. V., Bolge, L., Goldstein, S. L., Charles, C. D., Hall, I. R., & Hemming, S. R. (2021). Little change in ice age water mass structure from Cape Basin benthic neodymium and carbon isotopes. Paleoceanography and Paleoclimatology, 36(11), e2021PA004281. https://hdl.handle.net/1912/27981 doi:10.1029/2021PA004281 Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ CC-BY Hines, S. K. V., Bolge, L., Goldstein, S. L., Charles, C. D., Hall, I. R., & Hemming, S. R. (2021). Little change in ice age water mass structure from Cape Basin benthic neodymium and carbon isotopes. Paleoceanography and Paleoclimatology, 36(11), e2021PA004281. doi:10.1029/2021PA004281 Ocean circulation Neodymium isotopes Carbon isotopes Article 2021 ftwhoas https://doi.org/10.1029/2021PA004281 2022-05-28T23:04:26Z © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Hines, S. K. V., Bolge, L., Goldstein, S. L., Charles, C. D., Hall, I. R., & Hemming, S. R. Little change in ice age water mass structure from Cape Basin benthic neodymium and carbon isotopes. Paleoceanography and Paleoclimatology, 36(11), (2021): e2021PA004281, https://doi.org/10.1029/2021PA004281. A common conception of the deep ocean during ice age episodes is that the upper circulation cell in the Atlantic was shoaled at the Last Glacial Maximum compared to today, and that this configuration facilitated enhanced carbon storage in the deep ocean, contributing to glacial CO2 draw-down. Here, we test this notion in the far South Atlantic, investigating changes in glacial circulation structure using paired neodymium and benthic carbon isotope measurements from International Ocean Discovery Program Site U1479, at 2,615 m water depth in the Cape Basin. We infer changes in circulation structure across the last glacial cycle by aligning our site with other existing carbon and neodymium isotope records from the Cape Basin, examining vertical isotope gradients, while determining the relative timing of inferred circulation changes at different depths. We find that Site U1479 had the most negative neodymium isotopic composition across the last glacial cycle among the analyzed sites, indicating that this depth was most strongly influenced by North Atlantic Deep Water (NADW) in both interglacial and glacial intervals. This observation precludes a hypothesized dramatic shoaling of NADW above ∼2,000 m. Our evidence, however, indicates greater stratification between mid-depth and abyssal sites throughout the last glacial cycle, conditions that developed in Marine Isotope Stage 5. These conditions still may have contributed to glacial carbon storage in the deep ocean, despite little change in the mid-depth ocean structure. This work was supported by NSF grant ... Article in Journal/Newspaper NADW North Atlantic Deep Water North Atlantic Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Hines ENVELOPE(13.035,13.035,66.243,66.243) Paleoceanography and Paleoclimatology 36 11 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
unknown |
topic |
Ocean circulation Neodymium isotopes Carbon isotopes |
spellingShingle |
Ocean circulation Neodymium isotopes Carbon isotopes Hines, Sophia K. Bolge, Louise Goldstein, Steven L. Charles, Christopher D. Hall, Ian R. Hemming, Sidney R. Little change in ice age water mass structure from Cape Basin benthic neodymium and carbon isotopes |
topic_facet |
Ocean circulation Neodymium isotopes Carbon isotopes |
description |
© The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Hines, S. K. V., Bolge, L., Goldstein, S. L., Charles, C. D., Hall, I. R., & Hemming, S. R. Little change in ice age water mass structure from Cape Basin benthic neodymium and carbon isotopes. Paleoceanography and Paleoclimatology, 36(11), (2021): e2021PA004281, https://doi.org/10.1029/2021PA004281. A common conception of the deep ocean during ice age episodes is that the upper circulation cell in the Atlantic was shoaled at the Last Glacial Maximum compared to today, and that this configuration facilitated enhanced carbon storage in the deep ocean, contributing to glacial CO2 draw-down. Here, we test this notion in the far South Atlantic, investigating changes in glacial circulation structure using paired neodymium and benthic carbon isotope measurements from International Ocean Discovery Program Site U1479, at 2,615 m water depth in the Cape Basin. We infer changes in circulation structure across the last glacial cycle by aligning our site with other existing carbon and neodymium isotope records from the Cape Basin, examining vertical isotope gradients, while determining the relative timing of inferred circulation changes at different depths. We find that Site U1479 had the most negative neodymium isotopic composition across the last glacial cycle among the analyzed sites, indicating that this depth was most strongly influenced by North Atlantic Deep Water (NADW) in both interglacial and glacial intervals. This observation precludes a hypothesized dramatic shoaling of NADW above ∼2,000 m. Our evidence, however, indicates greater stratification between mid-depth and abyssal sites throughout the last glacial cycle, conditions that developed in Marine Isotope Stage 5. These conditions still may have contributed to glacial carbon storage in the deep ocean, despite little change in the mid-depth ocean structure. This work was supported by NSF grant ... |
format |
Article in Journal/Newspaper |
author |
Hines, Sophia K. Bolge, Louise Goldstein, Steven L. Charles, Christopher D. Hall, Ian R. Hemming, Sidney R. |
author_facet |
Hines, Sophia K. Bolge, Louise Goldstein, Steven L. Charles, Christopher D. Hall, Ian R. Hemming, Sidney R. |
author_sort |
Hines, Sophia K. |
title |
Little change in ice age water mass structure from Cape Basin benthic neodymium and carbon isotopes |
title_short |
Little change in ice age water mass structure from Cape Basin benthic neodymium and carbon isotopes |
title_full |
Little change in ice age water mass structure from Cape Basin benthic neodymium and carbon isotopes |
title_fullStr |
Little change in ice age water mass structure from Cape Basin benthic neodymium and carbon isotopes |
title_full_unstemmed |
Little change in ice age water mass structure from Cape Basin benthic neodymium and carbon isotopes |
title_sort |
little change in ice age water mass structure from cape basin benthic neodymium and carbon isotopes |
publisher |
American Geophysical Union |
publishDate |
2021 |
url |
https://hdl.handle.net/1912/27981 |
long_lat |
ENVELOPE(13.035,13.035,66.243,66.243) |
geographic |
Hines |
geographic_facet |
Hines |
genre |
NADW North Atlantic Deep Water North Atlantic |
genre_facet |
NADW North Atlantic Deep Water North Atlantic |
op_source |
Hines, S. K. V., Bolge, L., Goldstein, S. L., Charles, C. D., Hall, I. R., & Hemming, S. R. (2021). Little change in ice age water mass structure from Cape Basin benthic neodymium and carbon isotopes. Paleoceanography and Paleoclimatology, 36(11), e2021PA004281. doi:10.1029/2021PA004281 |
op_relation |
https://doi.org/10.1029/2021PA004281 Hines, S. K. V., Bolge, L., Goldstein, S. L., Charles, C. D., Hall, I. R., & Hemming, S. R. (2021). Little change in ice age water mass structure from Cape Basin benthic neodymium and carbon isotopes. Paleoceanography and Paleoclimatology, 36(11), e2021PA004281. https://hdl.handle.net/1912/27981 doi:10.1029/2021PA004281 |
op_rights |
Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2021PA004281 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
36 |
container_issue |
11 |
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1766071063698997248 |