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Rapid dynamic activation of a marine-based Arctic ice cap

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  • Malcolm McMillan
  • Andrew Shepherd
  • Noel Gourmelen
  • Amaury Dehecq
  • Amber Leeson
  • Andrew Ridout
  • Thomas Flament
  • Anna Hogg
  • Lin Gilbert
  • Toby Benham
  • Michiel Van Den Broeke
  • Julian A. Dowdeswell
  • Xavier Fettweis
  • Brice Noël
  • Tazio Strozzi
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<mark>Journal publication date</mark>27/01/2015
<mark>Journal</mark>Geophysical Research Letters
Issue number24
Volume41
Number of pages8
Pages (from-to)8902-8909
Publication StatusPublished
Early online date2/12/14
<mark>Original language</mark>English

Abstract

We use satellite observations to document rapid acceleration and ice loss from a formerly slow-flowing, marine-based sector of Austfonna, the largest ice cap in the Eurasian Arctic. During the past two decades, the sector ice discharge has increased 45-fold, the velocity regime has switched from predominantly slow (~ 101 m/yr) to fast (~ 103 m/yr) flow, and rates of ice thinning have exceeded 25 m/yr. At the time of widespread dynamic activation, parts of the terminus may have been near floatation. Subsequently, the imbalance has propagated 50 km inland to within 8 km of the ice cap summit. Our observations demonstrate the ability of slow-flowing ice to mobilize and quickly transmit the dynamic imbalance inland; a process that we show has initiated rapid ice loss to the ocean and redistribution of ice mass to locations more susceptible to melt, yet which remains poorly understood. Key Points Recent dynamic activation of a formerly slow-flowing marine Arctic ice capImbalance has spread 50 km inland to within 8 km of the ice cap summitIce discharge has increased 45-fold, and thinning rates have exceeded 25 m/yr

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