Comparison of model results to basal tilt rates
This protocol is extracted from research article:
Sliding dominates slow-flowing margin regions, Greenland Ice Sheet
Sci Adv, Jul 10, 2019; DOI: 10.1126/sciadv.aaw5406

For each model scenario, synthetic tilt rates along theoretical inclinometer flow paths were compared to the observations (Fig. 3 and fig. S5). The theoretical flow paths were calculated using the modeled velocity field and the installation height above the bed as the starting location. In general, the flow path of the inclinometer mimics the basal topography below it, but with decreasing amplitude moving up through the ice column. Roughness of the bedrock topography means that different flow paths exist depending on whether the inclinometer is installed above a peak and trough of the bed roughness. However, we found very little difference between the theoretical inclinometer flow paths starting from either the trough or ridge given the same installation height.

Synthetic tilt rates were calculated along the flow paths from the gradients in the velocity field, yielding a synthetic record of inclinometer tilt rates versus basal distance to compare to the observations. It is conceivable that inclinometers could be located above or below their installation depth due to uncertainty associated with cable stretch or ice flow before the 2015–2016 winter. This uncertainty was taken into account when finding the boundary best fit to the observations by considering synthetic tilt rate records from flow paths starting at ±2 m the installation height. An example of modeled inclinometer tilt rates for each type of basal boundary is plotted in fig. S5. The observations were compared to both the synthetic tilt rate records and the spatial pattern of tilting. The best fit to the observations is plotted in Fig. 3.

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