Isotope rates and Cd/Ca ratios in benthic foraminifera from the Southern Ocean, supplement to: Rosenthal, Yair; Boyle, Edwards A; Labeyrie, Laurent D (1997): Last Glacial Maximum paleochemistry and deepwater circulation in the Southern Ocean: Evidence from foraminiferal cadmium. Paleoceanography, 12(6), 787-796
South Atlantic benthic foraminiferal Cd/Ca shows no glacial-interglacial variation, suggesting that the glacial contribution of North Atlantic Deep Water to the Southern Ocean was not much different than at present. In contrast, Cd/Ca in southeast Indian Ridge cores show lower glacial bottom water C...
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ftdatacite:10.1594/pangaea.868710 2023-05-15T13:59:27+02:00 Isotope rates and Cd/Ca ratios in benthic foraminifera from the Southern Ocean, supplement to: Rosenthal, Yair; Boyle, Edwards A; Labeyrie, Laurent D (1997): Last Glacial Maximum paleochemistry and deepwater circulation in the Southern Ocean: Evidence from foraminiferal cadmium. Paleoceanography, 12(6), 787-796 Rosenthal, Yair Boyle, Edwards A Labeyrie, Laurent D 1997 application/zip https://dx.doi.org/10.1594/pangaea.868710 https://doi.pangaea.de/10.1594/PANGAEA.868710 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://www.ncdc.noaa.gov/paleo/study/2525 https://dx.doi.org/10.1029/97pa02508 https://www.ncdc.noaa.gov/paleo/study/2525 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY article Supplementary Collection of Datasets Collection 1997 ftdatacite https://doi.org/10.1594/pangaea.868710 https://doi.org/10.1029/97pa02508 2022-02-09T13:31:34Z South Atlantic benthic foraminiferal Cd/Ca shows no glacial-interglacial variation, suggesting that the glacial contribution of North Atlantic Deep Water to the Southern Ocean was not much different than at present. In contrast, Cd/Ca in southeast Indian Ridge cores show lower glacial bottom water Cd, comparable to levels in intermediate depths of the North Atlantic and significantly lower than in the deep South Atlantic. Low glacial Cd/Ca was also recorded in planktonic foraminifera, suggesting a substantial decrease in the nutrient concentration of Subantarctic surface water during the glacial maximum which most likely was caused by increased biological productivity. The Cd data are inconsistent with low glacial benthic foraminiferal d13C which suggest higher nutrient concentration. We propose that the low Cd/Ca in the Southeast Indian Ridge records reflects a local source of nutrient-depleted deepwater, formed during the last glacial maximum by open-ocean convection near the Antarctic Polar Front, downstream of the Kerguelene Plateau. If this source was limited to the southeast Indian basin then its impact on the overall chemistry of glacial Circumpolar Deepwater was rather small. However, if during glaciations open-ocean convection became the dominant mode of bottom water formation, it might have had a greater impact on CPDW chemistry. Article in Journal/Newspaper Antarc* Antarctic North Atlantic Deep Water North Atlantic Planktonic foraminifera Southern Ocean DataCite Metadata Store (German National Library of Science and Technology) Antarctic Southern Ocean The Antarctic Indian Southeast Indian Ridge ENVELOPE(110.000,110.000,-50.000,-50.000) Rosenthal ENVELOPE(-64.283,-64.283,-64.600,-64.600) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
description |
South Atlantic benthic foraminiferal Cd/Ca shows no glacial-interglacial variation, suggesting that the glacial contribution of North Atlantic Deep Water to the Southern Ocean was not much different than at present. In contrast, Cd/Ca in southeast Indian Ridge cores show lower glacial bottom water Cd, comparable to levels in intermediate depths of the North Atlantic and significantly lower than in the deep South Atlantic. Low glacial Cd/Ca was also recorded in planktonic foraminifera, suggesting a substantial decrease in the nutrient concentration of Subantarctic surface water during the glacial maximum which most likely was caused by increased biological productivity. The Cd data are inconsistent with low glacial benthic foraminiferal d13C which suggest higher nutrient concentration. We propose that the low Cd/Ca in the Southeast Indian Ridge records reflects a local source of nutrient-depleted deepwater, formed during the last glacial maximum by open-ocean convection near the Antarctic Polar Front, downstream of the Kerguelene Plateau. If this source was limited to the southeast Indian basin then its impact on the overall chemistry of glacial Circumpolar Deepwater was rather small. However, if during glaciations open-ocean convection became the dominant mode of bottom water formation, it might have had a greater impact on CPDW chemistry. |
format |
Article in Journal/Newspaper |
author |
Rosenthal, Yair Boyle, Edwards A Labeyrie, Laurent D |
spellingShingle |
Rosenthal, Yair Boyle, Edwards A Labeyrie, Laurent D Isotope rates and Cd/Ca ratios in benthic foraminifera from the Southern Ocean, supplement to: Rosenthal, Yair; Boyle, Edwards A; Labeyrie, Laurent D (1997): Last Glacial Maximum paleochemistry and deepwater circulation in the Southern Ocean: Evidence from foraminiferal cadmium. Paleoceanography, 12(6), 787-796 |
author_facet |
Rosenthal, Yair Boyle, Edwards A Labeyrie, Laurent D |
author_sort |
Rosenthal, Yair |
title |
Isotope rates and Cd/Ca ratios in benthic foraminifera from the Southern Ocean, supplement to: Rosenthal, Yair; Boyle, Edwards A; Labeyrie, Laurent D (1997): Last Glacial Maximum paleochemistry and deepwater circulation in the Southern Ocean: Evidence from foraminiferal cadmium. Paleoceanography, 12(6), 787-796 |
title_short |
Isotope rates and Cd/Ca ratios in benthic foraminifera from the Southern Ocean, supplement to: Rosenthal, Yair; Boyle, Edwards A; Labeyrie, Laurent D (1997): Last Glacial Maximum paleochemistry and deepwater circulation in the Southern Ocean: Evidence from foraminiferal cadmium. Paleoceanography, 12(6), 787-796 |
title_full |
Isotope rates and Cd/Ca ratios in benthic foraminifera from the Southern Ocean, supplement to: Rosenthal, Yair; Boyle, Edwards A; Labeyrie, Laurent D (1997): Last Glacial Maximum paleochemistry and deepwater circulation in the Southern Ocean: Evidence from foraminiferal cadmium. Paleoceanography, 12(6), 787-796 |
title_fullStr |
Isotope rates and Cd/Ca ratios in benthic foraminifera from the Southern Ocean, supplement to: Rosenthal, Yair; Boyle, Edwards A; Labeyrie, Laurent D (1997): Last Glacial Maximum paleochemistry and deepwater circulation in the Southern Ocean: Evidence from foraminiferal cadmium. Paleoceanography, 12(6), 787-796 |
title_full_unstemmed |
Isotope rates and Cd/Ca ratios in benthic foraminifera from the Southern Ocean, supplement to: Rosenthal, Yair; Boyle, Edwards A; Labeyrie, Laurent D (1997): Last Glacial Maximum paleochemistry and deepwater circulation in the Southern Ocean: Evidence from foraminiferal cadmium. Paleoceanography, 12(6), 787-796 |
title_sort |
isotope rates and cd/ca ratios in benthic foraminifera from the southern ocean, supplement to: rosenthal, yair; boyle, edwards a; labeyrie, laurent d (1997): last glacial maximum paleochemistry and deepwater circulation in the southern ocean: evidence from foraminiferal cadmium. paleoceanography, 12(6), 787-796 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
1997 |
url |
https://dx.doi.org/10.1594/pangaea.868710 https://doi.pangaea.de/10.1594/PANGAEA.868710 |
long_lat |
ENVELOPE(110.000,110.000,-50.000,-50.000) ENVELOPE(-64.283,-64.283,-64.600,-64.600) |
geographic |
Antarctic Southern Ocean The Antarctic Indian Southeast Indian Ridge Rosenthal |
geographic_facet |
Antarctic Southern Ocean The Antarctic Indian Southeast Indian Ridge Rosenthal |
genre |
Antarc* Antarctic North Atlantic Deep Water North Atlantic Planktonic foraminifera Southern Ocean |
genre_facet |
Antarc* Antarctic North Atlantic Deep Water North Atlantic Planktonic foraminifera Southern Ocean |
op_relation |
https://www.ncdc.noaa.gov/paleo/study/2525 https://dx.doi.org/10.1029/97pa02508 https://www.ncdc.noaa.gov/paleo/study/2525 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.868710 https://doi.org/10.1029/97pa02508 |
_version_ |
1766268008350613504 |