Himalayan glaciers in warming danger, will affect flow of rivers like Ganga: Study
The Hindu-Kush Himalaya region covers Afghanistan, Bangladesh, Bhutan, China, India, Myanmar, Nepal and Pakistan and is home to Mount Everest, K2 and other significant peaks. The glaciers here feed rivers including the Ganges, Indus, Yellow, Mekong and Irrawaddy.Updated: Feb 05, 2019 12:39 IST
A new assessment of the Hindu-Kush Himalaya (HKH) region shows a 1.5°C rise in global temperature over pre-industrial levels will spell doom for fragile ecology of the region.
Such degree of warming is likely to lead to melting or severe retreat of one-third of the region’s glaciers, the study commissioned by Kathmandu-based International Centre for Integrated Mountain Development (ICIMOD) said on Monday.
HKH region covers Afghanistan, Bangladesh, Bhutan, China, India, Myanmar, Nepal and Pakistan and is home to Mount Everest, K2 and other significant peaks. The glaciers here feed rivers including the Ganges, Indus, Yellow, Mekong and Irrawaddy.
The assessment states glaciers in the HKH show mass loss since at least 1970s. But results from in situ measurements show the predominant mass loss happened during the last five decades, particularly since 1995.
“The greatest rates of mass loss in the extended HKH post 2000 are found in the eastern and western Himalaya. Moderate losses are observed in the central Himalaya, and the Hindu Kush. In contrast, glaciers in the Karakoram showed neutral mass balances or even slight mass gains after 2000,” the assessment said.
If global climate efforts fail, the study warns that current emissions would lead to five degrees in warming and a loss of two-thirds of the region’s glaciers by 2100.
“This is the climate crisis you haven’t heard of,” said Philippus Wester of ICIMOD, who led the assessment. “Global warming is on track to transform the frigid mountain peaks to bare rocks in a little less than a century. It’s the projected reductions in pre-monsoon river flows and changes in monsoon that will hit hardest,” he added.
The assessment was done over five years; it includes research efforts by 350 researchers and policy experts from 22 countries and 210 authors. Authors have warned changes to the timing and magnitude of this melting of glaciers can lead to increase in number and size of glacier lakes. “The findings don’t seem outlandish. I don’t know what methodologies they have adopted. But we know that mass loss of glaciers is happening. Eastern Himalayas are much more susceptible,” said Krishna AchutaRao, climate scientist at Centre for Atmospheric Sciences at IIT Delhi.
First Published: Feb 05, 2019 12:38 IST