Geophysical constraints on the dynamics and retreat of the Barents Sea ice sheet as a paleobenchmark for models of marine ice sheet deglaciation

Henry Patton*, Karin Andreassen, Lilja R. Bjarnadóttir, Julian A. Dowdeswell, Monica C. M. Winsborrow, Riko Noormets, Leonid Polyak, Amandine Auriac, Alun Hubbard

*Corresponding author for this work

Research output: Contribution to journalReview Articlepeer-review

66 Citations (Scopus)

Abstract

Our understanding of processes relating to the retreat of marine-based ice sheets, such as the West Antarctic Ice Sheet and tidewater-terminating glaciers in Greenland today, is still limited. In particular, the role of ice stream instabilities and oceanographic dynamics in driving their collapse are poorly constrained beyond observational timescales. Over numerous glaciations during the Quaternary, a marine-based ice sheet has waxed and waned over the Barents Sea continental shelf, characterized by a number of ice streams that extended to the shelf edge and subsequently collapsed during periods of climate and ocean warming. Increasing availability of offshore and onshore geophysical data over the last decade has significantly enhanced our knowledge of the pattern and timing of retreat of this Barents Sea ice sheet (BSIS), particularly so from its Late Weichselian maximum extent. We present a review of existing geophysical constraints that detail the dynamic evolution of the BSIS through the last glacial cycle, providing numerical modelers and geophysical workers with a benchmark data set with which to tune ice sheet reconstructions and explore ice sheet sensitivities and drivers of dynamic behavior. Although constraining data are generally spatially sporadic across the Barents and Kara Seas, behaviors such as ice sheet thinning, major ice divide migration, asynchronous and rapid flow switching, and ice stream collapses are all evident. Further investigation into the drivers and mechanisms of such dynamics within this unique paleo-analogue is seen as a key priority for advancing our understanding of marine-based ice sheet deglaciations, both in the deep past and in the short-term future.

Original languageEnglish
Pages (from-to)1051-1098
Number of pages48
JournalReviews of Geophysics
Volume53
Issue number4
Early online date14 Nov 2015
DOIs
Publication statusPublished - 01 Dec 2015

Keywords

  • Barents Sea ice sheet
  • deglaciation
  • ice sheet dynamics
  • ice sheet modeling
  • marine ice sheet
  • Svalbard

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