Projects per year
Abstract
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.
Original language | English |
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Pages (from-to) | 899-905 |
Number of pages | 7 |
Journal | Geophysical Research Letters |
Volume | 41 |
Issue number | 3 |
Early online date | 14 Feb 2014 |
DOIs | |
Publication status | Published - 10 Mar 2014 |
Keywords
- Greenland Ice Sheet
- Global Positioning System
- Acceleration
- Ice sheet dynamics
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Dive into the research topics of 'Persistent flow acceleration within the interior of the Greenland Ice Sheet'. Together they form a unique fingerprint.Profiles
Projects
- 4 Finished
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SAFIRE: Subglacial Access and Fast Ice Research Experiment (SAFIRE)
Christoffersen, P., Hubbard, B. & Hubbard, A.
Natural Environment Research Council
29 Nov 2013 → 28 Nov 2016
Project: Externally funded research
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Investigating Meltwater Flow Beneath the Greenland Ice Sheet using a Multi-tracer Approach
Hubbard, A.
Natural Environment Research Council
01 May 2011 → 30 Apr 2015
Project: Externally funded research
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A Holistic Model of Outlet Calving, Dynamic Acceloration and Drawdown for the Greenland Ice Sheet
Hubbard, A.
Natural Environment Research Council
01 Jun 2009 → 31 May 2011
Project: Externally funded research
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Dynamic Response of the Greenland Ice Sheet to Climate Forcing using a geophysical, Remote sensing and Numerical Modelling Framework
Hubbard, A.
Natural Environment Research Council
01 Mar 2009 → 31 Jan 2013
Project: Externally funded research