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| Melt water from the glaciers of the Cordillera Blanca forms lagoons that in turn feed rivers and streams, 12/28/11. (photo: Michel Baraer/IPS) |
28 December 11
The water supplied by the glaciers of the Cordillera Blanca, vital to a
huge region of northwest Peru, is decreasing 20 years sooner than
expected, according to a new study.
Water flows from the region's melting glaciers have
already peaked and are in decline, Michel Baraer, a glaciologist at
Canada's McGill University, told Tierramérica. This is happening 20
to 30 years earlier than forecasted.
"Our study reveals that the glaciers feeding the Río
Santa watershed are now too small to maintain past water flows. There
will be less water, as much as 30 percent less during the dry
season," said Baraer, lead author of the study "Glacier Recession and Water Resources in Peru’s Cordillera Blanca", published Dec. 22 in the Journal of Glaciology.
When glaciers begin to shrink in size, they generate "a transitory increase in runoff as they lose mass," the study notes. However, Baraer explained, the water flowing from a
glacier eventually hits a plateau and from this point onwards there
is a decrease in the discharge of melt water. "The decline is
permanent. There is no going back." READ MORE
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