Ice-free Alps? It could be a reality by 2100

by Malavika Vyawahare on 9 April 2019

• Even without additional warming, Alpian glaciers stand to lose 50 percent of their glacial mass by 2050 because of warming that has already occurred.
• The Alps are not just an iconic tourist destination, they also feed rivers and support ecosystems downstream.
• A majority of ice loss cannot be avoided, researchers say, but stronger actions to curb greenhouse gas emissions can help limit the loss.

The iconic snow-capped Alpine peaks may be a thing of the past for future generations if average global temperatures keep rising unchecked, a new study warns.
The study, in the journal The Cryosphere, posits that by 2100 the Alps will be “mostly ice-free” if greenhouse gas emissions increase rapidly over the next few decades. The findings were presented at the General Assembly of the European Geosciences Union in Vienna on April 9.
“The results of the study are alarming and sad, but unfortunately quite realistic,” said Markus Stoffel, an expert on climate change impacts at the University of Geneva. “They are based on state-of-the-art glacier models and the latest generation of regional climate models.”

Evolution of Pizol glacier between 2006 and 2018. This small glacier is very likely to disappear in the near future. Photo by M. Huss

Even under moderate warming, Alpine glaciers would shed two-thirds of their present mass by the end of the century. “The losses are not only the result of future climate change but also the consequence of the warming that we are living through since the start of industrialization and — more drastically — since the 1980s,” Stoffel said.
The Alps straddle eight European countries and attract millions of tourists every year, occupying a central place in European culture. But the mountain range also provides drinking water and irrigation water for lowland Europe, and supports hydroelectricity generation.
To determine how the Alpine glaciers will respond to warming, the researchers used a  dynamical ice flow computer model that captured not just melt processes but also ice flow processes, which previous estimates did not explicitly taken into account.
Their results concur with earlier estimates for glacial mass loss, according to experts, and confirmed another dismaying conclusion: the Alps would lose about half of their glacial mass by 2050 even without any additional warming. This will happen because significant increases in average temperatures are expected in the second half of the century and because glaciers respond slowly to a changing climate.

A large moulin on Plaine Morte glacier through which water runs to the glacier bed during the annual drainage of an ice-dammed lake. Photo by M. Huss

“The glacier response time is related to the fact that glaciers are at this moment ‘too big’ for the climate they are located in,” said Harry Zekollari, now at the Delft University of Technology, Netherlands, and a co-author of the paper. “In other words: they reflect earlier climatic conditions.”
While they are a vital source of water supply and hydroelectricity, the Alps also provide freshwater that supports ecosystems. “The melting of glaciers will alter runoff, and thereby influence water availability downstream of glaciers,” Stoffel said. “Also, warmer temperatures and smaller glacier water contributions will affect water temperatures, with consequences on aquatic ecosystems and invertebrates.”
River life, and riverside habitats that are important for birds, may be the first to be affected. The loss of Alpine glaciers is likely to have cascading effects on the wider ecosystems and other flora and fauna, but these effects are not yet fully understood.
“What is noteworthy is that warming in the Alps has almost been twice as much as in lowlands,” Stoffel said, “and consequences might be worse in Alpine environments than elsewhere.”

CITATION:
Zekollari, H., Huss, M., and Farinotti, D. (2019): Modelling the future volution of glaciers in the European Alps under the EURO-CORDEX RCM ensemble. The Cryosphere, 13, 1125-1146.

Article appeared here - https://news.mongabay.com/2019/04/ice-free-alps-it-could-be-a-reality-by-2100/