Ice sheet-free West Antarctica during peak early Oligocene glaciation.

Autor: Klages JP; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany., Hillenbrand CD; British Antarctic Survey, Cambridge, UK., Bohaty SM; Institute of Earth Sciences, University of Heidelberg, Heidelberg, Germany., Salzmann U; Department of Geography and Environmental Sciences, Northumbria University, Newcastle upon Tyne, UK., Bickert T; MARUM - Center for Marine Environmental Sciences, Bremen, Germany., Lohmann G; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany.; MARUM - Center for Marine Environmental Sciences, Bremen, Germany.; Environmental Physics, University of Bremen, Bremen, Germany., Knahl HS; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany., Gierz P; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany., Niu L; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany., Titschack J; MARUM - Center for Marine Environmental Sciences, Bremen, Germany.; Marine Research Department, Senckenberg am Meer (SAM), Wilhelmshaven, Germany., Kuhn G; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany.; Faculty of Geosciences, University of Bremen, Bremen, Germany., Frederichs T; MARUM - Center for Marine Environmental Sciences, Bremen, Germany.; Faculty of Geosciences, University of Bremen, Bremen, Germany., Müller J; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany.; MARUM - Center for Marine Environmental Sciences, Bremen, Germany.; Faculty of Geosciences, University of Bremen, Bremen, Germany., Bauersachs T; Chair of Organic Biogeochemistry in Geo-Systems, RWTH Aachen University, Aachen, Germany., Larter RD; British Antarctic Survey, Cambridge, UK., Hochmuth K; Australian Centre for Excellence in Antarctic Science, Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia., Ehrmann W; Institute for Geophysics and Geology, University of Leipzig, Leipzig, Germany., Nehrke G; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany., Rodríguez-Tovar FJ; Departamento de Estratigrafía y Paleontología, Universidad de Granada, Granada, Spain., Schmiedl G; Center for Earth System Research and Sustainability, Institute for Geology, University of Hamburg, Hamburg, Germany., Spezzaferri S; Department of Geosciences, University of Fribourg, Fribourg, Switzerland., Läufer A; Polar Geology, Bundesanstalt für Geowissenschaften und Rohstoffe, Hannover, Germany., Lisker F; Faculty of Geosciences, University of Bremen, Bremen, Germany., van de Flierdt T; Department of Earth Science and Engineering, Imperial College London, London, UK., Eisenhauer A; GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel, Kiel, Germany., Uenzelmann-Neben G; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany., Esper O; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany., Smith JA; British Antarctic Survey, Cambridge, UK., Pälike H; MARUM - Center for Marine Environmental Sciences, Bremen, Germany.; Faculty of Geosciences, University of Bremen, Bremen, Germany., Spiegel C; Faculty of Geosciences, University of Bremen, Bremen, Germany., Dziadek R; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany., Ronge TA; International Ocean Discovery Program, Texas A&M University, College Station, TX, USA., Freudenthal T; MARUM - Center for Marine Environmental Sciences, Bremen, Germany., Gohl K; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany.
Jazyk: angličtina
Zdroj: Science (New York, N.Y.) [Science] 2024 Jul 19; Vol. 385 (6706), pp. 322-327. Date of Electronic Publication: 2024 Jul 04.
DOI: 10.1126/science.adj3931
Abstrakt: 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.
Databáze: MEDLINE
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