The Greenland melt detection algorithm is currently undergoing its annual calibration period. As a result, the daily melt extent mapping image is temporarily suspended. Calibration of the melt detection for each year requires analysis of the springtime snow conditions by a separate program. See our March 13, 2013 post for more discussion of melt calibration.
We will resume the daily image updates in April. A consistent record will be produced later that spans these winter periods retrospectively.
UPDATE, April 30, 2014: We are working to resume image updates by early May. Thank you for your patience.