Extended Data Fig. 2: Tidal oscillations in mélange flow for two different time periods in the early record.
From: Granular decoherence precedes ice mélange failure and glacier calving at Jakobshavn Isbræ

(a) Tidal height measured ~5 km from the calving front and (b) Mélange 2D-derived speeds sampled along a centerline profile between Aug 1 19:02 and Aug 2 15:25. (c,d) same as (a,b) but for Aug 3 14:13 – Aug 5 9:43. Time ascends downward along the y-axis for all plots. The location of the profiles is shown in Extended Data Fig. 4.