@article{van As_Fausto_Colgan_Box_PROMICE project team_2013, place={Copenhagen, Denmark}, title={Darkening of the Greenland ice sheet due to the melt albedo feedback observed at PROMICE weather stations}, volume={28}, url={https://geusbulletin.org/index.php/geusb/article/view/4728}, DOI={10.34194/geusb.v28.4728}, abstractNote={<p>The Greenland ice sheet is losing mass (Barletta <em>et al.</em> 2012) and at least half of this loss is caused by an increase in surface melt (e.g. Tedesco <em>et al.</em> 2013). The other part is caused by increased dynamic mass loss, as marine-terminating glaciers lose resistive stresses (Nick <em>et al.</em> 2009) due to both retreat and meltwater lubrication at the bed (Sasgen <em>et al.</em> 2012). In 2007, the Programme for Monitoring of the Greenland Ice Sheet (PROMICE) was initiated with the aim of gaining an insight into the causes of the ice-mass budget changes based on quantitative observations. This is primarily done by assessing how much mass is gained as snow accumulation on the surface versus how much is lost by calving and surface ablation (Ahlstrøm <em>et al.</em> 2008). PROMICE monitors the surface mass balance by means of automatic weather stations (AWSs) designed to quantify accumulation and ablation, as well as the specific energy sources contributing to ablation. These observations are vital to interpreting the physical mechanisms for ice-sheet response to climate change and for the calibration and validation of both satellite observations and climate models.</p>}, journal={GEUS Bulletin}, author={van As, Dirk and Fausto, Robert S. and Colgan, William T. and Box, Jason E. and PROMICE project team, *}, year={2013}, month={Jul.}, pages={69–72} }