Greenland's ice sheet has started melting so early that scientists initially thought their models had broken when they saw the record-breaking measurements.
Melt in Greenland, over this wide an area, this early in the season, is not supposed to happen.
—Climate scientist Mike MacFarrin
"To say the 2016 Greenland melt season is off to the races is an understatement," reported Climate Central's Brian Kahn on Tuesday. "Warm, wet conditions rapidly kicked off the melt season this weekend, more than a month-and-a-half ahead of schedule."
The annual melting of Greenland's ice sheet officially starts when at least 10 percent of the ice sheet has melted. "The former top 3 earliest dates for a melt area larger than 10 percent were previously all in May," wrote Danish ice monitoring research outlet Polar Portal.
Aqqaluk Petersen "In Nuuk [Greenland] everything is melting" #earlymelt2016
— Jason Box (@climate_ice) April 12, 2016
In average years, the melt season in Greenland begins in late May or early June. On Tuesday, however, the temperature in a small village in southwest Greenland hit a record-setting high of 64.4°F, and "heavy rain also inundated local communities," Kahn reported. The high temperatures and rainy conditions are contributing to the ice sheet's melt.
"Melt in Greenland, over this wide an area, this early in the season, is not supposed to happen," wrote climate scientist Mike MacFarrin in a response posted on the Cooperative Institute for Research in Environmental Sciences (CIRES) website, detailing how the early melt may derail critical ice monitoring plans.
"Scientists at the [Danish Meteorological Institute (DMI)] were at first incredulous due to the early date," reported Polar Portal.
Indeed, the melt season's early onset is so unusual that scientists at first thought a technical malfunction was to blame. "We had to check that our models were still working properly," said Peter Langen, a climate scientist at DMI, to Polar Portal.
The measurements were accurate, however, and the record-breaking early melt season in Greenland will have adverse effects around the world.
As Kahn writes, "The Greenland ice sheet represents one of the most massive stores of ice on the planet. If it were all to melt, it would raise oceans about 20 feet. Melting ice is also affecting ocean circulation and even the drift of the North Pole."
"Despite the ice sheet's remote location, its slushy fingers reach across the globe, influencing sea levels and how fast the Gulf Stream current moves," observed Kahn last year, when the ice sheet melted unusually quickly under hot summer temperatures.
The melt season's start previously broke records in 2012, 2010, 2007, and 2002, noted MacFerrin, pointing to an obvious trend as the globe warms faster than most experts predicted.