Glaciers in Western Canada retreat because of climate change: experts

Peyto Glacier and part of Banff National Park has lost about 70 per cent of its mass in last 50 years

Glaciers in Western Canada retreat because of climate change: experts

Climate change is prompting glaciers in British Columbia, Yukon and Alberta to retreat faster than at any time in history, threatening to raise water levels and create deserts, scientists say.

David Hik, an ecology professor at Simon Fraser University, said the region is one of the hotspots for warming and the magnitude of change in the glaciers is dramatic.

“Probably 80 per cent of the mountain glaciers in Alberta and B.C. will disappear in the next 50 years,” he said.

The Peyto Glacier in the Rocky Mountains and part of Banff National Park has lost about 70 per cent of its mass in the last 50 years, Hik said.

“It’s a small glacier but it’s typical of what we’re seeing,” he said.

Zac Robinson, a professor at the University of Alberta, said as the climate warms, the fragmentation of some of the large ice caps in the Rockies will continue.

Glaciers are formed when snow accumulates in the winter but doesn’t melt completely the following summer.

As the Earth warms at a faster rate than it did, a combination of less snow and a rapid melt is causing glaciers to recede in length and volume, Robinson said.

The first “State of the Mountains” report, co-authored by Hik and Robinson and published in May by the Alpine Club of Canada, says outside of the ice sheets of Antarctica and Greenland, Canada has more glacier cover than any other nation. Of the estimated 200,000 square kilometres of Canadian glaciers, one quarter is found in the West and the remainder are in the Canadian Arctic Archipelago.

Robinson said mountain glaciers, given their sensitivity to warming, are showing the earliest and most dramatic signs of ice loss, and the St. Elias Mountains in Yukon are losing ice at the fastest rate.

“Yukon glaciers in the St. Elias ranges have lost approximately one quarter of ice cover since the 1950s,” he said.

READ MORE: Climate change, receding glaciers increase landslide risk on B.C.’s Mount Meager

Scientists studied the glaciers using a number of methods, including analysing old photographs and remote sensing.

Hik said the rate of melting varies in different places in the Canadian West.

“We don’t have detailed measurements everywhere but where we have measurements the rates can be 25 to 70 per cent (of melt) in the last six to seven decades.”

The rates of melting are similar to what is seen in the European Alps and the Andes, he said.

One of the first effects of melting glaciers is an increase in sea level, Hik said.

Melting of the St. Elias glaciers accounted for a 1.1 millimetre increase in sea level rise in the last 50 years, Hik said.

“That doesn’t seem like very much but if you take the St. Elias Mountains, the Rocky Mountains and high Arctic mountains and the Himalayas-Hindu Kush and the Andes and the Alps, and if you put all of those contributions together it counts for one of the largest increases in sea level over the past decade.”

While the melt increases water levels and sets off coastal erosion and flooding, it also causes dry areas and dust bowls.

As glaciers recede, more water flows downhill, but the further the ice sheets retreat, the less water there is to go down stream and soon the area begins to dry, Hik said.

“In places like the Kluane River in Yukon there is significantly more dust because the valley that the river flows through is essentially dried out,” he said.

But the area still experiences katabatic winds — winds coming off the glacier — which are quite strong and blow the dust from the dried stream beds farther out on the landscape, Hik said.

This dust can create problems for vegetation by settling on trees and plants, and reducing photosynthesis, he said.

Glaciers act as a bank account during hot summers when water is scarce, Hik said.

The melt also changes the way water flows and where it accumulates, creating lakes, wetlands or desert-like conditions.

“In some places you’ll have locally increased water availability and in many, many, many places that water availability will be reduced as well,” said Hik.

The changes alter the flora of the area.

Tree lines are moving up the slope, and willows and birches — water-loving species — are prospering at higher elevations, Hik said.

Robinson said it’s important to study mountains because they respond rapidly and intensely to climate changes and are recognized as sentinels of change.

“Mountains give an important glimpse into the future and can show us what’s coming down the line.”

Hina Alam, The Canadian Press

Like us on Facebook and follow us on Twitter.

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

Just Posted

Ripy Jubbal of Abbotsford has received a 30-month jail sentence for the fraudulent use of credit cards and credit card data. (Facebook photo)
Abbotsford woman sentenced for $80K in fraudulent credit card purchases

Ripy Jubbal and spouse used identities of 19 different victims, court hears

A woman in the Harrison Mills area was attacked by a cougar on Tuesday, May 4. (File photo)
UPDATE: 2 cougars killed following attack in Harrison Mills

Attack victim remains in hospital in stable condition

....
Abbotsford graphic designer pitches Flyers rebrand for AHL team

Alex Svarez suggests new affiliate team turns back the clock and brings back Flyers moniker

Mike Haire, a former vice-principal at W. A. Fraser Middle School in Abbotsford, began court proceedings on Monday, May 3 in New Westminster for two child pornography offences.
Trial paused for former Abbotsford vice-principal charged with child porn

Judge reserves decision on admissibility of evidence against Mike Haire

Abbotsford’s Jake Virtanen is now under investigation from the Vancouver Police Department following sexual misconduct allegations. (John Morrow/Abbotsford News)
Vancouver police investigating sexual misconduct claims against Canucks’ Jake Virtanen

Abbotsford native remains on leave with the Vancouver Canucks following recent allegations

Jose Marchand prepares Pfizer COVID-19 vaccination doses at a mobile clinic for members of First Nations and their partners, in Montreal, Friday, April 30, 2021. The National Advisory Committee on Immunization is coming under fire after contradicting the advice Canadians have been receiving for weeks to take the first vaccine against COVID-19 that they’re offered. THE CANADIAN PRESS/Ryan Remiorz
Trudeau says he is glad he got AstraZeneca, vaccines are only way out of pandemic

‘The most important thing is to get vaccinated with the first vaccine offered to you’

B.C.’s provincial health officer, Dr. Bonnie Henry. THE CANADIAN PRESS/Jonathan Hayward
Dip in COVID-19 cases with 572 newly announced in B.C.

No new deaths have been reported but hospitalized patients are up to 481, with 161 being treated in intensive care

Solar panels on a parking garage at the University of B.C. will be used to separate water into oxygen and hydrogen, the latter captured to supply a vehicle filling station. (UBC video)
UBC parkade project to use solar energy for hydrogen vehicles

Demonstration project gets $5.6M in low-carbon fuel credits

FILE – A student arrives at school as teachers dressed in red participate in a solidarity march to raise awareness about cases of COVID-19 at Ecole Woodward Hill Elementary School, in Surrey, B.C., on Tuesday, February 23, 2021. THE CANADIAN PRESS/Darryl Dyck
B.C. ‘should be able to’ offer 1st dose of COVID vaccine to kids 12+ by end of June: Henry

Health Canada authorized the vaccine for younger teens this morning

A woman wears a face mask and shield to curb the spread of COVID-19 while walking in North Vancouver, B.C., on Wednesday, January 6, 2021. THE CANADIAN PRESS/Darryl Dyck
B.C. CDC updates info, acknowledging small respiratory droplets can spread COVID-19

Large droplets, not aerosols had been fixture of public health messaging for many months

A picture of Shirley Ann Soosay was rendered from a postmortem photographer and circulated on social media. (DDP graphic)
B.C. genealogist key to naming murder victim in decades-old California cold case

In July 1980, Shirley Ann Soosay was raped and stabbed to death

Mary Kitagawa was born on Salt Spring Island and was seven years old when she was interned along with 22,000 B.C. residents in 1942. (B.C. government video)
B.C. funds health services for survivors of Japanese internment

Seniors describe legacy of World War II displacement

Meghan Gilley, a 35-year-old emergency room doctor and new mom was vaccinated from COVID-19 in January, while she was pregnant. She’s encouraging others to do the same. (Submitted)
‘The best decision’: B.C. mom encourages other pregnant women to get COVID-19 shot

Meghan Gilley, 35, delivered a healthy baby after being vaccinated against the virus while pregnant

Most Read