Ice sheet–free West Antarctica during peak early Oligocene glaciation-Reference-Cited by-同舟云学术

Ice sheet–free West Antarctica during peak early Oligocene glaciation

Published:2024-07-19 Issue:6706 Volume:385 Page:322-327
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Klages J. P.¹^ORCID,Hillenbrand C.-D.²^ORCID,Bohaty S. M.³^ORCID,Salzmann U.⁴^ORCID,Bickert T.⁵^ORCID,Lohmann G.¹⁵⁶,Knahl H. S.¹^ORCID,Gierz P.¹^ORCID,Niu L.¹^ORCID,Titschack J.⁵⁷^ORCID,Kuhn G.¹⁸^ORCID,Frederichs T.⁵⁸^ORCID,Müller J.¹⁵⁸^ORCID,Bauersachs T.⁹^ORCID,Larter R. D.²^ORCID,Hochmuth K.¹⁰^ORCID,Ehrmann W.¹¹^ORCID,Nehrke G.¹^ORCID,Rodríguez-Tovar F. J.¹²^ORCID,Schmiedl G.¹³^ORCID,Spezzaferri S.¹⁴,Läufer A.¹⁵^ORCID,Lisker F.⁸^ORCID,van de Flierdt T.¹⁶^ORCID,Eisenhauer A.¹⁷^ORCID,Uenzelmann-Neben G.¹^ORCID,Esper O.¹^ORCID,Smith J. A.²,Pälike H.⁵⁸^ORCID,Spiegel C.⁸^ORCID,Dziadek R.¹^ORCID,Ronge T. A.¹⁸,Freudenthal T.⁵^ORCID,Gohl K.¹^ORCID

Affiliation:

1. Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany.

2. British Antarctic Survey, Cambridge, UK.

3. Institute of Earth Sciences, University of Heidelberg, Heidelberg, Germany.

4. Department of Geography and Environmental Sciences, Northumbria University, Newcastle upon Tyne, UK.

5. MARUM – Center for Marine Environmental Sciences, Bremen, Germany.

6. Environmental Physics, University of Bremen, Bremen, Germany.

7. Marine Research Department, Senckenberg am Meer (SAM), Wilhelmshaven, Germany.

8. Faculty of Geosciences, University of Bremen, Bremen, Germany.

9. Chair of Organic Biogeochemistry in Geo-Systems, RWTH Aachen University, Aachen, Germany.

10. Australian Centre for Excellence in Antarctic Science, Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia.

11. Institute for Geophysics and Geology, University of Leipzig, Leipzig, Germany.

12. Departamento de Estratigrafía y Paleontología, Universidad de Granada, Granada, Spain.

13. Center for Earth System Research and Sustainability, Institute for Geology, University of Hamburg, Hamburg, Germany.

14. Department of Geosciences, University of Fribourg, Fribourg, Switzerland.

15. Polar Geology, Bundesanstalt für Geowissenschaften und Rohstoffe, Hannover, Germany.

16. Department of Earth Science and Engineering, Imperial College London, London, UK.

17. GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel, Kiel, Germany.

18. International Ocean Discovery Program, Texas A&M University, College Station, TX, USA.

Abstract

One of Earth’s most fundamental climate shifts, the greenhouse-icehouse transition 34 million years ago, initiated Antarctic ice sheet buildup, influencing global climate until today. However, the extent of the ice sheet during the Early Oligocene Glacial Maximum (~33.7 to 33.2 million years ago) that immediately followed this transition—a critical knowledge gap for assessing feedbacks between permanently glaciated areas and early Cenozoic global climate reorganization—is uncertain. In this work, we present shallow-marine drilling data constraining earliest Oligocene environmental conditions on West Antarctica’s Pacific margin—a key region for understanding Antarctic ice sheet evolution. These data indicate a cool-temperate environment with mild ocean and air temperatures that prevented West Antarctic Ice Sheet formation. Climate–ice sheet modeling corroborates a highly asymmetric Antarctic ice sheet, thereby revealing its differential regional response to past and future climatic change.

Publisher

American Association for the Advancement of Science (AAAS)

Link

https://www.science.org/doi/pdf/10.1126/science.adj3931

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