Influence of elevated Nd fluxes on the northern Nd isotope end member of the Atlantic during the early Holocene
The neodymium (Nd) isotopic composition of seawater is a valuable tool for the reconstruction of past water mass provenance and hence deep water geometry. A meaningful interpretation of Nd isotope down‐core records requires knowledge of potential variations of water mass end member characteristics....
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2020
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ftdatacite:10.48350/154794 2023-05-15T17:45:42+02:00 Influence of elevated Nd fluxes on the northern Nd isotope end member of the Atlantic during the early Holocene Pöppelmeier, Frerk Scheen, Jeemijn Blaser, Patrick Lippold, Jörg Gutjahr, Marcus Stocker, Thomas F. 2020 https://dx.doi.org/10.48350/154794 https://boris.unibe.ch/154794/ unknown American Geophysical Union open access Creative Commons Attribution Non Commercial 4.0 International https://creativecommons.org/licenses/by-nc/4.0/legalcode cc-by-nc-4.0 http://purl.org/coar/access_right/c_abf2 CC-BY-NC 530 Physics 550 Earth sciences & geology Text article-journal journal article ScholarlyArticle 2020 ftdatacite https://doi.org/10.48350/154794 2021-11-05T12:55:41Z The neodymium (Nd) isotopic composition of seawater is a valuable tool for the reconstruction of past water mass provenance and hence deep water geometry. A meaningful interpretation of Nd isotope down‐core records requires knowledge of potential variations of water mass end member characteristics. While often assumed temporally constant, recent investigations revealed glacial‐interglacial variability of the northern and southern Nd isotope end members in the Atlantic. These new constraints have a strong influence on the interpretation of the Atlantic deep water mass evolution, yet the processes responsible for the end member shifts remain uncertain. Here we combine a new compilation of Atlantic Nd isotope reconstructions of the early Holocene with the Nd‐enabled Bern3D model to quantify the recently proposed hypothesis of a northern Nd isotope end member shift during the early Holocene. We achieve the best model‐data fit with a strong increase of the Nd flux in the northern high latitudes by a factor of 3 to 4, which lowers the northern end member signature by about 1 ε‐unit. Our findings thus agree with the rationale that glacially weathered material entered the northern Northwest Atlantic after the ice sheets retreated late in the deglaciation and released substantial amounts of unradiogenic Nd as suggested previously. Further, we find that variations in the strength of the Atlantic Meridional Overturning Circulation (AMOC) cannot reproduce the observed Nd isotope excursions of the compiled data, ruling out an early Holocene AMOC “overshoot.” Text Northwest Atlantic DataCite Metadata Store (German National Library of Science and Technology) |
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530 Physics 550 Earth sciences & geology |
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530 Physics 550 Earth sciences & geology Pöppelmeier, Frerk Scheen, Jeemijn Blaser, Patrick Lippold, Jörg Gutjahr, Marcus Stocker, Thomas F. Influence of elevated Nd fluxes on the northern Nd isotope end member of the Atlantic during the early Holocene |
topic_facet |
530 Physics 550 Earth sciences & geology |
description |
The neodymium (Nd) isotopic composition of seawater is a valuable tool for the reconstruction of past water mass provenance and hence deep water geometry. A meaningful interpretation of Nd isotope down‐core records requires knowledge of potential variations of water mass end member characteristics. While often assumed temporally constant, recent investigations revealed glacial‐interglacial variability of the northern and southern Nd isotope end members in the Atlantic. These new constraints have a strong influence on the interpretation of the Atlantic deep water mass evolution, yet the processes responsible for the end member shifts remain uncertain. Here we combine a new compilation of Atlantic Nd isotope reconstructions of the early Holocene with the Nd‐enabled Bern3D model to quantify the recently proposed hypothesis of a northern Nd isotope end member shift during the early Holocene. We achieve the best model‐data fit with a strong increase of the Nd flux in the northern high latitudes by a factor of 3 to 4, which lowers the northern end member signature by about 1 ε‐unit. Our findings thus agree with the rationale that glacially weathered material entered the northern Northwest Atlantic after the ice sheets retreated late in the deglaciation and released substantial amounts of unradiogenic Nd as suggested previously. Further, we find that variations in the strength of the Atlantic Meridional Overturning Circulation (AMOC) cannot reproduce the observed Nd isotope excursions of the compiled data, ruling out an early Holocene AMOC “overshoot.” |
format |
Text |
author |
Pöppelmeier, Frerk Scheen, Jeemijn Blaser, Patrick Lippold, Jörg Gutjahr, Marcus Stocker, Thomas F. |
author_facet |
Pöppelmeier, Frerk Scheen, Jeemijn Blaser, Patrick Lippold, Jörg Gutjahr, Marcus Stocker, Thomas F. |
author_sort |
Pöppelmeier, Frerk |
title |
Influence of elevated Nd fluxes on the northern Nd isotope end member of the Atlantic during the early Holocene |
title_short |
Influence of elevated Nd fluxes on the northern Nd isotope end member of the Atlantic during the early Holocene |
title_full |
Influence of elevated Nd fluxes on the northern Nd isotope end member of the Atlantic during the early Holocene |
title_fullStr |
Influence of elevated Nd fluxes on the northern Nd isotope end member of the Atlantic during the early Holocene |
title_full_unstemmed |
Influence of elevated Nd fluxes on the northern Nd isotope end member of the Atlantic during the early Holocene |
title_sort |
influence of elevated nd fluxes on the northern nd isotope end member of the atlantic during the early holocene |
publisher |
American Geophysical Union |
publishDate |
2020 |
url |
https://dx.doi.org/10.48350/154794 https://boris.unibe.ch/154794/ |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_rights |
open access Creative Commons Attribution Non Commercial 4.0 International https://creativecommons.org/licenses/by-nc/4.0/legalcode cc-by-nc-4.0 http://purl.org/coar/access_right/c_abf2 |
op_rightsnorm |
CC-BY-NC |
op_doi |
https://doi.org/10.48350/154794 |
_version_ |
1766148917758525440 |