Gottschalk, Julia; Skinner, Luke C; Lippold, Jörg; Jaccard, Samuel L; Vogel, Hendrik; Frank, Norbert; Waelbroeck, Claire (2015): Productivity- and ocean circulation changes in the sub-Antarctic Atlantic during the last deglaciation and Marine Isotope Stage 3 [dataset publication series]. Department of Earth Sciences, University of Cambridge, PANGAEA, https://doi.org/10.1594/PANGAEA.845078
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Abstract:
Millennial-scale climate changes during the last glacial period and deglaciation were accompanied by rapid changes in atmospheric CO2 that remain unexplained. While the role of the Southern Ocean as a 'control valve' on ocean-atmosphere CO2 exchange has been emphasized, the exact nature of this role, in particular the relative contributions of physical (for example, ocean dynamics and air-sea gas exchange) versus biological processes (for example, export productivity), remains poorly constrained. Here we combine reconstructions of bottom-water [O2], export production and 14C ventilation ages in the sub-Antarctic Atlantic, and show that atmospheric CO2 pulses during the last glacial- and deglacial periods were consistently accompanied by decreases in the biological export of carbon and increases in deep-ocean ventilation via southern-sourced water masses. These findings demonstrate how the Southern Ocean's 'organic carbon pump' has exerted a tight control on atmospheric CO2, and thus global climate, specifically via a synergy of both physical and biological processes.
Related to:
Gottschalk, Julia; Skinner, Luke C; Lippold, Jörg; Vogel, Hendrik; Frank, Norbert; Jaccard, Samuel L; Waelbroeck, Claire (2016): Biological and physical controls in the Southern Ocean on past millennial-scale atmospheric CO2 changes. Nature Communications, 7(11539), https://doi.org/10.1038/ncomms11539
Coverage:
Latitude: -44.153330 * Longitude: -14.228170
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
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Datasets listed in this publication series
- Gottschalk, J; Skinner, LC; Lippold, J et al. (2015): Changes in bottom water oxygenation in the sub-Antarctic Atlantic during the last 68 kyrs, sediment core MD07-3076Q. https://doi.org/10.1594/PANGAEA.845075
- Gottschalk, J; Skinner, LC; Lippold, J et al. (2015): Opal in sediment core MD07-3076Q during the last 68 kyrs. https://doi.org/10.1594/PANGAEA.845076
- Gottschalk, J; Skinner, LC; Lippold, J et al. (2015): Redox-sensitive element accumulation in authigenic coatings of G. bulloides and Uvigerina spp. during the last 68 kyrs in sediment core MD07-3076Q. https://doi.org/10.1594/PANGAEA.845077