Fig. 2: Changes in ice geometry and structure above the Harder subglacial lake.
From: Outburst of a subglacial flood from the surface of the Greenland Ice Sheet
a, Repeat elevation profiles A–A′ (location shown in c) from sequences of co-registered ArcticDEM data (solid lines) and ICESat-2 data (dashed line) along ICESat-2 track 1130. b, Repeat elevation profiles B–B′ (location shown in c) along ICESat-2 track 1032, crossing both the lake and the edge of the downstream fracture site (entries marked by asterisks in the legend indicate data from ICESat-2). c, Surface elevation change between 9 July 2012 and 28 April 2015, from repeat ArcticDEM data. d, Sentinel-1 SAR backscatter image acquired after lake drainage (22 January 2015), showing evidence of fracturing of the ice surface. Data in a and b from https://data.pgc.umn.edu/elev/dem/setsm/ArcticDEM and https://nsidc.org, data in c from https://data.pgc.umn.edu/elev/dem/setsm/ArcticDEM, and data in d from https://browser.dataspace.copernicus.eu/.
