Ocean circulation reconstructions from epsilon(Nd): A model-based feasibility study
Over the past decade, records of the seawater neodymium isotopic composition (epsilon(Nd)) have become a widely used proxy to reconstruct changes in ocean circulation. Our study investigates the transient response of epsilon(Nd) to large-scale ocean circulation changes using an Earth system model of...
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ftarchimer:oai:archimer.ifremer.fr:40055 2023-05-15T13:50:50+02:00 Ocean circulation reconstructions from epsilon(Nd): A model-based feasibility study Friedrich, T. Timmermann, A. Stichel, T. Pahnke, K. 2014-11-04 application/pdf https://archimer.ifremer.fr/doc/00289/40055/39405.pdf https://archimer.ifremer.fr/doc/00289/40055/39406.pdf https://doi.org/10.1002/2014PA002658 https://archimer.ifremer.fr/doc/00289/40055/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00289/40055/39405.pdf https://archimer.ifremer.fr/doc/00289/40055/39406.pdf doi:10.1002/2014PA002658 https://archimer.ifremer.fr/doc/00289/40055/ 2014. American Geophysical Union. All Rights Reserved. info:eu-repo/semantics/openAccess restricted use Paleoceanography (0883-8305) (Amer Geophysical Union), 2014-11-04 , Vol. 29 , N. 11 , P. 1003-1023 neodymium ocean circulation meridional overturning ocean modeling reconstruction text Publication info:eu-repo/semantics/article 2014 ftarchimer https://doi.org/10.1002/2014PA002658 2021-09-23T20:26:50Z Over the past decade, records of the seawater neodymium isotopic composition (epsilon(Nd)) have become a widely used proxy to reconstruct changes in ocean circulation. Our study investigates the transient response of epsilon(Nd) to large-scale ocean circulation changes using an Earth system model of intermediate complexity. It is shown that a weakening of the North Atlantic Deep Water formation results in positive epsilon(Nd) anomalies in the Atlantic and the Pacific below 1000m water depth whereas variations in Antarctic Bottom Water production generate a Pacific-Atlantic dipole pattern of deep ocean epsilon(Nd) changes. Further experiments explore which ocean regions are suitable to record the temporal evolution of the overturning in the North Atlantic and the Southern Ocean by means of epsilon(Nd) data. High local correlations occur between simulated Southern Ocean overturning changes and simulated epsilon(Nd) anomalies in the deep North Pacific and almost globally for simulated North Atlantic overturning changes, respectively, clearly indicating the strong potential of epsilon(Nd) to work as a proxy of past ocean circulation changes. Finally, the compromising effects of simultaneously occurring anomalies in the North Atlantic and the Southern Ocean overturning cells on reconstructions of past ocean circulation changes are identified. Combining our model simulations with currently available core data, our study demonstrates that changes in epsilon(Nd) documented in numerous Atlantic paleorecords clearly support the notion of a strengthening in the Atlantic Meridional Overturning Circulation over the course of Termination 1. Article in Journal/Newspaper Antarc* Antarctic North Atlantic Deep Water North Atlantic Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Southern Ocean Pacific Paleoceanography 29 11 1003 1023 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
neodymium ocean circulation meridional overturning ocean modeling reconstruction |
spellingShingle |
neodymium ocean circulation meridional overturning ocean modeling reconstruction Friedrich, T. Timmermann, A. Stichel, T. Pahnke, K. Ocean circulation reconstructions from epsilon(Nd): A model-based feasibility study |
topic_facet |
neodymium ocean circulation meridional overturning ocean modeling reconstruction |
description |
Over the past decade, records of the seawater neodymium isotopic composition (epsilon(Nd)) have become a widely used proxy to reconstruct changes in ocean circulation. Our study investigates the transient response of epsilon(Nd) to large-scale ocean circulation changes using an Earth system model of intermediate complexity. It is shown that a weakening of the North Atlantic Deep Water formation results in positive epsilon(Nd) anomalies in the Atlantic and the Pacific below 1000m water depth whereas variations in Antarctic Bottom Water production generate a Pacific-Atlantic dipole pattern of deep ocean epsilon(Nd) changes. Further experiments explore which ocean regions are suitable to record the temporal evolution of the overturning in the North Atlantic and the Southern Ocean by means of epsilon(Nd) data. High local correlations occur between simulated Southern Ocean overturning changes and simulated epsilon(Nd) anomalies in the deep North Pacific and almost globally for simulated North Atlantic overturning changes, respectively, clearly indicating the strong potential of epsilon(Nd) to work as a proxy of past ocean circulation changes. Finally, the compromising effects of simultaneously occurring anomalies in the North Atlantic and the Southern Ocean overturning cells on reconstructions of past ocean circulation changes are identified. Combining our model simulations with currently available core data, our study demonstrates that changes in epsilon(Nd) documented in numerous Atlantic paleorecords clearly support the notion of a strengthening in the Atlantic Meridional Overturning Circulation over the course of Termination 1. |
format |
Article in Journal/Newspaper |
author |
Friedrich, T. Timmermann, A. Stichel, T. Pahnke, K. |
author_facet |
Friedrich, T. Timmermann, A. Stichel, T. Pahnke, K. |
author_sort |
Friedrich, T. |
title |
Ocean circulation reconstructions from epsilon(Nd): A model-based feasibility study |
title_short |
Ocean circulation reconstructions from epsilon(Nd): A model-based feasibility study |
title_full |
Ocean circulation reconstructions from epsilon(Nd): A model-based feasibility study |
title_fullStr |
Ocean circulation reconstructions from epsilon(Nd): A model-based feasibility study |
title_full_unstemmed |
Ocean circulation reconstructions from epsilon(Nd): A model-based feasibility study |
title_sort |
ocean circulation reconstructions from epsilon(nd): a model-based feasibility study |
publisher |
Amer Geophysical Union |
publishDate |
2014 |
url |
https://archimer.ifremer.fr/doc/00289/40055/39405.pdf https://archimer.ifremer.fr/doc/00289/40055/39406.pdf https://doi.org/10.1002/2014PA002658 https://archimer.ifremer.fr/doc/00289/40055/ |
geographic |
Antarctic Southern Ocean Pacific |
geographic_facet |
Antarctic Southern Ocean Pacific |
genre |
Antarc* Antarctic North Atlantic Deep Water North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic North Atlantic Deep Water North Atlantic Southern Ocean |
op_source |
Paleoceanography (0883-8305) (Amer Geophysical Union), 2014-11-04 , Vol. 29 , N. 11 , P. 1003-1023 |
op_relation |
https://archimer.ifremer.fr/doc/00289/40055/39405.pdf https://archimer.ifremer.fr/doc/00289/40055/39406.pdf doi:10.1002/2014PA002658 https://archimer.ifremer.fr/doc/00289/40055/ |
op_rights |
2014. American Geophysical Union. All Rights Reserved. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1002/2014PA002658 |
container_title |
Paleoceanography |
container_volume |
29 |
container_issue |
11 |
container_start_page |
1003 |
op_container_end_page |
1023 |
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1766254143104614400 |