The Possible Transition From Glacial Surge to Ice Stream on Vavilov Ice Cap

Whyjay Zheng, Matthew E. Pritchard, Michael J. Willis, Leigh A. Stearns

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Surge-type glaciers typically undergo cyclical flow instability due to mass accumulation; however, some recent glacier surges have caused irreversible ice loss in a short period. At Vavilov Ice Cap, Russia, surge-like behavior initiated in 2013 and by spring 2019 the ice cap had lost 9.5 Gt of ice (11% mass of the entire basin). Using time series of surface elevation and glacier velocity derived from satellite optical and synthetic-aperture radar imagery, we identify a shift of flow pattern starting in 2017 when shear margins formed within the grounded marine piedmont fan. Multiple summer speedups correlate with warmer summers during 2015–2019 and suggest that surface melt may access the subglacial environment. Force balance analysis and examination of the Péclet number show that glacier thinning propagated upstream in 2016–2017, and diffusion became a significant dynamic response to thinning perturbations. Our results suggest that the glacier has entered a new ice stream-like regime.

Original languageEnglish
Pages (from-to)13892-13902
Number of pages11
JournalGeophysical Research Letters
Volume46
Issue number23
DOIs
StatePublished - 16 Dec 2019

Keywords

  • Peclet number
  • Vavilov Ice Cap
  • glacial surge
  • ice stream
  • shear margins
  • summer speedup

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