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Bolivia’s fast-melting glaciers

We must be prepared for the impact of Bolivia’s fast-melting glaciers
The country’s glaciers are leaving behind lakes that could cause catastrophic flooding of vast metropolitan areas. Simon Cook considers the impact on communities living below the waters, The Independent, Simon Cook  Thursday 27 October 2016 Bolivia’s glaciers have shrunk by more than 40 per cent in the past few decades. This puts further pressure on an already stressed water supply, while the meltwater lakes left behind risk collapsing in sudden and catastrophic outburst floods. That’s the conclusion of a new study of the country’s glaciers I conducted with colleagues based in the UK and Bolivia. Our results are published in the journal The Cryosphere.

Although Bolivia sits in the tropics, the Andes run through the country like a spine. Many mountains exceed 6,000 metres, among the highest outside of south and central Asia, meaning that glaciers can exist here. Indeed, Bolivia contains around 20 per cent of the world’s so-called “tropical glaciers”. But these glaciers are very sensitive to the effects of a warming climate. Our study shows that Bolivian glaciers have shrunk by around 43 per cent since the mid-1980s – a period marked by increasing temperatures. We estimate that these glaciers will be much diminished by the end of the century.

• This matters first because people depend on water that drains from glaciers. La Paz and neighbouring El Alto draw on water from several surrounding glaciers, and together these cities form a fast-growing metropolitan area that is home to more than two million people. Throughout the year, glaciers supply around 15 per cent of the drinking water, but this proportion almost doubles during the dry season between May and October. The glaciers can’t keep “topping up” an unsustainable water supply like this. The short-term gain of more water during the dry season will turn into a longer-term water resource problem once the glaciers disappear. ….
• These disappearing glaciers also threaten to unleash sudden and devastating floods from meltwater lakes that develop as the ice recedes. ……http://www.independent.co.uk/news/science/we-must-be-prepared-for-the-impact-of-bolivia-s-fast-melting-glaciers-a7380931.html

November 27, 2016 - Posted by Christina Macpherson | Uncategorized