Orbital- and millennial-scale Antarctic Circumpolar Current variability in Drake Passage over the past 140,000 years
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 timescales, ACC variations are poorly constrained beyond the last glacial. Here, we reconstruct changes in ACC strength in the c...
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Online Access: | https://epic.awi.de/id/eprint/54280/ https://doi.org/10.1038/s41467-021-24264-9 https://hdl.handle.net/10013/epic.ee88fa51-ef51-437b-bffe-d83160507789 |
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ftawi:oai:epic.awi.de:54280 2024-09-15T17:42:04+00:00 Orbital- and millennial-scale Antarctic Circumpolar Current variability in Drake Passage over the past 140,000 years Wu, Shuzhuang Lembke-Jene, Lester Lamy, Frank Arz, Helge W Nowaczyk, Norbert Xiao, Wenshen Zhang, Xu Hass, H Christian Titschack, Jürgen Zheng, Xufeng Liu, Jiabo Dumm, Levin Diekmann, Bernhard Nürnberg, Dirk Tiedemann, Ralf Kuhn, Gerhard 2021 https://epic.awi.de/id/eprint/54280/ https://doi.org/10.1038/s41467-021-24264-9 https://hdl.handle.net/10013/epic.ee88fa51-ef51-437b-bffe-d83160507789 unknown Springer Nature Wu, S. , Lembke-Jene, L. orcid:0000-0002-6873-8533 , Lamy, F. orcid:0000-0001-5952-1765 , 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. orcid:0000-0001-7211-8049 and Kuhn, G. orcid:0000-0001-6069-7485 (2021) Orbital- and millennial-scale Antarctic Circumpolar Current variability in Drake Passage over the past 140,000 years , Nature Communications, 12 (1), pp. 1-9 . doi:10.1038/s41467-021-24264-9 <https://doi.org/10.1038/s41467-021-24264-9> , hdl:10013/epic.ee88fa51-ef51-437b-bffe-d83160507789 EPIC3Nature Communications, Springer Nature, 12(1), pp. 1-9, ISSN: 2041-1723 Article isiRev 2021 ftawi https://doi.org/10.1038/s41467-021-24264-9 2024-06-24T04:27:29Z 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 timescales, 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 millennialscale 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. Article in Journal/Newspaper Antarc* Antarctic Drake Passage Sea ice Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Nature Communications 12 1 |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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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 timescales, 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 millennialscale 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. |
format |
Article in Journal/Newspaper |
author |
Wu, Shuzhuang Lembke-Jene, Lester Lamy, Frank Arz, Helge W Nowaczyk, Norbert Xiao, Wenshen Zhang, Xu Hass, H Christian Titschack, Jürgen Zheng, Xufeng Liu, Jiabo Dumm, Levin Diekmann, Bernhard Nürnberg, Dirk Tiedemann, Ralf Kuhn, Gerhard |
spellingShingle |
Wu, Shuzhuang Lembke-Jene, Lester Lamy, Frank Arz, Helge W Nowaczyk, Norbert Xiao, Wenshen Zhang, Xu Hass, H Christian Titschack, Jürgen Zheng, Xufeng Liu, Jiabo Dumm, Levin Diekmann, Bernhard Nürnberg, Dirk Tiedemann, Ralf Kuhn, Gerhard Orbital- and millennial-scale Antarctic Circumpolar Current variability in Drake Passage over the past 140,000 years |
author_facet |
Wu, Shuzhuang Lembke-Jene, Lester Lamy, Frank Arz, Helge W Nowaczyk, Norbert Xiao, Wenshen Zhang, Xu Hass, H Christian Titschack, Jürgen Zheng, Xufeng Liu, Jiabo Dumm, Levin Diekmann, Bernhard Nürnberg, Dirk Tiedemann, Ralf Kuhn, Gerhard |
author_sort |
Wu, Shuzhuang |
title |
Orbital- and millennial-scale Antarctic Circumpolar Current variability in Drake Passage over the past 140,000 years |
title_short |
Orbital- and millennial-scale Antarctic Circumpolar Current variability in Drake Passage over the past 140,000 years |
title_full |
Orbital- and millennial-scale Antarctic Circumpolar Current variability in Drake Passage over the past 140,000 years |
title_fullStr |
Orbital- and millennial-scale Antarctic Circumpolar Current variability in Drake Passage over the past 140,000 years |
title_full_unstemmed |
Orbital- and millennial-scale Antarctic Circumpolar Current variability in Drake Passage over the past 140,000 years |
title_sort |
orbital- and millennial-scale antarctic circumpolar current variability in drake passage over the past 140,000 years |
publisher |
Springer Nature |
publishDate |
2021 |
url |
https://epic.awi.de/id/eprint/54280/ https://doi.org/10.1038/s41467-021-24264-9 https://hdl.handle.net/10013/epic.ee88fa51-ef51-437b-bffe-d83160507789 |
genre |
Antarc* Antarctic Drake Passage Sea ice |
genre_facet |
Antarc* Antarctic Drake Passage Sea ice |
op_source |
EPIC3Nature Communications, Springer Nature, 12(1), pp. 1-9, ISSN: 2041-1723 |
op_relation |
Wu, S. , Lembke-Jene, L. orcid:0000-0002-6873-8533 , Lamy, F. orcid:0000-0001-5952-1765 , 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. orcid:0000-0001-7211-8049 and Kuhn, G. orcid:0000-0001-6069-7485 (2021) Orbital- and millennial-scale Antarctic Circumpolar Current variability in Drake Passage over the past 140,000 years , Nature Communications, 12 (1), pp. 1-9 . doi:10.1038/s41467-021-24264-9 <https://doi.org/10.1038/s41467-021-24264-9> , hdl:10013/epic.ee88fa51-ef51-437b-bffe-d83160507789 |
op_doi |
https://doi.org/10.1038/s41467-021-24264-9 |
container_title |
Nature Communications |
container_volume |
12 |
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1 |
_version_ |
1810488446012096512 |