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Ice sheet-free West Antarctica during peak early Oligocene glaciation.
Klages, J P; Hillenbrand, C-D; Bohaty, S M; Salzmann, U; Bickert, T; Lohmann, G; Knahl, H S; Gierz, P; Niu, L; Titschack, J; Kuhn, G; Frederichs, T; Müller, J; Bauersachs, T; Larter, R D; Hochmuth, K; Ehrmann, W; Nehrke, G; Rodríguez-Tovar, F J; Schmiedl, G; Spezzaferri, S; Läufer, A; Lisker, F; van de Flierdt, T; Eisenhauer, A; Uenzelmann-Neben, G; Esper, O; Smith, J A; Pälike, H; Spiegel, C; Dziadek, R; Ronge, T A; Freudenthal, T; Gohl, K.
Affiliation
  • 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.
  • Knahl HS; MARUM - Center for Marine Environmental Sciences, Bremen, Germany.
  • Gierz P; Environmental Physics, University of Bremen, Bremen, Germany.
  • Niu L; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany.
  • Titschack J; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany.
  • Kuhn G; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany.
  • Frederichs T; MARUM - Center for Marine Environmental Sciences, Bremen, Germany.
  • Müller J; Marine Research Department, Senckenberg am Meer (SAM), Wilhelmshaven, Germany.
  • Bauersachs T; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany.
  • Larter RD; Faculty of Geosciences, University of Bremen, Bremen, Germany.
  • Hochmuth K; MARUM - Center for Marine Environmental Sciences, Bremen, Germany.
  • Ehrmann W; Faculty of Geosciences, University of Bremen, Bremen, Germany.
  • Nehrke G; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany.
  • Rodríguez-Tovar FJ; MARUM - Center for Marine Environmental Sciences, Bremen, Germany.
  • Schmiedl G; Faculty of Geosciences, University of Bremen, Bremen, Germany.
  • Spezzaferri S; Chair of Organic Biogeochemistry in Geo-Systems, RWTH Aachen University, Aachen, Germany.
  • Läufer A; British Antarctic Survey, Cambridge, UK.
  • Lisker F; Australian Centre for Excellence in Antarctic Science, Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia.
  • van de Flierdt T; Institute for Geophysics and Geology, University of Leipzig, Leipzig, Germany.
  • Eisenhauer A; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany.
  • Uenzelmann-Neben G; Departamento de Estratigrafía y Paleontología, Universidad de Granada, Granada, Spain.
  • Esper O; Center for Earth System Research and Sustainability, Institute for Geology, University of Hamburg, Hamburg, Germany.
  • Smith JA; Department of Geosciences, University of Fribourg, Fribourg, Switzerland.
  • Pälike H; Polar Geology, Bundesanstalt für Geowissenschaften und Rohstoffe, Hannover, Germany.
  • Spiegel C; Faculty of Geosciences, University of Bremen, Bremen, Germany.
  • Dziadek R; Department of Earth Science and Engineering, Imperial College London, London, UK.
  • Ronge TA; GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel, Kiel, Germany.
  • Freudenthal T; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany.
  • Gohl K; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany.
Science ; 385(6706): 322-327, 2024 Jul 19.
Article in En | MEDLINE | ID: mdl-38963876
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.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Science Year: 2024 Document type: Article Affiliation country:
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Science Year: 2024 Document type: Article Affiliation country: