Swiss glaciers lose 10% of volume in worst two years on record

Switzerland's glaciers suffered their second worst melt rate this year after record 2022 losses, shrinking their overall volume by 10% in the past two years, Glacier Monitoring Switzerland (Glamos) said on Thursday.

The one-two punch for Swiss glaciers during the country's third hottest summer on record means they lost as much ice in two years as in the three decades before 1990, it said, describing the losses as “catastrophic”.

“This year was very problematic for glaciers because there was little snow in winter and the summer was very warm,” Matthias Huss, who leads Glamos, told Reuters.

“The combination of these two factors is the worst that can happen to glaciers.”

More than half the glaciers in the Alps are in Switzerland, where temperatures are rising by about twice the global average due to climate change.

This year low winter snowfall combined with an early start and a late end to the summer melt season dealt the heavy losses, Glamos said.

In the peak melt month of August, the Swiss weather service said the elevation at which precipitation freezes hit a new record overnight high, measured at 5,289m, an altitude higher than Mont Blanc's summit. This exceeded last year's record of 5,184m.

Pictures posted by Huss on social media during data collection trips in recent weeks showed for the first time on record new lakes forming next to glacier tongues, streams of melt water running through ice caves and bare rock poking out from thinning ice. In some places bodies lost long ago have been recovered as ice sheets have shrunk.

“We are losing the small glaciers,” Huss said.

“The remnant ice is becoming covered by rocks and debris. Regions that have been snow and ice covered over the past decades and centuries are becoming black slopes that are dangerous because of rockfall.”

In some places, Glamos had to stop monitoring due to the melt.

“We have closed one of our monitoring programmes on a small glacier in central Switzerland because it became too dangerous to measure,” Huss said.

“It became very small and therefore unrepresentative.”

Swiss records go back to at least 1960 and as far back as 1914 for some glaciers.