A new global analysis suggests glaciers in the Andes contain less ice than we thought, but the glaciers of the Himalayas are thicker – significant findings for the millions of people who rely on the ice for water
Maciej Bledowski / Alamy
People living in the Andes in South America will reach “peak water” – defined as a declining availability of water – much sooner than expected because the glaciers they rely on have been found to be much thinner than thought. The area’s glaciers have 27 per cent less ice than than previously estimated, according to a new global assessment of the thickness of the world’s glaciers. The work found stark regional differences in terms of fresh water supplies.
The study, which excludes Antarctica and Greenland, found that glaciers in the Himalayas have 37 per cent more ice than thought. That is good news for the“This new data set of the world’s glaciers has a huge impact on water resources,” saysat Grenoble Alpes University, France, who led the analysis. “In some regions, it’s positive, because in the Himalayas it reduces the pressure on the fresh water, but in other regions like the Andes, it’s increasing the pressure on fresh water availability.
Millan and his colleagues arrived at their estimates by amassing 812,000 satellite photos of three glaciers, taken 400 days apart, to measure the velocity of the world’s rivers of ice. Previous studies estimating the ice thickness of glaciers have relied mostly on looking at the slope of the glaciers rather than the speed at which they move.
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