Geologically constrained 2-million-year-long simulations of Antarctic Ice Sheet retreat and expansion through the Pliocene.

Autor: Halberstadt ARW; Department of Earth and Planetary Sciences, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX, USA. arhalberstadt@utexas.edu., Gasson E; School of Geographical Sciences, University of Bristol, Bristol, UK., Pollard D; Earth and Environmental Systems Institute, Pennsylvania State University, University Park, PA, USA., Marschalek J; Department of Earth Science and Engineering, Imperial College London, London, UK., DeConto RM; Department of Geosciences, University of Massachusetts Amherst, Amherst, MA, USA.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2024 Aug 15; Vol. 15 (1), pp. 7014. Date of Electronic Publication: 2024 Aug 15.
DOI: 10.1038/s41467-024-51205-z
Abstrakt: Pliocene global temperatures periodically exceeded modern levels, offering insights into ice sheet sensitivity to warm climates. Ice-proximal geologic records from this period provide crucial but limited glimpses of Antarctic Ice Sheet behavior. We use an ice sheet model driven by climate model snapshots to simulate transient glacial cyclicity from 4.5 to 2.6 Ma, providing spatial and temporal context for geologic records. By evaluating model simulations against a comprehensive synthesis of geologic data, we translate the intermittent geologic record into a continuous reconstruction of Antarctic sea level contributions, revealing a dynamic ice sheet that contributed up to 25 m of glacial-interglacial sea level change. Model grounding line behavior across all major Antarctic catchments exhibits an extended period of receded ice during the mid-Pliocene, coincident with proximal geologic data around Antarctica but earlier than peak warmth in the Northern Hemisphere. Marine ice sheet collapse is triggered with 1.5 °C model subsurface ocean warming.
(© 2024. The Author(s).)
Databáze: MEDLINE
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