Influence of brine formation on Arctic Ocean circulation over the past 15 million years
The early oceanographic history of the Arctic Ocean is important in regulating, and responding to, climatic changes. However, constraints on its oceanographic history preceding the Quaternary (the past 1.8 Myr) have become available only recently, because of the difficulties associated with obtainin...
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ftoceanrep:oai:oceanrep.geomar.de:6740 2023-05-15T14:26:00+02:00 Influence of brine formation on Arctic Ocean circulation over the past 15 million years Haley, Brian Frank, Martin Spielhagen, Robert Eisenhauer, Anton 2008 text https://oceanrep.geomar.de/id/eprint/6740/ https://oceanrep.geomar.de/id/eprint/6740/1/ngeo.2007.5.pdf http://www.nature.com/ngeo/journal/vaop/ncurrent/full/ngeo.2007.5.html https://doi.org/10.1038/ngeo.2007.5 en eng Nature Publishing Group https://oceanrep.geomar.de/id/eprint/6740/1/ngeo.2007.5.pdf Haley, B., Frank, M. , Spielhagen, R. and Eisenhauer, A. (2008) Influence of brine formation on Arctic Ocean circulation over the past 15 million years. Nature Geoscience, 1 . pp. 68-72. DOI 10.1038/ngeo.2007.5 <https://doi.org/10.1038/ngeo.2007.5>. doi:10.1038/ngeo.2007.5 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2008 ftoceanrep https://doi.org/10.1038/ngeo.2007.5 2023-04-07T14:53:24Z The early oceanographic history of the Arctic Ocean is important in regulating, and responding to, climatic changes. However, constraints on its oceanographic history preceding the Quaternary (the past 1.8 Myr) have become available only recently, because of the difficulties associated with obtaining continuous sediment records in such a hostile setting. Here, we use the neodymium isotope compositions of two sediment cores recovered near the North Pole to reconstruct over the past approx15 Myr the sources contributing to Arctic Intermediate Water, a water mass found today at depths of 200 to 1,500 m. We interpret high neodymium ratios for the period between 15 and 2 Myr ago, and for the glacial periods thereafter, as indicative of weathering input from the Siberian Putoranan basalts into the Arctic Ocean. Arctic Intermediate Water was then derived from brine formation in the Eurasian shelf regions, with only a limited contribution of intermediate water from the North Atlantic. In contrast, the modern circulation pattern, with relatively high contributions of North Atlantic Intermediate Water and negligible input from brine formation, exhibits low neodymium isotope ratios and is typical for the interglacial periods of the past 2 Myr. We suggest that changes in climatic conditions and the tectonic setting were responsible for switches between these two modes. Article in Journal/Newspaper Arctic Arctic Arctic Ocean North Atlantic North Pole OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Arctic Ocean North Pole Nature Geoscience 1 1 68 72 |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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English |
description |
The early oceanographic history of the Arctic Ocean is important in regulating, and responding to, climatic changes. However, constraints on its oceanographic history preceding the Quaternary (the past 1.8 Myr) have become available only recently, because of the difficulties associated with obtaining continuous sediment records in such a hostile setting. Here, we use the neodymium isotope compositions of two sediment cores recovered near the North Pole to reconstruct over the past approx15 Myr the sources contributing to Arctic Intermediate Water, a water mass found today at depths of 200 to 1,500 m. We interpret high neodymium ratios for the period between 15 and 2 Myr ago, and for the glacial periods thereafter, as indicative of weathering input from the Siberian Putoranan basalts into the Arctic Ocean. Arctic Intermediate Water was then derived from brine formation in the Eurasian shelf regions, with only a limited contribution of intermediate water from the North Atlantic. In contrast, the modern circulation pattern, with relatively high contributions of North Atlantic Intermediate Water and negligible input from brine formation, exhibits low neodymium isotope ratios and is typical for the interglacial periods of the past 2 Myr. We suggest that changes in climatic conditions and the tectonic setting were responsible for switches between these two modes. |
format |
Article in Journal/Newspaper |
author |
Haley, Brian Frank, Martin Spielhagen, Robert Eisenhauer, Anton |
spellingShingle |
Haley, Brian Frank, Martin Spielhagen, Robert Eisenhauer, Anton Influence of brine formation on Arctic Ocean circulation over the past 15 million years |
author_facet |
Haley, Brian Frank, Martin Spielhagen, Robert Eisenhauer, Anton |
author_sort |
Haley, Brian |
title |
Influence of brine formation on Arctic Ocean circulation over the past 15 million years |
title_short |
Influence of brine formation on Arctic Ocean circulation over the past 15 million years |
title_full |
Influence of brine formation on Arctic Ocean circulation over the past 15 million years |
title_fullStr |
Influence of brine formation on Arctic Ocean circulation over the past 15 million years |
title_full_unstemmed |
Influence of brine formation on Arctic Ocean circulation over the past 15 million years |
title_sort |
influence of brine formation on arctic ocean circulation over the past 15 million years |
publisher |
Nature Publishing Group |
publishDate |
2008 |
url |
https://oceanrep.geomar.de/id/eprint/6740/ https://oceanrep.geomar.de/id/eprint/6740/1/ngeo.2007.5.pdf http://www.nature.com/ngeo/journal/vaop/ncurrent/full/ngeo.2007.5.html https://doi.org/10.1038/ngeo.2007.5 |
geographic |
Arctic Arctic Ocean North Pole |
geographic_facet |
Arctic Arctic Ocean North Pole |
genre |
Arctic Arctic Arctic Ocean North Atlantic North Pole |
genre_facet |
Arctic Arctic Arctic Ocean North Atlantic North Pole |
op_relation |
https://oceanrep.geomar.de/id/eprint/6740/1/ngeo.2007.5.pdf Haley, B., Frank, M. , Spielhagen, R. and Eisenhauer, A. (2008) Influence of brine formation on Arctic Ocean circulation over the past 15 million years. Nature Geoscience, 1 . pp. 68-72. DOI 10.1038/ngeo.2007.5 <https://doi.org/10.1038/ngeo.2007.5>. doi:10.1038/ngeo.2007.5 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1038/ngeo.2007.5 |
container_title |
Nature Geoscience |
container_volume |
1 |
container_issue |
1 |
container_start_page |
68 |
op_container_end_page |
72 |
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1766298489091784704 |