No glaciers, no water?

phys.org | 2/9/2018 | Staff
gracey (Posted by) Level 3
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The world's largest rivers begin in glaciated mountain regions. However, climate change may cause many glaciers to disappear. Will water become scarce?

There are around 200,000 glaciers worldwide. They play a central role in the water cycle, particularly in the middle and low latitudes, by offsetting runoff fluctuations. Rivers are lifelines on which billions of people depend worldwide, either directly or indirectly.

Water - Scarce - Future - Glaciers - Alps

Will water become scarce in the near or distant future if glaciers become increasingly smaller or disappear completely? Will the Alps, the Himalayas, the Rocky Mountains and the Andes continue to act as water towers? We set out to answer this question in a study of all the earth's mountain regions and the drainage basins of their large rivers.

Decisive "peak water"

Model - Development - Glaciers - Future - Runoff

We used a glacier model that describes the development of glaciers worldwide and their future runoff until the end of the 21st century. First, the good news: ice-covered mountains will continue to provide enough water throughout the year in future. In an initial phase, climate change will actually cause the runoff to increase, as water stored as ice is released. However, if the glacier becomes too small, it will reach a tipping point, which we call "peak water".

The key point: in order to properly plan the distribution of water in future, for example for agricultural irrigation or hydropower, we have to know whether we are before or after "peak water". In the Alps, the tipping point is now. In most of the drainage basins in South America, the glaciers are already providing less water. However, in Asia and North America, the total runoff from glaciers will continue to increase until around the middle of the century, and will only then begin its downward trend.

People - Lowlands - Difference

Will people in the lowlands notice the difference?

Glaciers stabilise river levels in summer via high volumes of...
(Excerpt) Read more at: phys.org
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