Satellites present how a large lake in Antarctica vanished in days

On June 5, 2019, a large, ice-covered lake sat atop East Antarctica’s Amery Ice Shelf. Inside six days, all 600 million to 750 million cubic meters of lake water had vanished, leaving a deep sinkhole crammed with fractured ice.

“The quantity of water that was within the lake was twice that of San Diego Bay. We’re speaking about a number of water,” says Helen Fricker, a glaciologist at Scripps Establishment of Oceanography in La Jolla, Calif. Now, utilizing satellite tv for pc knowledge to reconstruct the occasion, scientists have solved the thriller of the disappearing lake.

Almost certainly, the load of all that water fractured the ice shelf under. Channels within the ice then fashioned, and the water drained away suddenly, in a Niagara Falls–like rush, glaciologist Roland Warner, Fricker and colleagues report June 23 in Geophysical Analysis Letters.

Earlier than they knew concerning the lake, the scientists first noticed the sinkhole. “It was serendipitous,” Fricker says. Warner, of the College of Tasmania in Hobart, Australia, had been searching satellite tv for pc photographs of Antarctica in January 2020 whereas monitoring a path of smoke lofted into the stratosphere by Australian wildfires (SN: 3/4/20).

Warner noticed an icy melancholy, known as a doline, spanning 11 sq. kilometers and about 80 meters deep. Going via the archives, he, Fricker and their colleagues pinned down when the melancholy fashioned. Older satellite tv for pc photographs revealed {that a} lake had been at that spot since no less than 1973. Utilizing laser altimeter satellite tv for pc knowledge, the crew gleaned estimates of floor elevation adjustments over time and from these estimated how a lot water the lake as soon as held (SN: 12/18/05).

It’s unclear whether or not the lake’s disappearance is linked to local weather change. Icy lakes and dolines happen repeatedly on this ice shelf, Fricker says. However that is the primary time that scientists have had proof to piece collectively how such an occasion occurs.

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