Heat wave had 'worrisome' impact on B.C.'s glaciers, expert says

Last week's unprecedented heat wave in British Columbia has harmful implications for the province's approximately 17,000 glaciers, a leading Canadian expert says.

According to Brian Menounos,Canadaresearch chair in glacier change, rapid snowmelt this early in the summer means glaciers will be exposed to warmer weather longer without that buffer of snow.

In addition, those glaciersusually feed headwater streams with fresh water in late summer, and not having that runoff because of the early melt could affect ecosystems and hydropower capacity, said Menounos, a geography professor at the University of Northern British Columbia

"That much energy and that much heat throughout the province over all of the glaciers was quite worrisome," he told CBC's The Early Editionon Thursday.

"The glacier runoff tends to start to supplement some of our headwater streams in late summer, typicallyend of July. We're seeing that starting much earlier this year, unfortunately, due to the heat dome."

Menounos said regardless of the heat dome which led to almost 60 temperature records being broken in the province including an all-time Canadian high of 49.6 C in Lytton, B.C. glacier melt is already happening at an unsustainable level.

"What's truly alarming is how quickly some of these small glaciers are disappearing and the implications for this glacier loss," said Menounos.

He said the implication for hydroelectric power in some areas is substantial and, in some cases, the loss of glaciers could mean the potential loss of sensitive aquatic ecosystems.

A 2015 study published in Nature Geoscience predictedthat 70 per cent of glaciers in Western Canada will becompletely gone by 2100and thatthe fastest rate of ice loss, corresponding to higher rates of meltwater to rivers, will happen from2020 to 2040.

This melt also contributes to flooding.

The B.C. River Forecast Centre called the amount of snowmelt at the higher elevations "astounding" during the heat wave and flood warnings were in effect for many parts of the province during the last days of June.

"Please be advised that with the extreme hot weather, river levels are extremely high," officials for Mount Robson Provincial Park in B.C. warned on June 30.

On July 1, three hiking trails, including the highly popular Berg Lake trail by Mount Robson,needed to be closed because of damage from flooding waters.

Menounos also warned that as glaciers melt and retreat, they can create instability in steep slopes that can cause dangerous landslides.

WATCH|Brian Menounos explains connection betweenmelting glaciers andlandslides:

Landslides can be triggered by melting glaciers

3 years ago

Duration 0:41

Brian Menounos, a professor of geography at the University of Northern British Columbia, explains why destructive landslides are a concern in mountainous B.C.

"I would say the Coast Mountains [are]an area that we have to keep our eye on and certainly there's a lot of people that live in those communities," he said.

The heat wave that blanketed B.C. also crossed the Rocky Mountains and warmed up Alberta.

Using data from theAgriculture and Forestry Department of Alberta andEnvironment Canada,University of Alberta glaciologist Jeffrey Kavanaugh estimates that the resulting melt from glaciers in the mountains during the same10-day period was about three times higher than normal, compared with the past 12 years.

LISTEN| Menounos talks to CBC's The Early Edition host Stephen Quinnabout glacier melt: