Neodymium evidence for increased Circumpolar Deep Water flow to the North Pacific during the middle Miocene climate transition
This is the final version. Available from Wiley via the DOI in this record. Low salinity surface water inhibits local deep water formation in the modern North Pacific. Instead, southern‐sourced Circumpolar Deep Water (CDW) fills the basin, which is the product of watermasses formed from cold sinking...
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Online Access: | http://hdl.handle.net/10871/33280 https://doi.org/10.1029/2017PA003309 |
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ftunivexeter:oai:ore.exeter.ac.uk:10871/33280 2024-09-15T17:45:43+00:00 Neodymium evidence for increased Circumpolar Deep Water flow to the North Pacific during the middle Miocene climate transition Kender, S Bogus, KA Cobb, TD Thomas, DJ 2018 http://hdl.handle.net/10871/33280 https://doi.org/10.1029/2017PA003309 en eng American Geophysical Union The data supporting this publication can be obtained from the tables. The bulk of the shipboard-collected data from this expedition is accessible from the International Ocean Discovery Program (IODP) JOIDES Resolution Science Operator, Texas A&M University (TAMU), at iodp.tamu.edu/database/index.html. Available online 11 June 2018 doi:10.1029/2017PA003309 http://hdl.handle.net/10871/33280 2572-4517 Paleoceanography and Paleoclimatology ©2018. The Authors.This is an open access article under the terms of the Creative Commons Attribution License, which permits use,distribution and reproduction in any medium, provided the original work is properly cited Neodymium isotopes Fish teeth Philippine Sea Pacific meridional overturning circulation Neogene Circumpolar Deep Water Article 2018 ftunivexeter https://doi.org/10.1029/2017PA003309 2024-07-29T03:24:16Z This is the final version. Available from Wiley via the DOI in this record. Low salinity surface water inhibits local deep water formation in the modern North Pacific. Instead, southern‐sourced Circumpolar Deep Water (CDW) fills the basin, which is the product of watermasses formed from cold sinking centers in the Southern Ocean and North Atlantic. This CDW is responsible for transporting a significant amount of global heat and dissolved carbon in the deep Pacific Ocean. The history of its flow and the broader overturning circulation are widely assumed to be sensitive to climate perturbations. However, insufficient records exist of CDW presence in the deep North Pacific with which to evaluate its evolution and role in major climate transitions of the past 23 Ma. Here, we report sedimentary coatings and fish teeth neodymium isotope values – tracers for water‐mass mixing – from deep‐water International Ocean Discovery Program (IODP) Site U1438 (4.7 km water depth) in the Philippine Sea, northwest Pacific Ocean. Our results indicate the water mass shifted from a North Pacific source in the Early Miocene to a southern source by ~14 Ma. Within the age model and temporal constraints, this major reorganization of North Pacific water mass structure may have coincided with ice sheet build up on Antarctica, and is most consistent with an increased northward flux of CDW due to enhanced sinking of cold water forced by Antarctic cooling. The northward extent of this flux may have remained relatively constant during much of the past 14 Ma. This work was funded by Natural Environment Research Council (NERC) grant RGS 114419 to S.K Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet North Atlantic Southern Ocean University of Exeter: Open Research Exeter (ORE) Paleoceanography and Paleoclimatology 33 7 672 682 |
institution |
Open Polar |
collection |
University of Exeter: Open Research Exeter (ORE) |
op_collection_id |
ftunivexeter |
language |
English |
topic |
Neodymium isotopes Fish teeth Philippine Sea Pacific meridional overturning circulation Neogene Circumpolar Deep Water |
spellingShingle |
Neodymium isotopes Fish teeth Philippine Sea Pacific meridional overturning circulation Neogene Circumpolar Deep Water Kender, S Bogus, KA Cobb, TD Thomas, DJ Neodymium evidence for increased Circumpolar Deep Water flow to the North Pacific during the middle Miocene climate transition |
topic_facet |
Neodymium isotopes Fish teeth Philippine Sea Pacific meridional overturning circulation Neogene Circumpolar Deep Water |
description |
This is the final version. Available from Wiley via the DOI in this record. Low salinity surface water inhibits local deep water formation in the modern North Pacific. Instead, southern‐sourced Circumpolar Deep Water (CDW) fills the basin, which is the product of watermasses formed from cold sinking centers in the Southern Ocean and North Atlantic. This CDW is responsible for transporting a significant amount of global heat and dissolved carbon in the deep Pacific Ocean. The history of its flow and the broader overturning circulation are widely assumed to be sensitive to climate perturbations. However, insufficient records exist of CDW presence in the deep North Pacific with which to evaluate its evolution and role in major climate transitions of the past 23 Ma. Here, we report sedimentary coatings and fish teeth neodymium isotope values – tracers for water‐mass mixing – from deep‐water International Ocean Discovery Program (IODP) Site U1438 (4.7 km water depth) in the Philippine Sea, northwest Pacific Ocean. Our results indicate the water mass shifted from a North Pacific source in the Early Miocene to a southern source by ~14 Ma. Within the age model and temporal constraints, this major reorganization of North Pacific water mass structure may have coincided with ice sheet build up on Antarctica, and is most consistent with an increased northward flux of CDW due to enhanced sinking of cold water forced by Antarctic cooling. The northward extent of this flux may have remained relatively constant during much of the past 14 Ma. This work was funded by Natural Environment Research Council (NERC) grant RGS 114419 to S.K |
format |
Article in Journal/Newspaper |
author |
Kender, S Bogus, KA Cobb, TD Thomas, DJ |
author_facet |
Kender, S Bogus, KA Cobb, TD Thomas, DJ |
author_sort |
Kender, S |
title |
Neodymium evidence for increased Circumpolar Deep Water flow to the North Pacific during the middle Miocene climate transition |
title_short |
Neodymium evidence for increased Circumpolar Deep Water flow to the North Pacific during the middle Miocene climate transition |
title_full |
Neodymium evidence for increased Circumpolar Deep Water flow to the North Pacific during the middle Miocene climate transition |
title_fullStr |
Neodymium evidence for increased Circumpolar Deep Water flow to the North Pacific during the middle Miocene climate transition |
title_full_unstemmed |
Neodymium evidence for increased Circumpolar Deep Water flow to the North Pacific during the middle Miocene climate transition |
title_sort |
neodymium evidence for increased circumpolar deep water flow to the north pacific during the middle miocene climate transition |
publisher |
American Geophysical Union |
publishDate |
2018 |
url |
http://hdl.handle.net/10871/33280 https://doi.org/10.1029/2017PA003309 |
genre |
Antarc* Antarctic Antarctica Ice Sheet North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet North Atlantic Southern Ocean |
op_relation |
The data supporting this publication can be obtained from the tables. The bulk of the shipboard-collected data from this expedition is accessible from the International Ocean Discovery Program (IODP) JOIDES Resolution Science Operator, Texas A&M University (TAMU), at iodp.tamu.edu/database/index.html. Available online 11 June 2018 doi:10.1029/2017PA003309 http://hdl.handle.net/10871/33280 2572-4517 Paleoceanography and Paleoclimatology |
op_rights |
©2018. The Authors.This is an open access article under the terms of the Creative Commons Attribution License, which permits use,distribution and reproduction in any medium, provided the original work is properly cited |
op_doi |
https://doi.org/10.1029/2017PA003309 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
33 |
container_issue |
7 |
container_start_page |
672 |
op_container_end_page |
682 |
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1810493624067031040 |