Mysteries surrounding disappearance of Greenland lakes water finally solved
The mysterious disappearance of Greenland glacial lakes has been finally elucidated. Scientists have been stunned by a phenomenon, at least strange at the first glance.
The ice lakes formed on the Greenland icecap were magically draining a speed that could rival probably the Niagara Falls.
Water flowing into a glacier moulin (Pic: China Crisis/Wikimedia)
The ice layers featured apparently some vertical wells, called “Moulin or glacier mills”, that were able to drain the water melted under various regions of a glacier.
The phenomenon causes cracks in the so-called supraglacial lakes able to drain the water in a few days, explained the scientists at the Massachusetts Institute of Technology – Woods Hole Oceanographic Institution (MIT/WHOI) Joint Program in Oceanography.
“We found that before water disappears from the lake, there is a six to 12 hours level rise,” explained Laura Stevens, the leader of the study.
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“The movement is sufficient enough to cause a tremendous pressure at the surface of the glacier to form cracks” added the geologist.
According to this study, the discovery might help experts forecast the changes of the global sea level.
Credit photo: I, China Crisis via Wikimedia Commons
Video: Greenland glaciers mapped in 3D from satellite