Thursday, January 27, 2011

Speaking of Snow...

Himalayan glaciers not melting because of climate change.  Himalayan glaciers are actually advancing rather than retreating, claims the first major study since a controversial UN report said they would be melted within quarter of a century.
The new study by scientists at the Universities of California and Potsdam has found that half of the glaciers in the Karakoram range, in the northwestern Himlaya, are in fact advancing and that global warming is not the deciding factor in whether a glacier survives or melts.
According to the 2007 IPCC report, Himalayan glaciers were doomed to melt by 2035, a claim that had to be retracted when it was determined to have been cribbed from an advocacy group without any underlying research justification.
Their report, published in the journal Nature Geoscience, found the key factor affecting their advance or retreat is the amount of debris – rocks and mud – strewn on their surface, not the general nature of climate change. Glaciers surrounded by high mountains and covered with more than two centimetres of debris are protected from melting. Debris-covered glaciers are common in the rugged central Himalaya, but they are almost absent in subdued landscapes on the Tibetan Plateau, where retreat rates are higher.

In contrast, more than 50 per cent of observed glaciers in the Karakoram region in the northwestern Himalaya are advancing or stable. "Our study shows that there is no uniform response of Himalayan glaciers to climate change and highlights the importance of debris cover for understanding glacier retreat, an effect that has so far been neglected in predictions of future water availability or global sea level," the authors concluded.
Predictions are so much better when you actually have facts to back them up.

No comments:

Post a Comment