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Article Dans Une Revue Geophysical Research Letters Année : 2014

Rapid dynamic activation of a marine-based Arctic ice cap

Résumé

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.
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Dates et versions

hal-01102899 , version 1 (03-07-2024)

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Malcolm Mcmillan, Andrew Shepherd, Noel Gourmelen, Amaury Dehecq, Amber Leeson, et al.. Rapid dynamic activation of a marine-based Arctic ice cap. Geophysical Research Letters, 2014, pp.2014GL062255. ⟨10.1002/2014GL062255⟩. ⟨hal-01102899⟩
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