Persistent flow acceleration within the interior of the Greenland Ice Sheet

Samuel Huckerby Doyle, Alun Lloyd Hubbard, Andrew Alexander William Fitzpatrick, Dirk Van As, Andreas Mikkelsen, Rickard Pettersson, Bryn Pugh Hubbard

Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

76 Dyfyniadau (Scopus)
202 Wedi eu Llwytho i Lawr (Pure)

Crynodeb

We present surface velocity measurements from a high-elevation site located 140 km from the western margin of the Greenland ice sheet, and ~ 50 km into its accumulation area. Annual velocity increased each year from 51.78 ± 0.01 m yr−1 in 2009 to 52.92 ± 0.01 m yr−1 in 2012—a net increase of 2.2%. These data also reveal a strong seasonal velocity cycle of up to 8.1% above the winter mean, driven by seasonal melt and supraglacial lake drainage. Sole et al. (2013) recently argued that ice motion in the ablation area is mediated by reduced winter flow following the development of efficient subglacial drainage during warmer, faster, summers. Our data extend this analysis and reveal a year-on-year increase in annual velocity above the equilibrium line altitude, where despite surface melt increasing, it is still sufficiently low to hinder the development of efficient drainage under thick ice.
Iaith wreiddiolSaesneg
Tudalennau (o-i)899-905
Nifer y tudalennau7
CyfnodolynGeophysical Research Letters
Cyfrol41
Rhif cyhoeddi3
Dyddiad ar-lein cynnar14 Chwef 2014
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - 10 Maw 2014

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