Massive Antarctic Lake Disappears in Just a Few Days

Home Technology Massive Antarctic Lake Disappears in Just a Few Days
Massive Antarctic Lake Disappears in Just a Few Days
Satellite imagery shows before and after an Antarctic lake disappeared.
Gif: Australia Antarctic Program Partnership

A huge lake on the east coast of Antarctica has disappeared, causing 200 billion gallons of water to vanish without a trace.

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In the winter of 2019 on the Amery Ice Shelf, the third-largest ice shelf on the continent, around 21 billion to 26 billion cubic feet (600 million to 750 million cubic meters) drained really quickly into the ocean. The lake’s disappearing act was noticed the following summer when scientists were looking at satellite photos of the region. The findings are chronicled in a new study.

“We believe a large crack opened briefly in the floating ice shelf and drained the entire lake into the ocean within three days,” Roland Warner, a scientist at the Australian Antarctic Program Partnership at the University of Tasmania who first spotted the major drainage on satellite imagery, said in a release. “The lake held more water than Sydney Harbor and the flow into the ocean beneath would have been like the flow over Niagara Falls, so it would have been an impressive sight.”

In the paper published last week in Geophysical Research Letters, Warner and his coauthors found that the sudden drainage may have been caused by meltwater in the ice. They theorize that there was meltwater stored underneath the deep, ice-covered lake, which put pressure on the ice shelf and caused a crack to open that sent the water right to the ocean, in a process known as hydrofracturing. The drained lake left a huge depression in the ice—around 4.24 square miles (11 square kilometers)—which quickly began to fill with meltwater again last summer.