Foraminiferal, leachate and detrial neodymium isotopes from the South Atlantic
Antarctic Intermediate Water is an essential limb of the Atlantic meridional overturning circulation that redistributes heat and nutrients within the Atlantic Ocean. Existing reconstructions have yielded conflicting results on the history of Antarctic Intermediate Water penetration into the Atlantic...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.874868 2023-05-15T13:44:47+02:00 Foraminiferal, leachate and detrial neodymium isotopes from the South Atlantic Howe, Jacob N W Piotrowski, Alexander M Oppo, Delia W Huang, Kuo-Fang Mulitza, Stefan Chiessi, Cristiano Mazur Blusztajn, Jurek MEDIAN LATITUDE: -27.238112 * MEDIAN LONGITUDE: -46.431777 * SOUTH-BOUND LATITUDE: -27.285000 * WEST-BOUND LONGITUDE: -46.470330 * NORTH-BOUND LATITUDE: -27.176667 * EAST-BOUND LONGITUDE: -46.373333 * DATE/TIME START: 1993-03-03T00:00:00 * DATE/TIME END: 1998-10-14T00:00:00 2016-04-27 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.874868 https://doi.org/10.1594/PANGAEA.874868 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.874868 https://doi.org/10.1594/PANGAEA.874868 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Howe, Jacob N W; Piotrowski, Alexander M; Oppo, Delia W; Huang, Kuo-Fang; Mulitza, Stefan; Chiessi, Cristiano Mazur; Blusztajn, Jurek (2016): Antarctic intermediate water circulation in the South Atlantic over the past 25,000 years. Paleoceanography, 31(10), 1302-1314, https://doi.org/10.1002/2016PA002975 Center for Marine Environmental Sciences MARUM Dataset 2016 ftpangaea https://doi.org/10.1594/PANGAEA.874868 https://doi.org/10.1002/2016PA002975 2023-01-20T07:33:56Z Antarctic Intermediate Water is an essential limb of the Atlantic meridional overturning circulation that redistributes heat and nutrients within the Atlantic Ocean. Existing reconstructions have yielded conflicting results on the history of Antarctic Intermediate Water penetration into the Atlantic across the most recent glacial termination. In this study we present leachate, foraminiferal, and detrital neodymium isotope data from three intermediate-depth cores collected from the southern Brazil margin in the South Atlantic covering the past 25?kyr. These results reveal that strong chemical leaching following decarbonation does not extract past seawater neodymium composition in this location. The new foraminiferal records reveal no changes in seawater Nd isotopes during abrupt Northern Hemisphere cold events at these sites. We therefore conclude that there is no evidence for greater incursion of Antarctic Intermediate Water into the South Atlantic during either the Younger Dryas or Heinrich Stadial 1. We do, however, observe more radiogenic Nd isotope values in the intermediate-depth South Atlantic during the mid-Holocene. This radiogenic excursion coincides with evidence for a southward shift in the Southern Hemisphere westerlies that may have resulted in a greater entrainment of radiogenic Pacific-sourced water during intermediate water production in the Atlantic sector of the Southern Ocean. Our intermediate-depth records show similar values to a deglacial foraminiferal Nd isotope record from the deep South Atlantic during the Younger Dryas but are clearly distinct during the Last Glacial Maximum and Heinrich Stadial 1, demonstrating that the South Atlantic remained chemically stratified during Heinrich Stadial 1. Dataset Antarc* Antarctic Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Southern Ocean Pacific ENVELOPE(-46.470330,-46.373333,-27.176667,-27.285000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Center for Marine Environmental Sciences MARUM |
spellingShingle |
Center for Marine Environmental Sciences MARUM Howe, Jacob N W Piotrowski, Alexander M Oppo, Delia W Huang, Kuo-Fang Mulitza, Stefan Chiessi, Cristiano Mazur Blusztajn, Jurek Foraminiferal, leachate and detrial neodymium isotopes from the South Atlantic |
topic_facet |
Center for Marine Environmental Sciences MARUM |
description |
Antarctic Intermediate Water is an essential limb of the Atlantic meridional overturning circulation that redistributes heat and nutrients within the Atlantic Ocean. Existing reconstructions have yielded conflicting results on the history of Antarctic Intermediate Water penetration into the Atlantic across the most recent glacial termination. In this study we present leachate, foraminiferal, and detrital neodymium isotope data from three intermediate-depth cores collected from the southern Brazil margin in the South Atlantic covering the past 25?kyr. These results reveal that strong chemical leaching following decarbonation does not extract past seawater neodymium composition in this location. The new foraminiferal records reveal no changes in seawater Nd isotopes during abrupt Northern Hemisphere cold events at these sites. We therefore conclude that there is no evidence for greater incursion of Antarctic Intermediate Water into the South Atlantic during either the Younger Dryas or Heinrich Stadial 1. We do, however, observe more radiogenic Nd isotope values in the intermediate-depth South Atlantic during the mid-Holocene. This radiogenic excursion coincides with evidence for a southward shift in the Southern Hemisphere westerlies that may have resulted in a greater entrainment of radiogenic Pacific-sourced water during intermediate water production in the Atlantic sector of the Southern Ocean. Our intermediate-depth records show similar values to a deglacial foraminiferal Nd isotope record from the deep South Atlantic during the Younger Dryas but are clearly distinct during the Last Glacial Maximum and Heinrich Stadial 1, demonstrating that the South Atlantic remained chemically stratified during Heinrich Stadial 1. |
format |
Dataset |
author |
Howe, Jacob N W Piotrowski, Alexander M Oppo, Delia W Huang, Kuo-Fang Mulitza, Stefan Chiessi, Cristiano Mazur Blusztajn, Jurek |
author_facet |
Howe, Jacob N W Piotrowski, Alexander M Oppo, Delia W Huang, Kuo-Fang Mulitza, Stefan Chiessi, Cristiano Mazur Blusztajn, Jurek |
author_sort |
Howe, Jacob N W |
title |
Foraminiferal, leachate and detrial neodymium isotopes from the South Atlantic |
title_short |
Foraminiferal, leachate and detrial neodymium isotopes from the South Atlantic |
title_full |
Foraminiferal, leachate and detrial neodymium isotopes from the South Atlantic |
title_fullStr |
Foraminiferal, leachate and detrial neodymium isotopes from the South Atlantic |
title_full_unstemmed |
Foraminiferal, leachate and detrial neodymium isotopes from the South Atlantic |
title_sort |
foraminiferal, leachate and detrial neodymium isotopes from the south atlantic |
publisher |
PANGAEA |
publishDate |
2016 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.874868 https://doi.org/10.1594/PANGAEA.874868 |
op_coverage |
MEDIAN LATITUDE: -27.238112 * MEDIAN LONGITUDE: -46.431777 * SOUTH-BOUND LATITUDE: -27.285000 * WEST-BOUND LONGITUDE: -46.470330 * NORTH-BOUND LATITUDE: -27.176667 * EAST-BOUND LONGITUDE: -46.373333 * DATE/TIME START: 1993-03-03T00:00:00 * DATE/TIME END: 1998-10-14T00:00:00 |
long_lat |
ENVELOPE(-46.470330,-46.373333,-27.176667,-27.285000) |
geographic |
Antarctic Southern Ocean Pacific |
geographic_facet |
Antarctic Southern Ocean Pacific |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Supplement to: Howe, Jacob N W; Piotrowski, Alexander M; Oppo, Delia W; Huang, Kuo-Fang; Mulitza, Stefan; Chiessi, Cristiano Mazur; Blusztajn, Jurek (2016): Antarctic intermediate water circulation in the South Atlantic over the past 25,000 years. Paleoceanography, 31(10), 1302-1314, https://doi.org/10.1002/2016PA002975 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.874868 https://doi.org/10.1594/PANGAEA.874868 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.874868 https://doi.org/10.1002/2016PA002975 |
_version_ |
1766206547064520704 |