Reference : Rapid dynamic activation of a marine-based Arctic ice cap
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
Rapid dynamic activation of a marine-based Arctic ice cap
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 []
Geophysical Research Letters
American Geophysical Union
Yes (verified by ORBi)
[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.

File(s) associated to this reference

Fulltext file(s):

Open access
McMillan_et_al-2014-Geophysical_Research_Letters.pdfPublisher postprint3.66 MBView/Open

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.