This video taken during a 23 August 2014 maintenance tour of http://www.promice.org climate stations on the southern Greenland ice sheet.
Higher on the ice sheet, the surface is not this dark. But down low, where the highest melt rates happen, this darkness amplifies absorbed sunlight, the dominant energy source for melt.
Dark Snow Project
Scientist, Jason Box investigates How Carbon Black Aerosols Melt Greenland Ice