Reference : Rapid dynamic activation of a marine-based Arctic ice cap
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/2268/178243
Rapid dynamic activation of a marine-based Arctic ice cap
English
McMillan, M []
Shepherd, A []
Gourmelen, N []
Dehecq, A []
Leeson, A []
Ridout, A []
Flament, T []
Hogg, A []
Gilbert, L []
Benham, T []
van den Broeke, M []
Dowdeswell, J []
Fettweis, Xavier mailto [Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie >]
Noël, B []
Strozzi, T []
23-Dec-2014
Geophysical Research Letters
American Geophysical Union
41
24
8902–8909
Yes (verified by ORBi)
International
0094-8276
1944-8007
Washington
DC
[en] mass balance ; Austfonna ; dynamic instability
[en] 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.
Researchers
http://hdl.handle.net/2268/178243
10.1002/2014GL062255
http://onlinelibrary.wiley.com/doi/10.1002/2014GL062255/abstract

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