High temporal resolution measurements of surface velocity and vertical strain rate indicated systematic diurnal flow variations in a temperate valley glacier. These data are consistent with a cause related to spatially and temporally non-uniform basal motion.

These surface flow fluctuations are not simply the results of variations in local basal motion, but also of variations in neighbouring basal and englacial motion, as shown in Fig. 68.3. Thus, the spatial distribution of basal motion and its transfer to the englacial flow field control short-term flow variations in temperate glaciers. High-frequency measurements of the englacial flow field are crucial to improve our understanding in this research field and accurate computation of the glacier flow field is important to infer bed conditions and basal-flow processes from surface observations.

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