Antarctic Circumpolar Current (ACC) analysis of sediment core PS97/085-3 from POLARSTERN cruise PS97 (ANT-XXXI/3) in the Drake Passage
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2020
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| _version_ | 1867170475675746304 |
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| author | 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 |
| author_facet | 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 |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_923843 |
| institution | PANGAEA |
| language | en |
| publishDate | 2020 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Antarctic Circumpolar Current (ACC) analysis of sediment core PS97/085-3 from POLARSTERN cruise PS97 (ANT-XXXI/3) in the Drake Passage 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 Antarctic Circumpolar Current; AWI_Envi; Drake Passage; Grain Size; Polar Terrestrial Environmental Systems @ AWI 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. |
| title | Antarctic Circumpolar Current (ACC) analysis of sediment core PS97/085-3 from POLARSTERN cruise PS97 (ANT-XXXI/3) in the Drake Passage |
| topic | Antarctic Circumpolar Current; AWI_Envi; Drake Passage; Grain Size; Polar Terrestrial Environmental Systems @ AWI |
| url | https://doi.org/10.1594/PANGAEA.923843 |