Greenland is about three-times the size of Texas and almost completely covered in ice. Last week, 12 billion tonnes of ice melted and ran-off the ice sheet in one day. The National Snow and Ice Data Center estimated that between July 30 and August 3, runoff from ice melt was about 55 billion tonnes. This is 40 billion tonnes more than the historic average. At this rate, ice runoff could match or surpass what was seen in 2012, when runoff reached a 350-year high.
To put this in perspective, we’ve compiled five facts on Greenland’s ice sheet from data on Resource Watch and recent peer-reviewed research:
The ice melt season started early this year. Images from satellites found that the ice arch that goes between Greenland and Ellesmere Island broke-up in March this year, months ahead of schedule. According to NASA, the arch acts a gatekeeper, preventing sea ice from exiting the Arctic Ocean and drifting southward into Baffin Bay.
Scientists recently found that methane is being released from below the Greenland ice sheet — from inorganic and ancient organic carbon buried beneath the ice — during the melt season. This source of methane emissions is not properly accounted for in global carbon budgets, according to the researchers, and the gas is 28 times more powerful than carbon dioxide.
Melting ice on land from glaciers or ice sheets is one of the two major forces driving sea level rise. (The other is thermal expansion, because water expands as it gets warmer.) Researchers estimate that melting land ice in the Arctic accounted for 35% of sea level rise in recent years.