Width-averaged terminus position of Helheim Glacier, 2002-2019

Terminus position of Helheim Glacier (2002-2019) in terms of a width-averaged distance [km] from an upstream flux gate.  Positions are identified from satellite imagery---primarily Moderate Imaging Spectroradiometer (MODIS) imagery, but incorporating Landsat and Sentinel-2 imagery when available. Terminus positions are derived manually until 2010 (Schild & Hamilton, 2013) and using a semi-automated technique thereafter (Foga, Stearns & van der Veen, 2014).