Inverse response of 231Pa/230Th to variations of the Atlantic meridional overturning circulation in the North Atlantic intermediate water
This study aims to provide a more detailed understanding of the behavior of ²³¹Pa/²³⁰Th under varying ocean circulation regimes. The North Atlantic provides a unique sedimentary setting with its ice-rafted detritus (IRD) layers deposited during glacial times. These layers have been found north of 40...
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ftdatacite:10.7892/boris.141787 2023-05-15T17:28:35+02:00 Inverse response of 231Pa/230Th to variations of the Atlantic meridional overturning circulation in the North Atlantic intermediate water Süfke, Finn Schulz, Hartmut Scheen, Jeemijn Szidat, Sönke Regelous, Marcel Blaser, Patrick Pöppelmeier, Frerk Goepfert, Tyler J. Stocker, Thomas F. Lippold, Jörg application/pdf https://dx.doi.org/10.7892/boris.141787 https://boris.unibe.ch/141787/ en eng Springer info:eu-repo/semantics/embargoedAccess info:eu-repo/semantics/restrictedAccess 530 Physics 540 Chemistry 550 Earth sciences & geology Text article-journal ScholarlyArticle ftdatacite https://doi.org/10.7892/boris.141787 2021-11-05T12:55:41Z This study aims to provide a more detailed understanding of the behavior of ²³¹Pa/²³⁰Th under varying ocean circulation regimes. The North Atlantic provides a unique sedimentary setting with its ice-rafted detritus (IRD) layers deposited during glacial times. These layers have been found north of 40° N (Ruddiman Belt) and are most pronounced during Heinrich Stadials. Most of these sediments have been recovered from the deep North Atlantic basin typically below 3000 m water depth. This study reports sedimentological and sediment geochemical data from one of the few sites at intermediate depth of the open North Atlantic (core SU90-I02, 45° N 39° W, 1965 m water depth) within the Ruddiman Belt. The time periods of Heinrich Stadials 1 and 2 of this core were identified with the help of the major element composition by XRF scanning and by IRD counting. Along the core profile, the sedimentary ²³¹Pa/²³⁰Th activity ratio has been measured as a kinematic proxy for the circulation strength. The ²³¹Pa/²³⁰Th record shows highest values during the Holocene and Last Glacial Maximum, above the natural production ratio of these isotopes. During Heinrich Stadials 1 and 2, when Atlantic meridional overturning circulation was most reduced, the ²³¹Pa/²³⁰Th record shows overall lowest values below the production ratio. This behavior is contrary to classical findings of ²³¹Pa/²³⁰Th from the northwestern Atlantic where a strong Holocene circulation is associated with low values. However, this behavior at the presented location is in agreement with results from simulations of the ²³¹Pa/²³⁰Th-enabled Bern3D Earth system model. Text North Atlantic DataCite Metadata Store (German National Library of Science and Technology) |
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Open Polar |
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DataCite Metadata Store (German National Library of Science and Technology) |
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ftdatacite |
language |
English |
topic |
530 Physics 540 Chemistry 550 Earth sciences & geology |
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530 Physics 540 Chemistry 550 Earth sciences & geology Süfke, Finn Schulz, Hartmut Scheen, Jeemijn Szidat, Sönke Regelous, Marcel Blaser, Patrick Pöppelmeier, Frerk Goepfert, Tyler J. Stocker, Thomas F. Lippold, Jörg Inverse response of 231Pa/230Th to variations of the Atlantic meridional overturning circulation in the North Atlantic intermediate water |
topic_facet |
530 Physics 540 Chemistry 550 Earth sciences & geology |
description |
This study aims to provide a more detailed understanding of the behavior of ²³¹Pa/²³⁰Th under varying ocean circulation regimes. The North Atlantic provides a unique sedimentary setting with its ice-rafted detritus (IRD) layers deposited during glacial times. These layers have been found north of 40° N (Ruddiman Belt) and are most pronounced during Heinrich Stadials. Most of these sediments have been recovered from the deep North Atlantic basin typically below 3000 m water depth. This study reports sedimentological and sediment geochemical data from one of the few sites at intermediate depth of the open North Atlantic (core SU90-I02, 45° N 39° W, 1965 m water depth) within the Ruddiman Belt. The time periods of Heinrich Stadials 1 and 2 of this core were identified with the help of the major element composition by XRF scanning and by IRD counting. Along the core profile, the sedimentary ²³¹Pa/²³⁰Th activity ratio has been measured as a kinematic proxy for the circulation strength. The ²³¹Pa/²³⁰Th record shows highest values during the Holocene and Last Glacial Maximum, above the natural production ratio of these isotopes. During Heinrich Stadials 1 and 2, when Atlantic meridional overturning circulation was most reduced, the ²³¹Pa/²³⁰Th record shows overall lowest values below the production ratio. This behavior is contrary to classical findings of ²³¹Pa/²³⁰Th from the northwestern Atlantic where a strong Holocene circulation is associated with low values. However, this behavior at the presented location is in agreement with results from simulations of the ²³¹Pa/²³⁰Th-enabled Bern3D Earth system model. |
format |
Text |
author |
Süfke, Finn Schulz, Hartmut Scheen, Jeemijn Szidat, Sönke Regelous, Marcel Blaser, Patrick Pöppelmeier, Frerk Goepfert, Tyler J. Stocker, Thomas F. Lippold, Jörg |
author_facet |
Süfke, Finn Schulz, Hartmut Scheen, Jeemijn Szidat, Sönke Regelous, Marcel Blaser, Patrick Pöppelmeier, Frerk Goepfert, Tyler J. Stocker, Thomas F. Lippold, Jörg |
author_sort |
Süfke, Finn |
title |
Inverse response of 231Pa/230Th to variations of the Atlantic meridional overturning circulation in the North Atlantic intermediate water |
title_short |
Inverse response of 231Pa/230Th to variations of the Atlantic meridional overturning circulation in the North Atlantic intermediate water |
title_full |
Inverse response of 231Pa/230Th to variations of the Atlantic meridional overturning circulation in the North Atlantic intermediate water |
title_fullStr |
Inverse response of 231Pa/230Th to variations of the Atlantic meridional overturning circulation in the North Atlantic intermediate water |
title_full_unstemmed |
Inverse response of 231Pa/230Th to variations of the Atlantic meridional overturning circulation in the North Atlantic intermediate water |
title_sort |
inverse response of 231pa/230th to variations of the atlantic meridional overturning circulation in the north atlantic intermediate water |
publisher |
Springer |
url |
https://dx.doi.org/10.7892/boris.141787 https://boris.unibe.ch/141787/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_rights |
info:eu-repo/semantics/embargoedAccess info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.7892/boris.141787 |
_version_ |
1766121334390128640 |