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Gottschalk, Julia; Skinner, Luke C; Misra, Sambuddha; Waelbroeck, Claire; Menviel, Laurie; Timmermann, Axel (2015): Changes in bottom water corrosiveness and carbonate ion concentrations in the sub-Antarctic Atlantic during the last glacial period [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.841244, Supplement to: Gottschalk, J et al. (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

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Abstract:
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.
Coverage:
Latitude: -44.153330 * Longitude: -14.228170
Event(s):
MD07-3076 (MD07-3076Q) * Latitude: -44.153330 * Longitude: -14.228170 * Elevation: -3770.0 m * Campaign: MD159 (IMAGES XV - Pachiderme) * Basis: Marion Dufresne (1995) * Method/Device: Calypso Square Core System (CASQS)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Gottschalk, J; Skinner, LC; Misra, S et al. (2015): LOVECLIM model data time series during MIS3. https://doi.org/10.1594/PANGAEA.848720
  2. Gottschalk, J; Skinner, LC; Misra, S et al. (2015): LOVECLIM model data of deep sub-Antarctic Atlantic carbonate ion changes during MIS 3. https://doi.org/10.1594/PANGAEA.848719
  3. Gottschalk, J; Skinner, LC; Misra, S et al. (2015): Cibicides kullenbergi B/Ca measurements in sub-Antarctic sediment core MD07-3076Q (last 68 ka). https://doi.org/10.1594/PANGAEA.841241
  4. Gottschalk, J; Skinner, LC; Misra, S et al. (2015): Changes in bottom water corrosiveness in the sub-Antarctic Atlantic during the last glacial period based on foraminifer fragmentation and assemblage variations. https://doi.org/10.1594/PANGAEA.839863