When you buy through links on our land site , we may earn an affiliate committal . Here ’s how it work .
The lake that form atop Greenland ’s Ice Sheet , called supraglacial lakes , can rapidly , and enigmatically , drain billions of gallons of water in a matter of minute . Geoscientists have now envision out a primal part of the puzzle to explain how this go away act occurs . They published their results today ( June 3 ) in the journal Nature . [ Read the full story on Greenland ’s supraglacial lakes ]
Here one day …
In 2006 , North Lake in Greenland , a supraglacial lake , drained virtually 12 billion gallons of its meltwater in less than two hours . Scientists later witness that giant piddle - induced cranny called hydro - fractures can form just beneath the lake basin , stretching down to the bed of the ice sheet . Those cracks can empty the superimposed lake of its urine . Here , a moulin ( vertical conduits or slam in a glacier ) formed along the hydro - faulting through Greenland ’s North Lake basin stay to run out meltwater to the bed after the 2013 North Lake speedy drainage . ( Photo Credit : Ian Joughin )
frosty mystery
Scientists were n’t sure just how these fractures developed — until now . In the new study , scientists used 16 GPS stations localise around North Lake to figure out specific movement below the lake . They found that tension - related stress triggered by movements of the frappe sheet ( actuate by the trickling meltwater ) could create these hydro - fractures . The rapid drainage of North Lake in 2011 left behind a hydro - fault scarp and exposed lakebed ( shown here ) . ( Photo Credit : Ian Joughin )
On the move
The unexampled finding also paints a clear image of the meltwater that travels down to the bed of the Greenland Ice Sheet , help scientist to figure out how fast that sheet flows during the summer calendar month , the researchers said . Here , a supraglacial lake on the western margin of the Greenland Ice Sheet . ( Photo Credit : Laura A. Stevens )
summertime melt
Supraglacial lakes , like this one on the westerly tolerance of the Greenland Ice Sheet , kind atop the ice sheet during the summertime " melt " months . ( Photo Credit : Laura A. Stevens )
Disappearing acts
A supraglacial lake and helicopter on the westerly margin of the Greenland Ice Sheet . Most of these lake drain slow as current pop up and send that water into lasting crevasse . However , late enquiry using satellite prototype has paint a picture 13 percent of lake " disappear " within 24 hours , entirely draining . ( Photo Credit : Laura A. Stevens )
Hydrologic line
Here , a supraglacial lake on the Greenland Ice Sheet in the Kangerlussuaq orbit . Photographed on July 21 , 2012 , the lake feast a stream that delivers meltwater to the modest elevations where it either flows to the sea on the surface or dives into the frappe to impart to a hydrological pipeline of sorts . ( Photo Credit : Marco Tedesco )
