Some communities may run out of fresh water faster than expected
Many of the world’s glaciers contain significantly less ice than scientists previously estimated. That means some mountain communities that rely on melting ice may run out of fresh water faster, according to new research.
The amount of ice a glacier contains depends not only on its surface area, but also on the thickness of the ice itself. Scientists have on-site measurements of ice thickness from only about 4,000 glaciers around the world. For the rest of them, they’ve had to make rough approximations based on what they know about the size of the glaciers.
Millan and colleagues analyzed hundreds of thousands of satellite images taken of the same glaciers at different times. They compared the change, or flow, of the ice over time at each location and then used these calculations to estimate the amount of ice each glacier contains. If global temperatures rose high enough for mountain glaciers to disappear, then sea-level rise contributions from the vast Greenland and Antarctic ice sheets — not included in this study — would also significantly accelerate. Their contributions, combined with the 10 inches of sea-level rise from the melted mountain glaciers, would cause catastrophic destruction around the globe.
In places like the tropical Andes, on the other hand, the opposite is true. Andes glaciers contain around 27 percent less ice than scientists previously estimated, according to the new study.
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