Large obliquity-paced Antarctic ice-volume fluctuations suggest melting by atmospheric and ocean warming during late Oligocene
The late Oligocene (~27.8-23 My ago) offers an opportunity to study past climate variability under high-CO2, warmer-than-present and the unipolar (Antarctic) glaciated state. Here, we present new high-resolution geochemical records from exquisitely well-preserved benthic foraminifera for the late Ol...
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| Hauptverfasser: | , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2023
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| In: |
Communications earth & environment
Year: 2023, Jahrgang: 4, Pages: 1-8 |
| ISSN: | 2662-4435 |
| DOI: | 10.1038/s43247-023-00864-9 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.1038/s43247-023-00864-9 Verlag, kostenfrei, Volltext: https://www.nature.com/articles/s43247-023-00864-9 
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| Verfasserangaben: | Swaantje Brzelinski, André Bornemann, Diederik Liebrand, Tim E. van Peer, Paul A. Wilson & Oliver Friedrich |
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| 245 | 1 | 0 | |a Large obliquity-paced Antarctic ice-volume fluctuations suggest melting by atmospheric and ocean warming during late Oligocene |c Swaantje Brzelinski, André Bornemann, Diederik Liebrand, Tim E. van Peer, Paul A. Wilson & Oliver Friedrich |
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| 520 | |a The late Oligocene (~27.8-23 My ago) offers an opportunity to study past climate variability under high-CO2, warmer-than-present and the unipolar (Antarctic) glaciated state. Here, we present new high-resolution geochemical records from exquisitely well-preserved benthic foraminifera for the late Oligocene, an interval for which Antarctic ice-sheet size and stability are debated. Our records indicate four obliquity-paced glacial-interglacial cycles with ice-volume changes of up to ~70% of the modern Antarctic ice-sheet. The amplitude of ice-volume change during these late Oligocene glacial-interglacial cycles is comparable to that of the late Pliocene and early Pleistocene. Ice-volume estimates for interglacials are small enough to be accommodated by a land-based Antarctic ice-sheet but, for three of the four glacials studied, our calculations imply that ice sheets likely advanced beyond the Antarctic coastline onto the shelves. Our findings suggest an Antarctic ice-sheet vulnerable to melting driven by both bottom-up (ocean) and top-down (atmospheric) warming under late Oligocene warmer-than-present climate conditions. | ||
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