Chileno glacial lake, located in the Patagonia region of Chile, is seen in an undated handout photo. Meltwater from shrinking glaciers is creating vast new lakes that could eventually pose a massive flooding threat, says newly published research. (Stephan Harrison photo)

Climate change creating vast new glacial lakes, future flooding risk: research

Many glacial lakes are located in thinly inhabited locales such as Greenland

Meltwater from shrinking glaciers is creating vast lakes that could eventually pose an enormous flooding threat, says newly published research.

“Unsurprisingly, we found those lakes are growing,” said Dan Shugar, a geographer at the University of Calgary. “What was surprising was how much.”

The fact that glaciers around the world are shrinking due to climate change is well-established. What hasn’t been so well studied is where all that water is going.

In a paper published Monday in Nature Climate Change, Shugar and his colleagues provide the first global assessment of how much water is contained in so-called glacial lakes and how quickly that volume is increasing.

That assessment wasn’t possible until a few years ago, when computers finally became powerful enough to work through a world’s worth of data and 250,000 satellite images.

Glacial lakes form when meltwater from glaciers is prevented from draining by the ice itself. They form on top, in front, beside or even underneath a glacier.

They are growing at a rapid pace everywhere glaciers are found. Shugar and his colleagues estimate that the amount of water those lakes hold has increased by almost 50 per cent since 1990.

The total volume is calculated to be an almost-unimaginable 158 cubic kilometres of water. That’s a cube of icy cold water almost 5.5 kilometres long, wide and high.

Many glacial lakes are located in thinly inhabited locales such as Greenland. Others are in places like the Himalayas, where they sit alongside villages and communities.

Canadian glacial lakes are swelling as well.

Their volume across the country, including those in the High Arctic, has increased about 20 per cent and they hold about 37 cubic kilometres of water, Shugar said. The lakes in British Columbia and Yukon have increased even more quickly, almost doubling in volume over the last 30 years to 21 cubic kilometres.

They can present a hazard. Because the water is only held back by ice, glacial lakes are prone to sudden events called glacial lake outburst floods.

“In western North America, the risks aren’t as high (as the Himalayas), but they certainly aren’t zero,” said Shugar.

And when they go, they go ”absolutely gargantuan,” Shugar said.

In 1996, an outburst flood in Iceland created what was for a couple of days the second-biggest river in the world. A 1930s outburst from the Chong Khumdan glacier in the Karakoram range sent a wall of water, mud and debris nearly 26 metres high down the Indus River for about 1,500 kilometres.

Shugar said he’s not able to tell yet if GLOFs, as they are known, are becoming more frequent.

But he warns that water managers are going to have to keep an eye out for them as climate change continues to melt glaciers and fill lakes.

“Even here in the Rockies we may see increased development of these lakes,” Shugar said.

“This is an evolving hazardous landscape. This is something that needs to be constantly revisited.”

The Canadian Press

Like us on Facebook and follow us on Twitter.

Want to support local journalism? Make a donation here.

Get local stories you won't find anywhere else right to your inbox.
Sign up here

Just Posted

file
One dead after fiery crash near Agassiz

Agassiz RCMP report a 56-year-old man died Friday night

The possibility of the Canadian Premier League expanding to the Fraser Valley has been floated online. (Facebook photo)
Canadian Premier League possibly eyeing Fraser Valley expansion

Soccer league looking to add ninth team to the mix, B.C. markets potentially rumoured

Voters in Saanich North and the Islands, here lining up outside Sidney’s Mary Winspear Centre on the first day of advanced voting, are among the provincial leaders in getting in their votes early, with some 20 per cent (10,174) of eligible voters have already cast their ballots. (Wolf Depner/News Staff)
It’s Election Day in B.C.: Here’s what you need to know to vote

B.C.’s snap election has already broken records for advance voter turnout, mail-in ballots

File Photo
District of Kent hopeful for transporation grant

Staff directed to apply for $10K grant for infrastructure projects

John Redekop, with wife Doris, was the 2019 recipient of the Betty Urquhart Community Service Award from UFV. (Photo courtesy of UFV)
Nominations open until Oct. 30 for UFV’s Betty Urquhart Awards

Award recognizes ‘significant impact’ of volunteer work by an individual or group

B.C. provincial health officer Dr. Bonnie Henry gives a daily briefing on COVID-19 cases at an almost empty B.C. Legislature press theatre in Victoria, B.C., on March 25, 2020. (Don Craig/B.C. government)
B.C. sees 223 new COVID-19 cases, now 2,009 active

Two new care home outbreaks in Surrey, Burnaby

BC Liberals Leader Andrew Wilkinson, BC Greens Sonia Furstenau, BC NDP John Horgan (The Canadian Press photos)
British Columbians vote in snap election called during COVID-19 pandemic

At dissolution, the NDP and Liberals were tied with 41 seats in the legislature, while the Greens held two seats

100 Mile Conservation officer Joel Kline gingerly holds an injured but very much alive bald eagle after extracting him from a motorist’s minivan. (Photo submitted)
B.C. driver thought he retrieved a dead bald eagle – until it came to life in his backseat

The driver believed the bird to be dead and not unconscious as it turned out to be

Chastity Davis-Alphonse took the time to vote on Oct. 21. B.C’s general Election Day is Saturday, Oct. 24. (Chastity Davis-Alphonse Facebook photo)
B.C. reconciliation advocate encourages Indigenous women to vote in provincial election

Through the power of voice and education Chastity Davis-Alphonse is hopeful for change

Join Black Press Media and Do Some Good

Pay it Forward program supports local businesses in their community giving

Is it time to start thinking about greener ways to package cannabis?

Packaging suppliers are still figuring eco-friendly and affordable packaging options that fit the mandates of Cannabis Regulations

White Rock RCMP Staff Sgt. Kale Pauls has released a report on mental health and policing in the city. (File photos)
White Rock’s top cop wants to bill local health authority for lengthy mental-health calls

‘Suggestion’ included in nine-page review calling for ‘robust’ support for healthcare-led response

A Le Chateau retail store is shown in Montreal on Wednesday July 13, 2016. Le Chateau Inc. says it is seeking court protection from creditors under the Companies’ Creditors Arrangement Act to allow it to liquidate its assets and wind down its operations.THE CANADIAN PRESS/Ryan Remiorz
Clothing retailer Le Chateau plans to close its doors, files for CCAA protection

Le Chateau said it intends to remain fully operational as it liquidates its 123 stores

Most Read