Greenland glacier flood horror: 3,000 billion litres of meltwater unleashed in Greenland. In the miage, a towering melting iceberg in the icy ocean. Snow covered glacier drifts under blue sunny sky.
Credit: Shutterstock, Mozgova
‘The energy unleashed by the flood was equivalent to the output of the world’s largest nuclear power plant running at full tilt for 22 days.’
“15 million people worldwide live under the threat of deadly glacial floods.”
Scientists witness one of the largest floods in recorded history.
In a chilling first, researchers from the University of Copenhagen have captured the dramatic moment when one of the world’s largest glacial lake floods tore through East Greenland. Over 3,000 billion litres of meltwater – enough to fill three years’ worth of Denmark’s water needs – burst free, making it one of the top three largest events of its kind ever documented.
Bathtub burst: A watery disaster of epic proportions
Picture a mountain-top bathtub the size of a country, brimming with water, suddenly tipping over. That’s exactly what happened when Catalina Lake, a colossal glacial lake in East Greenland, gave way. Between September 23 and October 11, its water level plunged 154 metres, releasing a staggering 3.4 cubic kilometres of water into Scoresby Sound fjord, the planet’s largest fjord system.
“We have previously found traces of similar outburst floods, but due to polar night and clouds obstructing the potential for satellite observations, this is the first time that researchers have been able to monitor an event and measure the water volumes in real time,” said Aslak Grinsted, a climate researcher at the University of Copenhagen’s Niels Bohr Institute.
An icy cataclysm in the making
Catalina Lake had been quietly accumulating meltwater for 20 years, held back by the Edward Bailey Glacier – a towering ice dam. As the pressure built, the water eventually carved a 25-kilometre tunnel beneath the ice, exploding into the fjord. This phenomenon, called a Glacial Lake Outburst Flood (GLOF), is becoming alarmingly frequent as global temperatures soar.
“The danger from glacier-dammed lakes is increasing due to global warming. It’s vital to improve our understanding of this phenomenon to issue timely warnings should there be an imminent risk,” explained Grinsted.
While this particular flood spared Greenland’s sparse population, its global implications are chilling. “A 2023 study concluded that 15 million people worldwide live under the threat of deadly glacial floods,” he said.
A ticking time bomb for future floods
Grinsted painted a grim picture of what’s to come. “I expect that we will witness outbursts from even larger ice-dammed lakes as Greenland’s ice sheet retreats in coming centuries. At the end of the last Ice Age, Lake Missoula had an outburst that was 2,500 times larger than the recent Catalina event. To understand these massive forces, we must study the largest outbursts when they occur.”
“In this case, the energy released by the glacier flood was equivalent to the output of the world’s largest nuclear power plant running at full capacity for 22 days,” explained Grinsted.
According to the researcher, this immense energy could, in theory, be harnessed. “It’s worth considering how to harness the immense energy of such natural phenomena as a source of green energy,” he added.
But there’s a catch. “As with many other natural resources in Greenland, infrastructure is a problem. But if a brilliant engineer could figure out how to harness these meltwater outbursts, there’s enormous power and energy potential in them,” said Grinsted.
For now, this remains a dream as the nearest settlement – home to just 350 people – is 180 kilometres away.
While this event unfolded in Greenland’s icy wilderness, experts are urging people around the world to sit up and take notice. As global warming continues to melt glaciers, these potentially devastating outbursts are only set to rise. The question is, will we be ready when they strike closer to home?
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