Data for: Seasonal acceleration of Petermann Glacier, Greenland, from changes in subglacial hydrology

Petermann Glacier, a major outlet glacier of Northern Greenland, drains a marine-based basin vulnerable to destabilization. Using satellite radar interferometry data from the Sentinel-1a/b missions, we observe a seasonal glacier acceleration of 15% in the summer, from 1,250 m/yr to 1,500 m/yr near the grounding line, but the physical drivers of this seasonality have not been elucidated. Here, we use a subglacial hydrology model coupled one-way to an ice sheet model to evaluate the role of subglacial hydrology as a physical mechanism explaining the seasonality in speed. We model the basal effective pressure using the Glacier Drainage System model which then forces the Ice-sheet and Sea-level System Model. We find an excellent agreement between the observed and modeled velocity in terms of magnitude and timing, and conclude that seasonal changes in subglacial hydrology are sufficient to explain the observed seasonal speed up of Petermann Glacier.
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