Sep 19, 2018

Massive destabilization of an Arctic ice cap

by
Michael J. Willis, Whyjay Zheng, William J. Durkin IV, Matthew E. Pritchard, Joan M. Ramage, Julian A. Dowdeswell, Toby J. Benham, Robin P. Bassford, Leigh A. Stearns, Andrey F. Glazovsky, Yuri Y. Macheret, Claire C. Porter
,
Earth and Planetary Science Letters
  • States that ice caps that are mostly frozen at the bedrock-ice interface are thought to be stable and respond slowly to changes in climate
  • Uses remote sensing to measure velocity and thickness changes that occur when the margin of the largely cold-based Vavilov Ice Cap in the Russian High Arctic advances over weak marine sediments
  • Shows that cold-based to polythermal glacier systems with no previous history of surging may evolve with unexpected and unprecedented speed when their basal boundary conditions change, resulting in very large dynamic ice mass losses (an increase in annual mass loss by a factor of ∼100) over a few years
  • Questions the future long-term stability of cold and polythermal polar ice caps, many of which terminate in marine waters as the climate becomes warmer and wetter in the polar regions