Major ice-shelf loss for Canada

CelticKing · Sep 3, 2008

Major ice-shelf loss for Canada

Ward Hunt is the largest of the remnant ice shelves

Satellite images show the loss of the Markham Ice Shelf over the last year

"Long meltwater lakes" were imaged on the Markham shelf in 2005

The ice shelves in Canada's High Arctic have lost a colossal area this year, scientists report.

The floating tongues of ice attached to Ellesmere Island, which have lasted for thousands of years, have seen almost a quarter of their cover break away.

One of them, the 50 sq km (20 sq miles) Markham shelf, has completely broken off to become floating sea-ice.

Researchers say warm air temperatures and reduced sea-ice conditions in the region have assisted the break-up.

"These substantial calving events underscore the rapidity of changes taking place in the Arctic," said Trent University's Dr Derek Mueller.

"These changes are irreversible under the present climate."

Scientists reported in July that substantial slabs of ice had calved from Ward Hunt Ice Shelf, the largest of the Ellesmere shelves.

Similar changes have been seen in the other four shelves.

As well as the complete breakaway of the Markham, the Serson shelf lost two sections totalling an estimated 122 sq km (47 sq miles), and the break-up of the Ward Hunt has continued.

Cold remnants

The shelves themselves are merely remnants of a much larger feature that was once bounded to Ellesmere Island and covered almost 10,000 sq km (3,500 sq miles).

Over the past 100 years, this expanse of ice has retreated by 90%, and at the start of this summer season covered just under 1,000 sq km (400 sq miles).

Much of the area was lost during a warm period in the 1930s and 1940s.

Temperatures in the Arctic are now even higher than they were then, and a period of renewed ice shelf break-up has ensued since 2002.

Unlike much of the floating sea-ice which comes and goes, the shelves contain ice that is up to 4,500 years old.

A rapid sea-ice retreat is being experienced across the Arctic again this year, affecting both the ice attached to the coast and floating in the open ocean.

The floating sea-ice, which would normally keep the shelves hemmed in, has shrunk to just under five million sq km, the second lowest extent recorded since the era of satellite measurement began about 30 years ago.

"Reduced sea-ice conditions and unusually high air temperatures have facilitated the ice shelf losses this summer," said Dr Luke Copland from the University of Ottawa.

"And extensive new cracks across remaining parts of the Ward Hunt Ice Shelf mean that it will continue to disintegrate in the coming years."

Loss of ice in the Arctic, and in particular the extensive sea-ice, has global implications. The "white parasol" at the top of the planet reflects energy from the Sun straight back out into space, helping to cool the Earth.

Further loss of Arctic ice will see radiation absorbed by darker seawater and snow-free land, potentially warming the Earth's climate at an even faster rate than current observational data indicates.
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speeds · Sep 4, 2008

A collegue of mine was in the Arctic this summer. Last summer it took them three days to excavate at their site, this year it took them three hours. Last year he wore a winter jacket, this year he wore a sweater. Change is happening.

CelticKing · Sep 4, 2008

Its getting pretty bad speeds and the worst thing is that we all can stop it if we work together, improve transportation (trains, buses, etc) and drive less, used bikes etc. There are many other ways (companies for example) but individually we need to start somewhere.

bbwMax · Sep 5, 2008

CelticKing said: ↑

Its getting pretty bad speeds and the worst thing is that we all can stop it if we work together, improve transportation (trains, buses, etc) and drive less, used bikes etc. There are many other ways (companies for example) but individually we need to start somewhere.
Click to expand...

This is in no way me having a go at you but don't you work at an Airport? Surely one of the worst Polluters out there.

But i don't think Global warming exists. I think its just one of the worlds natural cycles. it's happened many times before and it will happen again after this. And if it is true then I will book my Scuba Diving tour of New York soon.

CelticKing · Sep 5, 2008

Max said: ↑

This is in no way me having a go at you but don't you work at an Airport? Surely one of the worst Polluters out there.

But i don't think Global warming exists. I think its just one of the worlds natural cycles. it's happened many times before and it will happen again after this. And if it is true then I will book my Scuba Diving tour of New York soon.
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Lol, yeah I work at the airport. We have clean energy though.

(nah j/k)

But I agree with you Max, I don't believe in global warming either, but lets say that it was getting to that point, why not take action and stop it before it happens. Be proactive.

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Major ice-shelf loss for Canada

CelticKing The Green Monster

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Major ice-shelf loss for Canada

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