Extended Data Fig. 4: The bathymetry near the GL of the TEIS along the T2 survey is characterized by ridged bedforms of varying wavelengths.
From: Heterogeneous melting near the Thwaites Glacier grounding line
a, Sonar-derived bathymetry from nearest the GL, coloured by depth, showing examples of linear ridges (after Fig. 2, bathymetry and profiles produced with Qimera and projected in QGIS). White lines denote the position of profiles found in c and d. b, Forward-looking sonar shows that the ice-shelf basal topography near the GL (after Fig. 2) is characterized by similar ridges, having an approximately 2.5 m ridge-crest spacing and sloped faces. Forward-looking sonar is projected in Oculus ViewPoint. c,d, Linear profiles of the bed topography across the region show evidence for ridges with approximately 1-m, 2–2.5-m and 5-m wavelengths. These data show that the shape of the ice surface at the GL is inherited from scraping over the bedforms and is later modified into terraces.
