Rosenthal, Yair; Boyle, Edward A; Labeyrie, Laurent D (1997): Isotope rates and Cd/Ca ratios in benthic foraminifera from the Southern Ocean [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.868710, Supplement to: Rosenthal, Y et al. (1997): Last Glacial Maximum paleochemistry and deepwater circulation in the Southern Ocean: Evidence from foraminiferal cadmium. Paleoceanography, 12(6), 787-796, https://doi.org/10.1029/97PA02508
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Abstract:
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.
Other version:
Rosenthal, Yair; Boyle, Edward A; Labeyrie, Laurent D (1997): NOAA/WDS Paleoclimatology - Southern Ocean Deepwater circulation during the last glacial maximum. NOAA National Centers for Environmental Information, https://doi.org/10.25921/FK1W-J329
Coverage:
Median Latitude: -45.911250 * Median Longitude: 86.519667 * South-bound Latitude: -46.069333 * West-bound Longitude: 82.928167 * North-bound Latitude: -45.753167 * East-bound Longitude: 90.111167
Date/Time Start: 1988-02-01T00:00:00 * Date/Time End: 1988-02-01T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Rosenthal, Y; Boyle, EA; Labeyrie, LD (1997): (Table S3) Isotopic data and Cd/Ca ratios in benthic foraminifera from sediment core MD88-768. https://doi.org/10.1594/PANGAEA.868708
- Rosenthal, Y; Boyle, EA; Labeyrie, LD (1997): (Table S2) Isotopic data and Cd/Ca ratios in benthic foraminifera from sediment core MD88-769. https://doi.org/10.1594/PANGAEA.868709