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West Antarctic ice retreat and paleoceanography in the Amundsen Sea in the warm early Pliocene

Mass loss from polar ice sheets is poorly constrained in estimates of future global sea-level rise. Today, the marine-based West Antarctic Ice Sheet is losing mass at an accelerating rate, most notably in the Thwaites and Pine Island glacier drainage basins. Early Pliocene surface temperatures were...

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Hauptverfasser: Passchier, Sandra (VerfasserIn) , Hillenbrand, Claus-Dieter (VerfasserIn) , Hemming, Sidney (VerfasserIn) , Ehrmann, Werner (VerfasserIn) , Frederichs, Thomas (VerfasserIn) , Bohaty, Steven M. (VerfasserIn) , Leon, Ronald (VerfasserIn) , Libman-Roshal, Olga (VerfasserIn) , Mino-Moreira, Lisbeth (VerfasserIn) , Gohl, Karsten (VerfasserIn) , Wellner, Julia (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 01 July 2025
In: Nature Communications
Year: 2025, Jahrgang: 16, Pages: 1-18
ISSN:2041-1723
DOI:10.1038/s41467-025-60772-8
Online-Zugang:Verlag, kostenfrei, Volltext: https://doi.org/10.1038/s41467-025-60772-8
Verlag, kostenfrei, Volltext: https://www.nature.com/articles/s41467-025-60772-8
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Verfasserangaben:Sandra Passchier, Claus-Dieter Hillenbrand, Sidney Hemming, Werner Ehrmann, Thomas Frederichs, Steve M. Bohaty, Ronald Leon, Olga Libman-Roshal, Lisbeth Mino-Moreira, Karsten Gohl & Julia Wellner
Beschreibung
Zusammenfassung:Mass loss from polar ice sheets is poorly constrained in estimates of future global sea-level rise. Today, the marine-based West Antarctic Ice Sheet is losing mass at an accelerating rate, most notably in the Thwaites and Pine Island glacier drainage basins. Early Pliocene surface temperatures were about 4 °C warmer than preindustrial and maximum sea level stood ~20 m above present. Using data from a sediment archive on the Amundsen Sea continental rise, we investigate the impact of prolonged Pliocene ocean warmth on the ice-sheet−ocean system. We show that, in contrast to today, during peak ocean warming ~4.6 − 4.5 Ma, terrigenous muds accumulated rapidly under a weak bottom current regime after spill-over of dense shelf water with high suspended load down to the rise. From sediment provenance data we infer major retreat of the Thwaites Glacier system at ~4.4 Ma several hundreds of km inland from its present grounding line position, highlighting the potential for major Earth System changes under prolonged future warming.
Beschreibung:Gesehen am 28.11.2025
Beschreibung:Online Resource
ISSN:2041-1723
DOI:10.1038/s41467-025-60772-8

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