Cartography · Studio

Figure 3

Three subplots, the two on the left cover the same extent, and the one on the right shows a smaller area contained within. The top left shows change in ice veloicty (green=faster, pink=slower). There is no pink, and the intensity of green increases towards the glacier. In the lower left the rate of surface elevation change is shown where red=thinning, blue=thickening; much of the glacier has thinned with the greatest thinning near the terminus. Two water bodies indicate some increases in elevation, however dh/dt values over water are not to be trusted. On the right, a close up satellite image of a glacier terminus with multiple terminus traces shown for a 6 year 2014-2020 period. Some terminus retreat is visible at the northern end of the glacier, near some grounded icebergs
Figure 3: Isortuarsuup Sermia: (a) change in average annual velocity between 2013–2021; (b) rate of surface elevation change (September 2012– June 2021) from ArcticDEM (negative denotes thinning); manually digitised ice margin shown in black in (a) and (b); (c) terminus positions 2014–2021. Red box in (a) denotes extent of (c). White arrows in (c) indicates the Little Ice Age trim-line and the black arrow points to the associated terminal moraine with icebergs grounded on its sublacustrine extension indicated by the orange arrow.
projectionNSIDC Sea Ice Polar Stereographic North. EPSG:3413
toolsPython libraries: geopandas, cartopy, xarray and matplotlib
dataIce Velocity data generated using auto-RIFT (Gardner et al., 2018) and provided by the NASA MEaSUREs ITS_LIVE; Surface elevation derived from Arctic DEM v4.1 (Porter et al., 2023); Background: Sentinel-2 acquisition from 19 September 2022 (ESA Copernicus, 2022)
commentsA clear thinning and acceleration signal is displayed, and the terminus retreating from the hypothesised sublacustrine moraine is reasonably clear.
date01/01/2024