Wednesday July 25, 2012
A large fracture is visible in a lake bed on the Greenland Ice Sheet after it drained the lake's entire liquid contents. Credit: Joughin/UW Polar Science Center. High resolution image
Featured on NASA.gov, a member of the U.S. Global Change Research Program
â€œFor several days this month, Greenland's surface ice cover melted over a larger area than at any time in more than 30 years of satellite observations. Nearly the entire ice cover of Greenland, from its thin, low-lying coastal edges to its 2-mile-thick center, experienced some degree of melting at its surface, according to measurements from three independent satellites analyzed by NASA and university scientists.
On average in the summer, about half of the surface of Greenland's ice sheet naturally melts. At high elevations, most of that melt water quickly refreezes in place. Near the coast, some of the melt water is retained by the ice sheet and the rest is lost to the ocean. But this year the extent of ice melting at or near the surface jumped dramatically. According to satellite data, an estimated 97 percent of the ice sheet surface thawed at some point in mid-July.â€ Read more