![]() ![]() We estimate a ∼ 1 km wide floating zone near the calving front in early summer of 20, where ice moves in phase with ocean tides. Ice velocity variations near the terminus of Jakobshavn Isbræ, Greenland, were observed with a terrestrial radar interferometer (TRI) during three summer campaigns in 2012, 2015, and 2016. We hypothesize that these additional diurnal variations are associated with peaks in lubrication of the glacier bed due to surface melting The speed variations reach their daily maximum value ∼6 hours after local noon. With a mean flow rate at this location of ∼22 m d–1. These non-tidal variations account for a peak-to-peak variation in glacier flow speed at a site close to the terminus of ∼0.7 m d–1, compared We findĪn additional signal in glacier position, in phase with the S1 solar tide, with some modulations at other frequencies. However, diurnal variations in the glacier flow cannot be simply described using this model. We find that the semidiurnal constituents of the glacier flow are well modeled using a single admittance and lag with respect to the tide-gauge data. ![]() ![]() For both the tidegauge and GPS time series, we calculated amplitudes and phases for a harmonic expansion usingĪ limited set of harmonic constituents. We have used tide-gauge data from near Helheim Glacier, East Greenland, and GPS data acquired on the glacier to investigate the spectra of tidal forcing and flow response. ![]()
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