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June 26 2022

Coronavirus / Russia-Ukraine

Near future

Climate, the heat clears the glaciers: 1000 more lakes in the Swiss Alps

Gianluca Riccio di  Gianluca Riccio
July 22 2021
in Environment
Swiss Alps
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Climate change has drastically changed the landscape of the Swiss Alps at a faster rate than expected. The melting of glaciers created more than 1.000 new mountain lakes, according to a study published Monday.

To be more precise: the inventory of Swiss glacial lakes shows almost 1.200 more new lakes. They were in formerly frozen regions of the Swiss Alps, and since the end of the Little Ice Age around 1850.

That's far more than the few hundred researchers expected to find at the start of the project.

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"We were surprised by the numbers," he says in a statement Daniel Odermatt, head of the Eawag Remote Sensing group that conducted the study on the Swiss Alps. The “marked acceleration of formation” is also surprising, underlining that “in the last decade alone, 180 lakes have been added”.

According to an annual study published by the Swiss Academies of Sciences, glaciers in the Swiss Alps are in constant decline, losing as much as 2% of their volume last year alone.

Even if the world were to fully implement the 2015 Paris Agreement (which plans to limit global warming by at least two degrees Celsius. Never gonna happen) probably two-thirds of Alpine glaciers would be lost, according to a 2019 study by the technical university ETH Zurich.

Swiss Alps, visible evidence of change

The Eawag assessment showed that there was an initial peak in the formation of glacial lakes in the Swiss Alps between 1946 and 1973, when on average nearly eight new lakes appeared each year. After a short decline, the lake formation rate is increased between 2006 and 2016, with 18 new lakes appearing annually on averageor, while the surface of the water swelled by more than 400 square meters (4.300 square feet) per year.

This, Eawag said, is "visible evidence of climate change in the Swiss Alps."

The comprehensive inventory was made possible by large amounts of data collected from Swiss glaciers since the mid-XNUMXth century. In total, the researchers were able to draw on the data from seven periods between 1850 and 2016.

For each of the 1.200 lakes formed since 1850, scientists recorded the location, elevation, shape and area of ​​the lake at different times, as well as the type of dam material and surface drainage. Based on this background information, researchers can estimate the hazards, including the risk of sudden emptying in the event of a dam failure.

Eawag warned that the growing number of glacial lakes increases the risk of such accidents, and therefore the danger of floodwaters for the settlements below.

tags: Alpsglaciers

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