Fig. 1: Location map and context of the Thwaites Glacier study site.
From: Rapid retreat of Thwaites Glacier in the pre-satellite era
a, Map of the southern Amundsen Sea embayment in the vicinity of Thwaites Glacier. Bathymetry/topography covering marine, sub-ice shelf and grounded glacier from ref. 37. Previous grounding-line positions, as well as pinning points at the termini of the TGT and Eastern Ice Shelf, are shown in colour. Modern region of grounding hatched. T1-T3: tributary troughs. b, Long profile showing study site context. Pink bar and orange-shaded bathymetry show area of new survey. G.L., grounding line. c, AUV survey tracks at the apex of the Thwaites western ice mélange and TGT. d, AUV multibeam swath bathymetry of 1.5 m resolution superimposed on a hillshade-rendered image of shipborne EM122 swath bathymetry collected on the same research cruise. F, fan; C, crag; Ch, channel.
