Greenland isn't just losing Manhattan-sized chunks of ice from its huge glaciers. A heat-dome that moved over Greenland on July 8 caused surface melt to soar from 40% to an unprecedented 97% in just four days, reports Live Science. Typically, just half of Greenland's surface ice melts during the summer. "This was so extraordinary that at first I questioned the result: Was this real or was it due to a data error?" said one researcher.
There were even signs of ice melt at Summit Station in central Greenland, a point two miles high and near the thickest part of the ice sheet. "Ice cores from Summit show that melting events of this type occur about once every 150 years on average," said one glaciologist. "With the last one happening in 1889, this event is right on time." However, she cautioned that such a wide-ranging melt was rare and a potential warning. "If we continue to observe melting events like this in upcoming years, it will be worrisome," she told the Guardian.