Ice core record of surface meltwater runoff (black), with models based on observed temperatures for recent decades (red/orange/blue). Trusel et al/Nature
"The researchers write that “relatively stable and low runoff occurred before the 1990s.” Since then, the amount of melting has increased to about 33 percent above the 20th century average, and 50 percent above pre-Industrial-Revolution behavior. The ice-sheet-wide melting in 2012 stands out as the biggest event in the entire record."
