The report, by senior glaciologist Vijay Kumar Raina, formerly of the Geological Survey of India, seeks to correct a widely held misimpression based on measurements of a handful of glaciers: that India’s 10,000 or so Himalayan glaciers are shrinking rapidly in response to climate change. That’s not so, Raina says.
Even if it were, other researchers argue that severe loss of ice mass would not entail drastic water shortages in the Indian heartland, as some fear. Both concerns were cited in the Asia chapter of the U.N. Intergovernmental Panel on Climate Change’s (IPCC’s) 2007 Working Group II report, which asserted that Himalayan glaciers “are receding faster than in any other part of the world and, if the present rate continues, the likelihood of them disappearing by the year 2035 and perhaps sooner is very high if the Earth keeps warming at the current rate.”
The Raina report draws on published studies and unpublished findings from half a dozen Indian groups who have analyzed remote-sensing satellite data or conducted arduous surveys at remote sites often higher than 5000 meters. The report revises perceptions of a number of glaciers, including two iconic ones.
For example, the 30-kilometer long Gangotri glacier, source of the Ganges River, retreated an average of 22 meters a year and shed a total of 5% of its length from 1934 to 2003. But in 2004 and 2005, the retreat slowed to about 12 meters a year, and since September 2007 Gangotri has been “practically at a standstill,” according to Raina’s report, which cites, among other observations, field measurements by ecologist Kireet Kumar of the G. B. Pant Institute of Himalayan Environment and Development in Almora. Even more stable is Siachin glacier in Kashmir, where Indian and Pakistani forces are stationed eyeball to eyeball at 6000 meters. Claims reported in the popular press that Siachin has shrunk as much as 50% are simply wrong, says Raina, whose report notes that the glacier has “not shown any remarkable retreat in the last 50 years.”