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Wu, Shuzhuang; Lembke-Jene, Lester; Lamy, Frank; Arz, Helge Wolfgang; Nowaczyk, Norbert R; Xiao, Wenshen; Zhang, Xu; Hass, H Christian; Titschack, Jürgen; Zheng, Xufeng; Liu, Jiabo; Dumm, Levin; Diekmann, Bernhard; Nürnberg, Dirk; Tiedemann, Ralf; Kuhn, Gerhard (2020): Antarctic Circumpolar Current (ACC) analysis of sediment core PS97/085-3 from POLARSTERN cruise PS97 (ANT-XXXI/3) in the Drake Passage [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.923843

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Abstract:
The Antarctic Circumpolar Current (ACC) plays a crucial role in global ocean circulation by fostering deep-water upwelling and formation of new water masses. On geological time-scales, ACC variations are poorly constrained beyond the last glacial. Here, we reconstruct changes in ACC strength in the central Drake Passage in vicinity of the modern Polar Front over a complete glacial-interglacial cycle (i.e., the past 140,000 years), based on sediment grain-size and geochemical characteristics. We found significant glacial-interglacial changes of ACC flow speed, with weakened current strength during glacials and a stronger circulation in interglacials. Superimposed on these orbital-scale changes are high-amplitude millennial-scale fluctuations, with ACC strength maxima correlating with diatom-based Antarctic winter sea-ice minima, particularly during full glacial conditions. We infer that the ACC is closely linked to Southern Hemisphere millennial-scale climate oscillations, amplified through Antarctic sea ice extent changes. These strong ACC variations modulated Pacific-Atlantic water exchange via the “cold water route” and potentially affected the Atlantic Meridional Overturning Circulation and marine carbon storage.
Keyword(s):
Antarctic Circumpolar Current; Drake Passage; Grain Size
Supplement to:
Wu, Shuzhuang; Lembke-Jene, Lester; Lamy, Frank; Arz, Helge Wolfgang; Nowaczyk, Norbert R; Xiao, Wenshen; Zhang, Xu; Hass, H Christian; Titschack, Jürgen; Zheng, Xufeng; Liu, Jiabo; Dumm, Levin; Diekmann, Bernhard; Nürnberg, Dirk; Tiedemann, Ralf; Kuhn, Gerhard (2021): Orbital- and millennial-scale Antarctic Circumpolar Current variability in Drake Passage over the past 140,000 years. Nature Communications, 12(1), https://doi.org/10.1038/s41467-021-24264-9
Related to:
Wu, Shuzhuang; Lembke-Jene, Lester; Lamy, Frank; Arz, Helge Wolfgang; Nowaczyk, Norbert R; Xiao, Wenshen; Zhang, Xu; Hass, H Christian; Titschack, Jürgen; Zheng, Xufeng; Liu, Jiabo; Dumm, Levin; Diekmann, Bernhard; Nürnberg, Dirk; Tiedemann, Ralf; Kuhn, Gerhard (2022): Bulk properties composition of sediment core PS97/085-3 from POLARSTERN cruise PS97 (ANT-XXXI/3) in the Drake Passage. PANGAEA, https://doi.org/10.1594/PANGAEA.952802
Project(s):
Polar Terrestrial Environmental Systems @ AWI (AWI_Envi)
Coverage:
Latitude: -58.354500 * Longitude: -62.167170
Date/Time Start: 2016-03-16T17:45:00 * Date/Time End: 2016-03-16T17:45:00
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
6 datasets

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Datasets listed in this bundled publication

  1. Wu, S; Lembke-Jene, L; Lamy, F et al. (2020): Age point analysis of sediment core PS97/085-3 from POLARSTERN cruise PS97 (ANT-XXXI/3) in the Drake Passage. https://doi.org/10.1594/PANGAEA.923842
  2. Wu, S; Lembke-Jene, L; Lamy, F et al. (2020): X-ray fluorescence on sediment core PS97/085-3 from POLARSTERN cruise PS97 (ANT-XXXI/3) in the Drake Passage. https://doi.org/10.1594/PANGAEA.923839
  3. Wu, S; Lembke-Jene, L; Lamy, F et al. (2020): High-resolution grain size properties of sediment core PS97/085-3 from POLARSTERN cruise PS97 (ANT-XXXI/3) in the Drake Passage. https://doi.org/10.1594/PANGAEA.923837
  4. Wu, S; Lembke-Jene, L; Lamy, F et al. (2020): Ice-rafted debris measured by computed scan of sediment core PS97/085-3 from POLARSTERN cruise PS97 (ANT-XXXI/3). https://doi.org/10.1594/PANGAEA.923838
  5. Wu, S; Lembke-Jene, L; Lamy, F et al. (2020): Magnetic susceptibility of sediment core PS97/085-3 from POLARSTERN cruise PS97 (ANT-XXXI/3) in the Drake Passage. https://doi.org/10.1594/PANGAEA.923840
  6. Wu, S; Lembke-Jene, L; Lamy, F et al. (2020): Relative paleointensity of sediment core PS97/085-3 from POLARSTERN cruise PS97 (ANT-XXXI/3) in the Drake Passage. https://doi.org/10.1594/PANGAEA.923841