Rain fell at the highest point on the Greenland ice sheet last week for the first time on record, another worrying sign that the ice sheet is melting at an increasing rate
"That's not a healthy sign for an ice sheet," said Indrani Das, a glaciologist with Columbia University's Lamont-Doherty Earth Observatory. "Water on ice is bad. … It makes the ice sheet more prone to surface melt."
Temperatures at the ice cap almost never lift above freezing, but have now done so three times in less than a decade. Greenland experienced a massive melting event in late July, when enough ice melted in a single day to cover the U.S. state of Florida in 2 inches of water.That melting event and last week's rain were both caused by air circulation patterns which meant warm, moist air temporarily covered the island.
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