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AbruptSLR

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Canadian Glaciers and Ice Caps
« on: April 06, 2015, 11:00:22 PM »
The linked articles discuss projections that Alberta and BC will lose between 60 and 80% of the volume of their glaciers, as compared to 2005, by 2100.

http://www.9news.com.au/world/2015/04/07/01/49/canadian-glaciers-to-shrink-by-70-percent-by-2100

http://www.cbc.ca/news/technology/how-western-canada-glaciers-will-melt-away-1.3022242
« Last Edit: August 03, 2020, 09:36:13 PM by oren »
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Cate

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Re: Canadian Glaciers
« Reply #1 on: September 19, 2016, 01:31:27 PM »
http://www.rcinet.ca/en/2016/09/16/climate-change-does-weird-things-to-canadas-arctic-glaciers-expert/

DRY CALVING, SLUSH FLOWS. etc:

University of Calgary geography professor Brian Moorman who studies glaciers in the Canadian territory of Nunavut says in the past few years he has seen things that has never seen before or that he would not have anticipated happening.

“Like large lakes forming on top of glaciers because melting water is being produced so fast that it can’t escape, or lakes that are dammed up by glaciers catastrophically draining out and completely drying out a river valley or a lake basin in a matter of a couple of days, losing millions of cubic metres of water,” Moorman said speaking on the phone from his office in Calgary.

Moorman is undertaking his research both in the field, studying the glaciers on Bylot Island in Nunavut, as well as working with the Canadian Space Agency, using satellite radar imagery to measure ice loss of glaciers through a process known as dry calving, a natural process when the front of the glacier breaks off and crumbles to the ground at the base of the glacier....

More info and full radio interview at link.

Thanks to dt and climatehawk over at The Scribbler for the link.






Cate

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Re: Canadian Glaciers
« Reply #2 on: September 26, 2016, 12:32:47 AM »
http://blogs.agu.org/fromaglaciersperspective/2016/09/22/porcupine-glacier-bc-1-2km2-calving-event-marks-rapid-retreat/

"Porcupine Glacier is a 20-km long outlet glacier of an icefield in the Hoodoo Mountains of northern British Columbia that terminates in an expanding proglacial lake. During 2016 the glacier had a 1.2 sq km iceberg break off, leading to a retreat of 1.7 km in one year. This is an unusually large iceberg to calve off in a proglacial lake, the largest I have ever seen in British Columbia." 

--Mauri Pelto

See linked article for more info, images, etc.

Cate

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Re: Canadian Glaciers
« Reply #3 on: September 26, 2016, 12:38:45 AM »
"From a Glacier's Perspective: Glacier Change in a World of Climate Change" is a blog of the AGU on the topic of glaciers worldwide.

The link shows all entries tagged "Canada glacier retreat" and includes studies from BC, Alberta, Yukon, Labrador, and Baffin back to Sept 2015.

http://blogs.agu.org/fromaglaciersperspective/category/canada-glacier-retreat/

oren

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Re: Canadian Glaciers
« Reply #4 on: September 26, 2016, 07:17:34 AM »
Thanks for the interesting links Cate.

Cate

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Re: Canadian Glaciers
« Reply #5 on: October 13, 2016, 12:31:43 PM »
http://www.theglobeandmail.com/news/british-columbia/breakage-of-monumental-bc-iceberg-quietly-sounds-climate-change-alarm/article32341873/

Globe & Mail report on the Porcupine Glacier calving outlined in #2 above. The interesting point is that it is explicitly linked to climate change.

"A massive chunk of ice – thought to be the largest iceberg to ever break off a glacier in Canada – fell into a lake in British Columbia this summer and no one noticed until a U.S. scientist saw it on a NASA photo."

Cate

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Re: Canadian Glaciers
« Reply #6 on: February 15, 2017, 04:05:41 PM »
Thanks to Colorado Bob for the link, over on Robertscribbler. Posting here for reference.

https://news.uci.edu/research/canadian-glaciers-now-major-contributor-to-sea-level-change-uci-study-shows/

Irvine, Calif., Feb. 14, 2017 — Ice loss from Canada’s Arctic glaciers has transformed them into a major contributor to sea level change, new research by University of California, Irvine glaciologists has found.

From 2005 to 2015, surface melt off ice caps and glaciers of the Queen Elizabeth Islands grew by an astonishing 900 percent, from an average of three gigatons to 30 gigatons per year, according to results published today in the journal Environmental Research Letters...

The study provides the first long-term analysis of ice flow to the ocean, from 1991 to 2015....

The Canadian ice cap has glaciers on the move into the Arctic Ocean, Baffin Bay and Nares Strait. The researchers used satellite data and a regional climate model to tally the “balance” of total gain and loss each year, and the reasons why. Because of the huge number of glaciers terminating in area marine basins, they expected that discharge into the sea caused by tide water hitting approaching glacier fronts would be the primary cause.

In fact, they determined that until 2005, the ice loss was caused about equally by two factors: calving icebergs from glacier fronts into the ocean accounted for 52 percent, and melting on glacier surfaces exposed to air contributed 48 percent. But since then, as atmospheric temperatures have steadily climbed, surface melt now accounts for 90 percent...."



« Last Edit: February 15, 2017, 04:25:03 PM by Cate »

Cate

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Re: Canadian Glaciers
« Reply #7 on: April 01, 2017, 12:03:32 AM »

Rick Aster

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Re: Canadian Glaciers
« Reply #8 on: April 17, 2017, 06:39:10 PM »
Less glacial melt water has been flowing into the Bering Sea since the end of May 2016 after melt flow from the Kaskawulsh Glacier in southern Yukon changed direction. Previously water flowed north into the Slims River, which is now dry, and eventually to the Yukon River. A new melt water canyon in the glacier takes the water south to the Kaskawulsh River which goes to the Gulf of Alaska. The change in direction is possible because of glacial retreat, one mile in the last 100 years, according to a geologist. Study published in Nature Geoscience. Story by Brandie Weikle at CBC News: http://www.cbc.ca/news/technology/climate-change-yukon-river-piracy-1.4070153

DrTskoul

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Re: Canadian Glaciers
« Reply #9 on: April 17, 2017, 06:42:13 PM »
Cross posted from Weird Weather:

From NYTimes : Climate Change Reroutes a Yukon River in a Geological Instant

Quote
In the blink of a geological eye, climate change has helped reverse the flow of water melting from a glacier in Canada’s Yukon, a hijacking that scientists call “river piracy.”

This engaging term refers to one river capturing and diverting the flow of another. It occurred last spring at the Kaskawulsh Glacier, one of Canada’s largest, with a suddenness that startled scientists.

Much of the meltwater from the glacier normally flows to the north into the Bering Sea via the Slims and Yukon Rivers. A rapidly retreating and thinning glacier — accelerated by global warming — caused the water to redirect to the south, and into the Pacific Ocean.

Tor Bejnar

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Re: Canadian Glaciers
« Reply #10 on: April 17, 2017, 09:00:43 PM »
Also from the NYTimes article, quoting Dr. Shugar:
Quote
“We may be surprised by what climate change has in store for us — and some of the effects might be much more rapid than we are expecting.”
The statement is a bit odd (i.e., "surprise" = "more rapid than we are expecting", duh), but it hits you coming and going.
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1rover1

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Re: Canadian Glaciers
« Reply #11 on: April 12, 2018, 01:59:54 AM »
https://www.thestar.com/edmonton/2018/04/11/cool-find-u-of-a-student-discovers-lakes-under-700-metres-of-ice.html

Interesting article about a new find of a hypersaline subglacial lake under the Devon Ice Cap in Nunavut, Canada.

The full published article is here:

http://advances.sciencemag.org/content/4/4/eaar4353.full

1rover1

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Re: Canadian Glaciers
« Reply #12 on: July 07, 2020, 06:12:35 AM »
The linked article discusses the Penny Ice Cap on Baffin Island. 

Overall, there has been a four‐fold increase in mass loss from Penny Ice Cap between 1995‐2000 (‐1.3 ± 0.7 Gt a‐1) and 2005‐2013 (‐5.4 ± 1.9 Gt a‐1). The rapid upglacier migration of the equilibrium line has left large areas of sub‐surface firn in the current ablation area, and has far outpaced the ice flow response, illustrating that the ice cap is not in equilibrium, and out of balance with the current climate.

https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019JF005440

1rover1

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Re: Canadian Glaciers
« Reply #13 on: July 07, 2020, 06:50:29 AM »
A short news article regarding the acceleration, retreat, and increased calving of the Trinity and Wykeham glaciers on the eastern side of Ellesmere Island.  The terminus of these glaciers is a fiord that empties into Pikialasorsuaq, the North Water Polynya—an area of year-round open water that’s the largest of its kind in the Arctic. 

In 2000, these two glaciers produced 22 per cent of all of the icebergs in the Canadian Arctic. By 2019, they produced 65 per cent. 

nunatsiaq.com/stories/article/glaciers-that-feed-the-north-water-polynya-are-rapidly-retreating/



Freegrass

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Re: Canadian Glaciers
« Reply #14 on: August 03, 2020, 05:00:24 PM »
Canadian ice caps disappear, confirming 2017 scientific prediction


This outline of the St. Patrick Bay ice caps, taken from the 2017 The Cryosphere.

The St. Patrick Bay ice caps on the Hazen Plateau of northeastern Ellesmere Island in Nunavut, Canada, have disappeared, according to NASA satellite imagery. National Snow and Ice Data Center (NSIDC) scientists and colleagues predicted via a 2017 paper in The Cryosphere that the ice caps would melt out completely within the next five years, and recent images from NASA's Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) have confirmed that this prediction was accurate.

Mark Serreze, director of NSIDC, Distinguished Professor of Geography at the University of Colorado Boulder, and lead author on the paper, first set foot on the St. Patrick Bay ice caps in 1982 as a young graduate student. He visited the ice caps with his advisor, Ray Bradley, of the University of Massachusetts.

"When I first visited those ice caps, they seemed like such a permanent fixture of the landscape," said Serreze. "To watch them die in less than 40 years just blows me away."

In 2017, scientists compared ASTER satellite data from July 2015 to vertical aerial photographs taken in August of 1959. They found that between 1959 and 2015, the ice caps had been reduced to only five percent of their former area, and shrank noticeably between 2014 and 2015 in response to the especially warm summer in 2015. The ice caps are absent from ASTER images taken on July 14, 2020.

The St. Patrick Bay ice caps were one-half of a group of small ice caps on the Hazen Plateau, which formed and likely attained their maximum extents during the Little Ice Age, perhaps several centuries ago. The Murray and Simmons ice caps, which make up the second half of the Hazen Plateau ice caps, are located at a higher elevation and are therefore faring better, though scientists predict that their demise is imminent as well.



"We've long known that as climate change takes hold, the effects would be especially pronounced in the Arctic," said Serreze. "But the death of those two little caps that I once knew so well has made climate change very personal. All that's left are some photographs and a lot of memories."

https://phys.org/news/2020-07-canadian-ice-caps-scientific.html
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ArcticMelt2

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Re: Canadian Glaciers
« Reply #15 on: August 03, 2020, 05:15:49 PM »
The ice caps are relatively small, but the height is really great.



In 2001, ice caps were expected to disappear by 2040-2050.

« Last Edit: August 03, 2020, 09:24:02 PM by ArcticMelt2 »

Tor Bejnar

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Re: Canadian Glaciers
« Reply #16 on: August 03, 2020, 09:16:20 PM »
ice cap  ≡  a mass of ice that covers less than 50,000 km2 (19,000 sq mi) of land area (usually covering a highland area).

glacier  ≡  a persistent body of dense ice that is constantly moving under its own weight.

Ice caps, except on their edges (maybe), basically don't move much.
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Freegrass

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Re: Canadian Glaciers
« Reply #17 on: August 03, 2020, 09:24:20 PM »
This is an ice cap.



 ;D ;D ;D ;D ;D

Actually Oren told me to post that message here instead of the melting thread where I posted it first.

Maybe the title of this thread could change to Melting Canadian Glaciers and Ice Caps?
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oren

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Re: Canadian Glaciers and Ice Caps
« Reply #18 on: August 03, 2020, 09:37:20 PM »
A. I believe Tor's correction wasn't directed at you.
B. Title changed.

ArcticMelt2

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Re: Canadian Glaciers and Ice Caps
« Reply #19 on: August 03, 2020, 09:41:34 PM »
An example of how increased the rate of ice melting in the Canadian Arctic at an altitude of 800 meters above sea level.

You can imagine what happens to the sea ice, which is 800 meters below these ice caps.  :-\

Freegrass

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Re: Canadian Glaciers and Ice Caps
« Reply #20 on: August 03, 2020, 09:44:11 PM »
A. I believe Tor's correction wasn't directed at you.
Glaciers are the tears of an ice cap, right?

Quote
B. Title changed.
Right on! :)
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ArcticMelt2

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Re: Canadian Glaciers and Ice Caps
« Reply #21 on: August 03, 2020, 09:52:52 PM »
The other two ice caps turned out to be more massive and tenacious.

https://tc.copernicus.org/articles/11/169/2017/tc-11-169-2017.pdf