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Melt lakes: Scientists detect sudden large Antarctic water mass drains empty


Hydro-fracture occurs when liquid water, denser than ice, exerts sufficient extra pressure on cracks in ice shelves to open them right through to the ocean below.
Scientists in Australia and the United States are reporting the sudden loss of a large ice-covered Antarctic lake covering an area of eleven square kilometres. The rare event occurred during the winter of 2019 on Amery Ice Shelf in East Antarctica and was noticed in satellite images the following summer by Dr Roland Warner from the Australian Antarctic Program Partnership at the University of Tasmania.
Dr Warner said that the event, detailed in a paper just published in Geophysical Research Letters, was most likely caused by a process known as ‘hydro-fracturing’. ....

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How a lake on an Antarctic ice shelf disappeared in three days


 
TORONTO
In 2019, a lake on an ice sheet in East Antarctica vanished completely over the course of three days.
The strange occurrence went unnoticed until the next summer, when Dr. Roland Warner, a glaciologist with the Australian Antarctic Program Partnership at the University of Tasmania, noticed discrepancies in satellite images of the Amery Ice Shelf.
As he investigated further, he and other researchers concluded that something rare had happened: a hydrofracture.
“We believe a large crack opened briefly in the floating ice shelf and drained the entire lake into the ocean within three days,” Warner said in a news release. ....

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