Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 47, Issue 6, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2019GL085802
Keywords
glacier surge; ice dynamics; ice flow; North Greenland; remote sensing
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Funding
- European Space Agency, Ice Sheet CCI project (ESA) [40000112228/15/I-NB]
- ERC Synergy project ice2ice (ERC) from the European Union's Seventh Framework Programme [610055]
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We use remotely sensed ice velocities in combination with observations of surface elevation and glacier area change to investigate the dynamics of Hagen Br ae, North Greenland in high detail over the last 35 years. From our data, we can establish for the first time that Hagen Br ae is a surge-type glacier with characteristics of both Alaskan- and Svalbard-type surging glaciers. We argue that the observed surge was preconditioned by the glacier geometry and triggered by englacially stored meltwater. At present, the glacier is in a transitional state between active and quiescence phases and is not building up to its pre-surge geometry. We suggest that the glacier is adjusting to the loss of its floating section, general thinning, and changes in fjord conditions that occurred over the study period which are unrelated to the surge behavior. The high temporal resolution of the ice velocity data gives insight to the sub-annual glacier flow.
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