The average rate of thinning and melting more than doubled between 2004 and 2006, reports the World Glacier Monitoring Service (WGMS), a centre based at the University of Zurich in Switzerland.
“The latest figures are part of what appears to be an accelerating trend with no apparent end in sight,” said Wilfried Haeberli, director of the WGMS.
The accelerated glacier meltdown is a clear indicator that climate change has taken hold and millions if not billions will be affected, warned Achim Steiner, executive director of the U.N. Environment Programme (UNEP).
Glaciers feed the rivers that people are completely dependent on — 360 million on the Ganges in India and 388 million on the Yangtze in China alone. Reduced water or irregular water flows will make it more difficult to grow crops in these regions and other parts of the world. Rapidly melting glaciers also produce floods and raise sea levels. On average, there is one metre water of fresh water in every 1.1 metres of glacier ice.
The Service has been tracking the fate of glaciers for over a century. Continuous data series of annual mass balance, expressed as thickness change, are available for 30 reference glaciers since 1980. The ice loss in 2006 was particularly high, nearly triple that of 2005. Overall since 1980, glaciers have experienced an average net loss of 11.5 metres in ice thickness. Such losses are clearly visible in many parts of the world.
Some of the most dramatic shrinking has taken place in Europe, with Norway’s Breidalblikkbrea glacier thinning by close to 3.1 metres during 2006 alone. Recent studies indicate that most of the South American glaciers from Colombia to Chile and Argentina are drastically reducing their volume at an accelerated rate.
Nearly all glaciers in the U.S. are also in decline, says William Bidlake, a glacier expert with the U.S. Geological Survey in Washington State.
“There’s been an overall decline since the 1950s,” Bidlake told IPS.
As temperatures rise, glaciers retreat up the mountain to higher and cooler elevations. “Were seeing new real estate that hasn’t seen the light of day for thousands of years,” he said.
The mountain snowpack is more important for water flows in the U.S. but in drought years, it is the glaciers that keep water in many rivers during the hot summer months. As glaciers shrink, they have less water to supply those rivers.
This year’s cold winter in many parts of the Northern Hemisphere will do little to halt the glacier vanishing act, said Richard Alley, a glaciologist at Penn State University in the U.S.
“Glaciers don’t melt in the winter,” Alley said in an interview.
For full story see A Glacial Vanishing Act