Jeff Masters has details on the record temperatures in Greenland last year.
This map from NOAA shows the departure from average (since 1920) of the temperature of the waters near Greenland. Many areas were over 5 degrees F over normal, “a truly remarkable anomaly, surpassing the previous record of 1.5°C set in 2003.”
One consequence was that, for a large part of Greenland, the summer melt season was 40 days (and nights) longer than average.
The major concern with a warming climate in Greenland is melting of the Greenland ice sheet, which currently contributes about 25% of the observed 3 mm/year (1.5 inches per decade) global rise in sea level. Higher sea levels mean increased storm surge inundation, coastal erosion, loss of low-lying land areas, and salt water contamination of underground drinking water supplies. Greenland ice mass loss is accelerating over the long term, according to independent estimates using three different techniques (Figure 5), with more mass being lost each year than the previous year.
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Image credit: NOAA Visualization Lab