Greenland Ice Sheet Today

Photograph of a large melt pond on the Greenland Ice Sheet

A large melt pond on the Greenland Ice Sheet, photographed in 2004. Although melt ponds are normal phenomena during the summer melt season, scientists are paying closer attention to their frequency, extent, and duration. Courtesy John Maurer.

As warming alters the Arctic landscape, people are paying more attention to the changes happening to the Greenland Ice Sheet. The ice is melting more rapidly than before, leaving us to wonder, what’s going on?

To help answer your questions about Greenland, NSIDC’s newest Web site, Greenland Ice Sheet Today, will feature the latest research and imagery that researchers are using to monitor the ice. Scientists are discovering that while the ice sheet is in no danger of instantly melting, it is not immune to the Arctic’s rising temperatures. Continue reading

What caused last summer’s Greenland surface melt?

Data image showing extreme Greenland surface melt in summer 2012

These satellite-derived maps show the extent of surface melt over Greenland’s ice sheet during the summer of 2012. On July 8, about 40 percent of the ice sheet had melted at or near the surface. By July 12, nearly 97 percent of the ice sheet surface had melted. High pressure ridges that persisted over Greenland created a lingering heat dome that caused the extensive melt. Credit: Nicolo E. DiGirolamo, SSAI/NASA GSFC, and Jesse Allen, NASA Earth Observatory

During the summer of 2012, scientists noticed something unusual in Greenland. On July 8, about 40 percent of the Greenland Ice Sheet surface showed signs of melting. But a mere four days later, 97 percent of the surface was melting, an extent that was unprecedented in the satellite record.

Just how unprecedented was this event? Does it mean that the Greenland Ice Sheet is possibly on the way out, like summer sea ice in the Arctic? Continue reading

Greenland’s glaciers and the Arctic climate

These before-and-after photographs show Petermann Glacier in July 2009, before the calving event, and again in July 2011. Photographs courtesy Jason Box (top), Alan Hubbard (bottom)

Last summer, a chunk of ice three times the size of Manhattan broke off Petermann Glacier in Greenland and floated out to sea. The calving left miles of newly open water in the deep Petermann Fjord, which had been capped in a thick layer of glacial ice. New research out this summer confirmed that it was likely the largest calving in the region since observations began in 1876. What does this event tell us about climate change in the Arctic? Continue reading