Melting glaciers, fast-disappearing gauge of climate change

Patagonia's glaciers are retreating faster than anywhere else in the world
Patagonia's glaciers are retreating faster than anywhere else in the world.

A crack widens in the San Rafael glacier in Chile's extreme south, and a ten-storey iceberg crashes into the lake by the same name—a dramatic reminder of the impacts of global warming.

In the lake San Rafael, about 100 icebergs float today, pieces broken off from the glacier that 150 years ago stretched out over two-thirds of the body of water now free of .

The San Rafael glacier is one of 39 in the Northern Patagonian Ice Field (3,500 square kilometers or 1,350 square miles), which with the Southern Patagonian Ice Field (11,000 km2) in Chile's Aysen region forms one of the world's biggest ice masses.

According to the European Space Agency satellite images show San Rafael to be one of the world's most actively calving and the fastest-moving in Patagonia, "flowing" at a speed of about 7.6 kilometers (4.7 miles) per year—"receding dramatically under the influence of global warming."

Glaciers are bodies of slowly-moving ice on land that can be several hundred or several thousand years old.

Seasonal glacier melt is a natural phenomenon that with global warming has accelerated "significantly," Jorge O'Kuinghttons, a regional head of glaciology at Chile's water directorate, told AFP.

There are about 100 icebergs in San Rafael lake
There are about 100 icebergs in San Rafael lake.

'Excellent indicator'

At the moment, Patagonia's glaciers are retreating faster than anywhere else in the world.

"Glaciers are an excellent indicator of climate change," said Alexis Segovia, another government glaciologist who works in the remote region of southern Chile.

All but two of Chile's 26,000 glaciers are shrinking, he said, due to rising temperatures caused by manmade .

It is a vicious cycle.

Ice-covered surfaces of Earth reflect excess heat back into space, and if these are reduced through melting, temperatures rise even more.

Melting glaciers also add to , which increases and elevated storm surges.

And water dammed by glaciers can be released by a sudden collapse.

"Areas are being flooded these days that were never flooded before," said O'Kuinghttons.

  • All but two of Chile's 26,000 glaciers are shrinking
    All but two of Chile's 26,000 glaciers are shrinking.
  • Melting glaciers also add to sea level rise
    Melting glaciers also add to sea level rise.

To learn more about what to expect in the future, glaciologists study the evolution of Chile's glaciers, which contain a frozen record of how the climate has changed over time.

According to the WWF, more than a third of the world's remaining glaciers will melt before 2100 even if mankind manages to curb emissions from the burning of fossil fuels.

The heat is 'strong'

East of San Rafael, on the lake General Carrera that is shared by Chile and Argentina, small-scale sheep and cattle farmer Santos Catalan has been living on the forefront of the change.

To augment his income, he criss-crosses the lake in a wooden boat with glacier-watching tourists.

Patagonian ice fields in Chile
Map of Chile showing the Patagonian ice fields, the third biggest glacial ice reserve in the world.

Over the last 15 to 20 years, he told AFP, the landscape has become a lot less white as the ice has melted and snow dwindled.

"Things have changed a lot," he said. "The heat is very strong."


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Image: Laguna San Rafael National Park, Chile

© 2022 AFP

Citation: Melting glaciers, fast-disappearing gauge of climate change (2022, February 23) retrieved 27 June 2022 from https://phys.org/news/2022-02-glaciers-fast-disappering-gauge-climate.html
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