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Orbital- and millennial-scale Antarctic Circumpolar Current variability in Drake Passage over the past 140,000 years

Authors

Wu,  Shuzhuang
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Lembke-Jene,  Lester
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Lamy,  Frank
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Arz,  Helge W.
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Nowaczyk,  N.
4.3 Climate Dynamics and Landscape Evolution, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Xiao,  Wenshen
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Zhang,  Xu
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Hass,  H. Christian
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Titschack,  Jürgen
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Zheng,  Xufeng
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Liu,  Jiabo
4.3 Climate Dynamics and Landscape Evolution, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Dumm,  Levin
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Diekmann,  Bernhard
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Nürnberg,  Dirk
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Tiedemann,  Ralf
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Kuhn,  Gerhard
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Citation

Wu, S., Lembke-Jene, L., Lamy, F., Arz, H. W., Nowaczyk, N., Xiao, W., Zhang, X., Hass, H. C., Titschack, J., Zheng, X., Liu, J., Dumm, L., Diekmann, B., Nürnberg, D., Tiedemann, R., Kuhn, G. (2021): Orbital- and millennial-scale Antarctic Circumpolar Current variability in Drake Passage over the past 140,000 years. - Nature Communications, 12, 3948.
https://doi.org/10.1038/s41467-021-24264-9


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5007444
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.