How US Heat Waves Melted Greenland's Ice

Greenland's two record-shattering surface melts, though more than a century apart, were both triggered by U.S. heat waves.

April 28, 2014
6:45 PM EDT
Atmospheric river events on July 5,1889, and July 9, 2012, swept warm, moist air up toward Greenland's west coast, contributing to extreme melt that year. | Don Murray, CIRES/NOAA