摘要：Analyses of remote sensing data, surface observations and output from a regional
atmosphere model point to new records in 2010 for surface melt and albedo, runoff, the
number of days when bare ice is exposed and surface mass balance of the Greenland ice
sheet, especially over its west and southwest regions. Early melt onset in spring, triggered
by above-normal near-surface air temperatures, contributed to accelerated snowpack
metamorphism and premature bare ice exposure, rapidly reducing the surface albedo.
Warm conditions persisted through summer, with the positive albedo feedback
mechanism being a major contributor to large negative surface mass balance
anomalies. Summer snowfall was below average. This helped to maintain low
albedo through the 2010 melting season, which also lasted longer than usual.
