Neodymium isotopes, planktic and benthic stable carbon and oxygen isotopes, sortable silt and percentage CaCO3 from sediment core TT1811-34GGC, SE Indian Ocean
Neodymium isotope data measured on mixed species of uncleaned planktic foraminifera, planktic (G. bulloides) and benthic (C. kullenbergi) stable carbon and oxygen isotopes, mean sortable silt size fraction measurements and CaCO3 contents of sediments from giant gravity core TT1811-34GGC, located wit...
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.932953 https://doi.org/10.1594/PANGAEA.932953 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.932953 2024-06-23T07:45:55+00:00 Neodymium isotopes, planktic and benthic stable carbon and oxygen isotopes, sortable silt and percentage CaCO3 from sediment core TT1811-34GGC, SE Indian Ocean Williams, Thomas John Sikes, Elisabeth L Martin, Ellen E Starr, Aidan Umling, Natalie E Glaubke, Ryan LATITUDE: -41.718000 * LONGITUDE: 80.163000 * MINIMUM DEPTH, sediment/rock: 0.005 m * MAXIMUM DEPTH, sediment/rock: 3.065 m 2021 text/tab-separated-values, 796 data points https://doi.pangaea.de/10.1594/PANGAEA.932953 https://doi.org/10.1594/PANGAEA.932953 en eng PANGAEA Williams, Thomas John; Martin, Ellen E; Sikes, Elisabeth L; Starr, Aidan; Umling, Natalie E; Glaubke, Ryan (2021): Neodymium isotope evidence for coupled Southern Ocean circulation and Antarctic climate throughout the last 118,000 years. Quaternary Science Reviews, 260, 106915, https://doi.org/10.1016/j.quascirev.2021.106915 https://doi.pangaea.de/10.1594/PANGAEA.932953 https://doi.org/10.1594/PANGAEA.932953 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess AGE Calcium carbonate Cibicidoides kullenbergi δ18O Depth bottom/max sediment/rock top/min GGC Giant gravity corer Globigerina bulloides Grain size mean Indian Ocean Neodymium isotope sortable silt Southern Ocean Stable isotope Standard error TT1811-34GGC ε-Neodymium error Dataset 2021 ftpangaea https://doi.org/10.1594/PANGAEA.93295310.1016/j.quascirev.2021.106915 2024-06-12T14:17:12Z Neodymium isotope data measured on mixed species of uncleaned planktic foraminifera, planktic (G. bulloides) and benthic (C. kullenbergi) stable carbon and oxygen isotopes, mean sortable silt size fraction measurements and CaCO3 contents of sediments from giant gravity core TT1811-34GGC, located within the SE Indian/Southern Ocean. Data span the last glacial cycle, from 118,000 years B.P. to the late Holocene. The chain of events surrounding the initiation and intensification of the last glacial cycle remain relatively poorly understood. In particular, the role of Southern Ocean paleocirculation changes is poorly constrained, in part, owing to a paucity of sedimentary records from this region. In this study we present multiproxy data – including neodymium isotope and sortable silt measurements – for paleocirculation changes within the deep (3167 m water depth) Indian sector of the Southern Ocean from a new sediment core, TT1811-34GGC (41.718°S, 80.163°E). We find a tight coupling between circulation changes, Antarctic climate, and atmospheric CO2 concentrations throughout the last 118,000 years, even during the initial stages of glacial inception of Marine Isotope Stage (MIS) 5.4 to 5.1. We find that periods of cooling correspond to reductions in the entrainment of North Atlantic-sourced waters within the deep Southern Ocean, as evidenced by more radiogenic neodymium isotope values of deep water bathing our core site. Cooling also corresponds to generally slower bottom water flow speeds, as indicated by finer sortable silt size fractions. A reduction in entrainment of North-Atlantic sourced waters occurred during MIS 5.4-5.1, when Atlantic circulation was strong, suggesting a Southern hemisphere control on paleocirculation changes at that time. We hypothesize that expanded Southern Ocean sea-ice during MIS 5.4 increased the density of the deep Southern Ocean, reducing the ability of Atlantic-sourced waters to mix into the deep Southern Ocean. This led to an expanded contribution of Pacific Deep Water within the ... Dataset Antarc* Antarctic North Atlantic Sea ice Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Indian Pacific Southern Ocean ENVELOPE(80.163000,80.163000,-41.718000,-41.718000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
AGE Calcium carbonate Cibicidoides kullenbergi δ18O Depth bottom/max sediment/rock top/min GGC Giant gravity corer Globigerina bulloides Grain size mean Indian Ocean Neodymium isotope sortable silt Southern Ocean Stable isotope Standard error TT1811-34GGC ε-Neodymium error |
spellingShingle |
AGE Calcium carbonate Cibicidoides kullenbergi δ18O Depth bottom/max sediment/rock top/min GGC Giant gravity corer Globigerina bulloides Grain size mean Indian Ocean Neodymium isotope sortable silt Southern Ocean Stable isotope Standard error TT1811-34GGC ε-Neodymium error Williams, Thomas John Sikes, Elisabeth L Martin, Ellen E Starr, Aidan Umling, Natalie E Glaubke, Ryan Neodymium isotopes, planktic and benthic stable carbon and oxygen isotopes, sortable silt and percentage CaCO3 from sediment core TT1811-34GGC, SE Indian Ocean |
topic_facet |
AGE Calcium carbonate Cibicidoides kullenbergi δ18O Depth bottom/max sediment/rock top/min GGC Giant gravity corer Globigerina bulloides Grain size mean Indian Ocean Neodymium isotope sortable silt Southern Ocean Stable isotope Standard error TT1811-34GGC ε-Neodymium error |
description |
Neodymium isotope data measured on mixed species of uncleaned planktic foraminifera, planktic (G. bulloides) and benthic (C. kullenbergi) stable carbon and oxygen isotopes, mean sortable silt size fraction measurements and CaCO3 contents of sediments from giant gravity core TT1811-34GGC, located within the SE Indian/Southern Ocean. Data span the last glacial cycle, from 118,000 years B.P. to the late Holocene. The chain of events surrounding the initiation and intensification of the last glacial cycle remain relatively poorly understood. In particular, the role of Southern Ocean paleocirculation changes is poorly constrained, in part, owing to a paucity of sedimentary records from this region. In this study we present multiproxy data – including neodymium isotope and sortable silt measurements – for paleocirculation changes within the deep (3167 m water depth) Indian sector of the Southern Ocean from a new sediment core, TT1811-34GGC (41.718°S, 80.163°E). We find a tight coupling between circulation changes, Antarctic climate, and atmospheric CO2 concentrations throughout the last 118,000 years, even during the initial stages of glacial inception of Marine Isotope Stage (MIS) 5.4 to 5.1. We find that periods of cooling correspond to reductions in the entrainment of North Atlantic-sourced waters within the deep Southern Ocean, as evidenced by more radiogenic neodymium isotope values of deep water bathing our core site. Cooling also corresponds to generally slower bottom water flow speeds, as indicated by finer sortable silt size fractions. A reduction in entrainment of North-Atlantic sourced waters occurred during MIS 5.4-5.1, when Atlantic circulation was strong, suggesting a Southern hemisphere control on paleocirculation changes at that time. We hypothesize that expanded Southern Ocean sea-ice during MIS 5.4 increased the density of the deep Southern Ocean, reducing the ability of Atlantic-sourced waters to mix into the deep Southern Ocean. This led to an expanded contribution of Pacific Deep Water within the ... |
format |
Dataset |
author |
Williams, Thomas John Sikes, Elisabeth L Martin, Ellen E Starr, Aidan Umling, Natalie E Glaubke, Ryan |
author_facet |
Williams, Thomas John Sikes, Elisabeth L Martin, Ellen E Starr, Aidan Umling, Natalie E Glaubke, Ryan |
author_sort |
Williams, Thomas John |
title |
Neodymium isotopes, planktic and benthic stable carbon and oxygen isotopes, sortable silt and percentage CaCO3 from sediment core TT1811-34GGC, SE Indian Ocean |
title_short |
Neodymium isotopes, planktic and benthic stable carbon and oxygen isotopes, sortable silt and percentage CaCO3 from sediment core TT1811-34GGC, SE Indian Ocean |
title_full |
Neodymium isotopes, planktic and benthic stable carbon and oxygen isotopes, sortable silt and percentage CaCO3 from sediment core TT1811-34GGC, SE Indian Ocean |
title_fullStr |
Neodymium isotopes, planktic and benthic stable carbon and oxygen isotopes, sortable silt and percentage CaCO3 from sediment core TT1811-34GGC, SE Indian Ocean |
title_full_unstemmed |
Neodymium isotopes, planktic and benthic stable carbon and oxygen isotopes, sortable silt and percentage CaCO3 from sediment core TT1811-34GGC, SE Indian Ocean |
title_sort |
neodymium isotopes, planktic and benthic stable carbon and oxygen isotopes, sortable silt and percentage caco3 from sediment core tt1811-34ggc, se indian ocean |
publisher |
PANGAEA |
publishDate |
2021 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.932953 https://doi.org/10.1594/PANGAEA.932953 |
op_coverage |
LATITUDE: -41.718000 * LONGITUDE: 80.163000 * MINIMUM DEPTH, sediment/rock: 0.005 m * MAXIMUM DEPTH, sediment/rock: 3.065 m |
long_lat |
ENVELOPE(80.163000,80.163000,-41.718000,-41.718000) |
geographic |
Antarctic Indian Pacific Southern Ocean |
geographic_facet |
Antarctic Indian Pacific Southern Ocean |
genre |
Antarc* Antarctic North Atlantic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic North Atlantic Sea ice Southern Ocean |
op_relation |
Williams, Thomas John; Martin, Ellen E; Sikes, Elisabeth L; Starr, Aidan; Umling, Natalie E; Glaubke, Ryan (2021): Neodymium isotope evidence for coupled Southern Ocean circulation and Antarctic climate throughout the last 118,000 years. Quaternary Science Reviews, 260, 106915, https://doi.org/10.1016/j.quascirev.2021.106915 https://doi.pangaea.de/10.1594/PANGAEA.932953 https://doi.org/10.1594/PANGAEA.932953 |
op_rights |
CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.93295310.1016/j.quascirev.2021.106915 |
_version_ |
1802642999401775104 |