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  • Calypso Square Core System; CASQS; IMAGES XV - Pachiderme; Marion Dufresne (1995); MD07-3076; MD07-3076Q; MD159  (2)
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  • 1
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    Planktonic foraminifer assemblages and stable oxygen and carbon isotope record of sediment core MD07-3076Q (2014)
    PANGAEA
    In:  Supplement to: Gottschalk, Julia; Skinner, Luke C; Waelbroeck, Claire (2015): Contribution of seasonal sub-Antarctic surface water variability to millennial-scale changes in atmospheric CO2 over the last deglaciation and Marine Isotope Stage 3. Earth and Planetary Science Letters, 411, 87-99, https://doi.org/10.1016/j.epsl.2014.11.051
    Details
    Publication Date: 2024-02-23
    Description: We report high-resolution planktonic foraminifer census counts and stable oxygen and carbon isotope measurements of the planktonic foraminifera G. bulloides and N. pachyderma s. from sediment core MD07-3076Q for the last deglaciation, the last glacial maximum and Marine Isotope Stage 3. These data provide insights into the marine cycling of carbon and frontal dynamics in the sub-Antarctic Atlantic during the last 68 ka.
    Keywords: Calypso Square Core System; CASQS; IMAGES XV - Pachiderme; Marion Dufresne (1995); MD07-3076; MD07-3076Q; MD159
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 2
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    Changes in bottom water corrosiveness and carbonate ion concentrations in the sub-Antarctic Atlantic during the last glacial period (2015)
    PANGAEA
    In:  Supplement to: Gottschalk, Julia; Skinner, Luke C; Misra, Sambuddha; Waelbroeck, Claire; Menviel, Laurie; Timmermann, Axel (2015): Abrupt changes in the southern extent of North Atlantic Deep Water during Dansgaard–Oeschger events. Nature Geoscience, 8(12), 950-954, https://doi.org/10.1038/ngeo2558
    Details
    Publication Date: 2024-02-23
    Description: The glacial climate system transitioned rapidly between cold (stadial) and warm (interstadial) conditions in the Northern Hemisphere. This variability, referred to as Dansgaard-Oeschger variability, is widely believed to arise from perturbations of the Atlantic Meridional Overturning Circulation. Evidence for such changes during the longer Heinrich stadials has been identified, but direct evidence for overturning circulation changes during Dansgaard-Oeschger events has proven elusive. Here we reconstruct bottom water [CO3]2- variability from B/Ca ratios of benthic foraminifera and indicators of sedimentary dissolution, and use these reconstructions to infer the flow of northern-sourced deep water to the deep central sub-Antarctic Atlantic Ocean. We find that nearly every Dansgaard-Oeschger interstadial is accompanied by a rapid incursion of North Atlantic Deep Water into the deep South Atlantic. Based on these results and transient climate model simulations, we conclude that North Atlantic stadial-interstadial climate variability was associated with significant Atlantic overturning circulation changes that were rapidly transmitted across the Atlantic. However, by demonstrating the persistent role of Atlantic overturning circulation changes in past abrupt climate variability, our reconstructions of carbonate chemistry further indicate that the carbon cycle response to abrupt climate change was not a simple function of North Atlantic overturning.
    Keywords: Calypso Square Core System; CASQS; IMAGES XV - Pachiderme; Marion Dufresne (1995); MD07-3076; MD07-3076Q; MD159
    Type: Dataset
    Format: application/zip, 4 datasets
    Location Call Number Expected Availability
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    DATA PANGAEA
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