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Massive icefalls at Argentina's Perito Moreno Glacier cause awe and alarm

Massive icefalls at Argentina's Perito Moreno Glacier cause awe and alarm

A deep cracking noise from the ice foretells the imminent dramatic fall. A block of ice 70 meters tall (230 feet) - about the height of a 20 story building - falls from the Perito-Moreno glacier face into the aquamarine waters below.

Visitors to Argentina's most famous Glacier have been drawn by the sight for many years. They wait on platforms in front of the ice for the next crack that will split the cool Patagonian atmosphere.

The size of ice fragments that are breaking off, a process known as "calving", has recently begun to alarm local glaciologists and guides, who were already concerned about the prolonged retreat of Perito Moreno. This glacier had defied the trend by maintaining its mass despite warmer climates causing glacial melt worldwide.

Pablo Quinteros is an official guide for Los Glaciares National Park, located in Santa Cruz province's southern part.

"Icebergs of this size have only been visible in the past four to six year," he said during a trip in April.

For decades, the face of the glacier that flows from Andean mountains to the waters of Lake Argentina had been more or less stable, with some years seeing an advance and others a retreat. In the last five decades, however, there has been a more pronounced retreat.

It had been in the same position or a similar one for the last 80 years. "That's unusual," said Argentine iceologist Lucas Ruiz, with the state science organisation CONICET. His research focuses on the future of Patagonian ice in the face climate change.

The Perito Moreno Glacier's face has begun to show signs of retreat since 2020.

He said the glacier would rebound, as it had done in the past, but for now it is losing between one to two meters of water per year. If this trend continues, the loss could accelerate.

Ruiz, a co-author of the 2024 state-sponsored report and a member of Argentina's Congress at the time, presented it to Congress. The report showed that, while Perito's mass was stable over the past half-century, the loss in mass since 2015 is the most rapid and prolonged in 47 years. It averages 0.85 meters per annum.

According to a UNESCO study published in March, glaciers are disappearing more quickly than ever. The last three years saw the greatest loss of mass on record.

You can't grasp the enormity of it

Ruiz stated that instruments used by his research team to monitor the glacier showed an increase in air temperatures in the area of 0.06 degrees Celsius every decade, and precipitation declining, indicating less accumulation of snow or ice.

Ruiz explained that "the thing about Perito Moreno was that it took some time to feel the climate change effects." Currently, however, melting and calving of the glacier's bottom is outpacing the accumulation of ice on the glacier's top.

The changes we see today show that the balance of forces has been upset, and today's glacier is losing in both thickness and area."

The glacier is still a popular attraction among tourists who take boats to witness the calving of the icebergs and their movement around the lake.

"It's insane. "It's insane," said Brazilian Giovanna Macado, on the deck of a boat that has to be cautious of sudden icefalls.

It's amazing. You can't even imagine the size of it in pictures. It's amazing. "I think everyone should visit here at least once during their lifetime." (Reporting and writing by Adam Jourdan, with additional reporting by Nicolas Cortes, Juan Bustamante and Bernan Parera. Editing and proofreading by Katy Daigle & Rosalba o'Brien).

(source: Reuters)