Although it may be a bit unknown, in Spain we have a glacier: the Aneto glacier, which is located in the Pyrenees. but there is bad news regarding its continuitysince although we knew that it was doomed to disappear, the reality is that the speed at which it is doing so is faster than we expected. And the latest data that has been known is clear: it has been definitively fragmented.
It’s a reality. Although it may be an appreciation of veteran mountaineers who are already tired of seeing it, the reality is very different. The conclusion has been drawn after decades of LiDAR data, photogrammetry with drones and analysis of satellite images from 1981 to 2022 which confirm that the Pyrenean colossus has entered a phase of irreversible collapse.
In this way, what was once a continuous mass of ice that flowed down the mountain is today an archipelago of fossil ice fractures that is doomed to disappear.
Catastrophic data. Thanks to all the technological means that have been used to monitor this glacier, it has been possible to make a chronology of everything that has happened. And in a single year, the ice masses of the Pyrenees They have lost an average thickness of more than one meter. In specific points, the loss of ice reached four meters, which is equivalent to one and a half floors of a building. But the important thing is that this large amount of ice has disappeared in months.
The most worrying thing is that this has occurred in a year that was not especially bad in terms of levels nor did it have the extreme heat waves of 2022. It is simply that the system could no longer take it.
An evolution. If we look back, in 2022 the Aneto glacier lost a large lower area. But now the body has split in two so the Aneto is three disconnected masses of ice. And this has consequences even in the name, since the smallest part, under the Collado de Coronas, now stops being a glacier and becomes a glacier.
If we continue looking back, there are figures that justify this thaw, since since the final of the little Ice Age in the mid-19th century and until 2017 the temperature of the area increased 1.14ºC. However, the turning point is clearly detected in the 1980s, with a dramatic acceleration of the decline starting in 2000.
The technology behind. What differentiates this monitoring from observations made in the last century is its precision. The Cryopyr team It is not limited to driving stakes into the snow and seeing its level. It has been decided to use LiDAR technology and programmed drone flights to create digital models of the terrain.
These studies, supported by publications in The Cryosphere and Naturehave made it possible to map not only the surface, but also the basal topography. Thanks to this, we know what is under the ice before it melts. And the most shocking thing is that the ice no longer flows.
This is very important because a glacier is defined by its movement; When the thickness decreases so much, gravity stops pushing it down the slope. It stagnates. It turns into fossil ice obscured by dust, which absorbs more solar radiation (lower albedo) and melts even faster. And this is what has already ended up condemning it to its disappearance without anything being able to be done to reverse it.
The case of Ossoue. If the Aneto is the symbol, the Ossoue glacier which is located on the border of Spain and France, is undoubtedly the sign that anticipated what was going to happen. This is because it has been the most affected of the season with average losses of 3.5 meters thick.
And here history gives us a striking visual reference. In 1882, Earl Henry Russell ordered caves to be excavated on the rock at ice level to celebrate parties. Today, these caves are inaccessible holes hanging tens of meters high above the current ice.
The future. What will be left when the ice is gone? This is the mandatory question after seeing this piece of ice melt in the coming years. The answer is that we will see lakes that will appear in the high mountains.
And we already have a preview of what we will see what the Innominatea lake with turquoise waters that was formed in 2015 at 3,150 meters above sea level and is considered the highest in the Pyrenees. Despite being beautiful, we must not forget that it is the liquid “corpse” of what was once an ice giant.
When will it arrive? There is no exact date on which this disappearance will end. What is known from the most recent reports is that if temperature and precipitation trends continue along the same path, all the Pyrenean glaciers will disappear within 10 years.
Images | Pablo J Danis Joan Brebo
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