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Past continental shelf evolution increased Antarctic ice sheet sensitivity to climatic conditions

Research output: Contribution to journalArticle

  • Florence Colleoni
  • Laura De Santis
  • Enea Montoli
  • Elisabetta Olivo
  • Christopher C. Sorlien
  • Philip J. Bart
  • Edward G.W. Gasson
  • Andrea Bergamasco
  • Chiara Sauli
  • Nigel Wardell
  • Stefano Prato
Original languageEnglish
Article number11323
Number of pages12
JournalScientific Reports
Volume8
DOIs
DateAccepted/In press - 12 Jul 2018
DatePublished (current) - 27 Jul 2018

Abstract

Over the past 34 Million years, the Antarctic continental shelf has gradually deepened due to ice sheet loading, thermal subsidence, and erosion from repeated glaciations. The deepening that is recorded in the sedimentary deposits around the Antarctic margin indicates that after the mid-Miocene Climate Optimum (≈15 Ma), Antarctic Ice Sheet (AIS) dynamical response to climate conditions changed. We explore end-members for maximum AIS extent, based on ice-sheet simulations of a late-Pleistocene and a mid-Miocene glaciation. Fundamental dynamical differences emerge as a consequence of atmospheric forcing, eustatic sea level and continental shelf evolution. We show that the AIS contributed to the amplification of its own sensitivity to ocean forcing by gradually expanding and eroding the continental shelf, that probably changed its tipping points through time. The lack of past topographic and bathymetric reconstructions implies that so far, we still have an incomplete understanding of AIS fast response to past warm climate conditions, which is crucial to constrain its future evolution.

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    Rights statement: This is the final published version of the article (version of record). It first appeared online via Nature at https://doi.org/10.1038/s41598-018-29718-7 . Please refer to any applicable terms of use of the publisher.

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    Licence: CC BY

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