Modeling the relationship between 231Pa/230Th distribution in North Atlantic sediment and Atlantic meridional overturning circulation
Down-core variations in North Atlantic 231Paxs/230Thxs have been interpreted as changes in the strength of the Atlantic meridional overturning circulation (AMOC). This modeling study confirms that hypothetical changes in the AMOC would indeed be recorded as changes in the distribution of sedimentary...
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American Geophysical Union
2007
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ftunivbern:oai:boris.unibe.ch:158211 2023-08-20T04:08:08+02:00 Modeling the relationship between 231Pa/230Th distribution in North Atlantic sediment and Atlantic meridional overturning circulation Siddall, Mark Stocker, Thomas F. Henderson, Gideon M. Joos, Fortunat Frank, Martin Edwards, Neil R. Ritz, Stefan P. Müller, Simon A. 2007 application/pdf https://boris.unibe.ch/158211/1/siddall07po.pdf https://boris.unibe.ch/158211/ eng eng American Geophysical Union https://boris.unibe.ch/158211/ info:eu-repo/semantics/openAccess Siddall, Mark; Stocker, Thomas F.; Henderson, Gideon M.; Joos, Fortunat; Frank, Martin; Edwards, Neil R.; Ritz, Stefan P.; Müller, Simon A. (2007). Modeling the relationship between 231Pa/230Th distribution in North Atlantic sediment and Atlantic meridional overturning circulation. Paleoceanography, 22(2) American Geophysical Union 10.1029/2006PA001358 <http://dx.doi.org/10.1029/2006PA001358> 530 Physics info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2007 ftunivbern https://doi.org/10.1029/2006PA001358 2023-07-31T22:07:57Z Down-core variations in North Atlantic 231Paxs/230Thxs have been interpreted as changes in the strength of the Atlantic meridional overturning circulation (AMOC). This modeling study confirms that hypothetical changes in the AMOC would indeed be recorded as changes in the distribution of sedimentary 231Paxs/230Thxs. At different sites in the North Atlantic the changes in sedimentary 231Pa/230Th that we simulate are diverse and do not reflect a simple tendency for 231Paxs/230Thxs to increase toward the production ratio (0.093) when the AMOC strength reduces but instead are moderated by the particle flux. In its collapsed or reduced state the AMOC does not remove 231Pa from the North Atlantic: Instead, 231Pa is scavenged to the North Atlantic sediment in areas of high particle flux. In this way the North Atlantic 231Paxs/230Thxs during AMOC shutdown follows the same pattern as 231Paxs/230Thxs in modern ocean basins with reduced rates of meridional overturning (i.e., Pacific or Indian oceans). We suggest that mapping the spatial distribution of 231Paxs/230Thxs across several key points in the North Atlantic is an achievable and practical qualitative indicator of the AMOC strength in the short term. Our results indicate that additional North Atlantic sites where down-core observations of 231Paxs/230Thxs would be useful coincide with locations which were maxima in the vertical particle flux during these periods. Reliable estimates of the North Atlantic mean 231Paxs/230Thxs should remain a goal in the longer term. Our results hint at a possible “seesaw-like” behavior in 231Pa/230Th in the South Atlantic.Down-core variations in North Atlantic 231Paxs/230Thxs have been interpreted as changes in the strength of the Atlantic meridional overturning circulation (AMOC). This modeling study confirms that hypothetical changes in the AMOC would indeed be recorded as changes in the distribution of sedimentary 231Paxs/230Thxs. At different sites in the North Atlantic the changes in sedimentary 231Pa/230Th that we simulate are ... Article in Journal/Newspaper North Atlantic BORIS (Bern Open Repository and Information System, University of Bern) Indian Pacific Paleoceanography 22 2 |
institution |
Open Polar |
collection |
BORIS (Bern Open Repository and Information System, University of Bern) |
op_collection_id |
ftunivbern |
language |
English |
topic |
530 Physics |
spellingShingle |
530 Physics Siddall, Mark Stocker, Thomas F. Henderson, Gideon M. Joos, Fortunat Frank, Martin Edwards, Neil R. Ritz, Stefan P. Müller, Simon A. Modeling the relationship between 231Pa/230Th distribution in North Atlantic sediment and Atlantic meridional overturning circulation |
topic_facet |
530 Physics |
description |
Down-core variations in North Atlantic 231Paxs/230Thxs have been interpreted as changes in the strength of the Atlantic meridional overturning circulation (AMOC). This modeling study confirms that hypothetical changes in the AMOC would indeed be recorded as changes in the distribution of sedimentary 231Paxs/230Thxs. At different sites in the North Atlantic the changes in sedimentary 231Pa/230Th that we simulate are diverse and do not reflect a simple tendency for 231Paxs/230Thxs to increase toward the production ratio (0.093) when the AMOC strength reduces but instead are moderated by the particle flux. In its collapsed or reduced state the AMOC does not remove 231Pa from the North Atlantic: Instead, 231Pa is scavenged to the North Atlantic sediment in areas of high particle flux. In this way the North Atlantic 231Paxs/230Thxs during AMOC shutdown follows the same pattern as 231Paxs/230Thxs in modern ocean basins with reduced rates of meridional overturning (i.e., Pacific or Indian oceans). We suggest that mapping the spatial distribution of 231Paxs/230Thxs across several key points in the North Atlantic is an achievable and practical qualitative indicator of the AMOC strength in the short term. Our results indicate that additional North Atlantic sites where down-core observations of 231Paxs/230Thxs would be useful coincide with locations which were maxima in the vertical particle flux during these periods. Reliable estimates of the North Atlantic mean 231Paxs/230Thxs should remain a goal in the longer term. Our results hint at a possible “seesaw-like” behavior in 231Pa/230Th in the South Atlantic.Down-core variations in North Atlantic 231Paxs/230Thxs have been interpreted as changes in the strength of the Atlantic meridional overturning circulation (AMOC). This modeling study confirms that hypothetical changes in the AMOC would indeed be recorded as changes in the distribution of sedimentary 231Paxs/230Thxs. At different sites in the North Atlantic the changes in sedimentary 231Pa/230Th that we simulate are ... |
format |
Article in Journal/Newspaper |
author |
Siddall, Mark Stocker, Thomas F. Henderson, Gideon M. Joos, Fortunat Frank, Martin Edwards, Neil R. Ritz, Stefan P. Müller, Simon A. |
author_facet |
Siddall, Mark Stocker, Thomas F. Henderson, Gideon M. Joos, Fortunat Frank, Martin Edwards, Neil R. Ritz, Stefan P. Müller, Simon A. |
author_sort |
Siddall, Mark |
title |
Modeling the relationship between 231Pa/230Th distribution in North Atlantic sediment and Atlantic meridional overturning circulation |
title_short |
Modeling the relationship between 231Pa/230Th distribution in North Atlantic sediment and Atlantic meridional overturning circulation |
title_full |
Modeling the relationship between 231Pa/230Th distribution in North Atlantic sediment and Atlantic meridional overturning circulation |
title_fullStr |
Modeling the relationship between 231Pa/230Th distribution in North Atlantic sediment and Atlantic meridional overturning circulation |
title_full_unstemmed |
Modeling the relationship between 231Pa/230Th distribution in North Atlantic sediment and Atlantic meridional overturning circulation |
title_sort |
modeling the relationship between 231pa/230th distribution in north atlantic sediment and atlantic meridional overturning circulation |
publisher |
American Geophysical Union |
publishDate |
2007 |
url |
https://boris.unibe.ch/158211/1/siddall07po.pdf https://boris.unibe.ch/158211/ |
geographic |
Indian Pacific |
geographic_facet |
Indian Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Siddall, Mark; Stocker, Thomas F.; Henderson, Gideon M.; Joos, Fortunat; Frank, Martin; Edwards, Neil R.; Ritz, Stefan P.; Müller, Simon A. (2007). Modeling the relationship between 231Pa/230Th distribution in North Atlantic sediment and Atlantic meridional overturning circulation. Paleoceanography, 22(2) American Geophysical Union 10.1029/2006PA001358 <http://dx.doi.org/10.1029/2006PA001358> |
op_relation |
https://boris.unibe.ch/158211/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2006PA001358 |
container_title |
Paleoceanography |
container_volume |
22 |
container_issue |
2 |
_version_ |
1774720237569048576 |