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.
This data publication provides all of the scripts and data necessary to
initialize and run the subglacial hydrology model and ice sheet model used
in this work (Manuscript number 2022GL098009). We also provide the model
output and the scripts used to create the figures in the manuscript and
the animations in the supplemental document. Several data sets are also
made available here, including integrated melt water runoff derived from
the regional climate model, MAR (Modèle Atmosphérique Régional), which is
used to force the hydrology model, and daily average effective pressure
derived from the hydrology model output, which is used to force the ice
sheet model. These files combined are sufficient to reproduce all results
and figures presented in this work.