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Ice sheets may be melting faster than previously thought, study finds

Ice sheets may be melting faster than previously thought | Fountain: Europe Press

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ice caps According to recent studies that highlight that the planet could melt and raise ocean levels by several meters with a mere 0.5 degree increase in global warming. interaction with the weather hitherto been ignored.

ice sheets Greenland And Antarctica they have lost more than 500,000 million tons annually since 2000, the equivalent of six Olympic swimming pools every second.

But climate models hitherto underestimated their contribution to growth sea ​​level since only temperature rise was taken into account, and the interaction between the atmosphere, oceans, ice sheets and some glaciers was ignored.

A study by scientists from South Korea and the United States has found that if current climate policies are maintained, the melting of the ice sheet in Antarctica and Greenland will cause sea levels to rise by about half a meter between 2050 and 2050.

In the worst case, this figure will increase to 1.4 meters, which implies a significant increase in greenhouse gas emissions.

The experts based their forecasts on various scenarios proposed by the experts of the Intergovernmental Group of Experts on Changing of the climate (IPCC) United Nations.

“Point of Inflection”

A study published this week in the journal Connection with naturealso indicates when it can be accelerated Melting uncontrolled flow of ice caps and glaciers.

“Our model sets warming thresholds between 1.5°C and 2°C (1.8°C is the best estimate) for accelerated ice melt and sea level rise,” Fabian told AFP. -author of the study.

temperature they have already increased by almost 1.2ºC worldwide since the pre-industrial era.

scientists They have long known that the West Antarctic and Greenland ice sheets, which could raise sea levels by as much as 13 meters in the long run, have “tipping points” after which their collapse is inevitable.

But the temperatures associated with this phenomenon have never been precisely determined.

On the other hand, other research published this week in the journal Nature shows that the Thwaites Glacier in the west Antarcticacollapses in an unprecedented way.

This UK-sized glacier has already shrunk by 14 km since the 1990s, but the phenomenon has not been well studied due to a lack of data.

“Wear”

An expedition of British and American scientists drilled a hole as deep as two Eiffel Towers (600 meters) in a thick tongue of ice thrown by Thwaites into the Amundsen Sea.

They found signs of accelerated erosion, as well as cracks open sea ​​water.

“Warm water enters the cracks and erodes the glacier at its weakest point,” says Britney Schmidt, author of one of the studies and a professor at Cornell University in New York.

Another study, published in the journal Future of the Earth, highlights that rising sea levels will destroy arable land and sources drinking waterleading to the expulsion of millions of people earlier than expected.

“The time we have to prepare for increased exposure floods may be much lower than previously thought,” the authors note.

So far, the calculations have been based on misinterpreted data. By measuring the height above coastal areas with radar, treetops and rooftops were often mistaken for ground level. This means that the land is actually much lower than previously thought.

AFP


Source: RPP

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