Ngozumpa Glacier in Nepal snakes away from the sixth
highest mountain in the world, Cho Oyo.
It's not the greatest glacier to look at - far from
it. It's smothered in
a layer of rocky debris that's fallen from the surrounding cliffs, giving it a
very grey, dirty appearance.
But Ngozumpa is generating a lot of scientific
interest at the moment.
The Nepalese Himalayas have been warming significantly
more than the global mean temperature in recent decades.
Glaciers in much of the region
are showing signs of shrinking, thinning, and retreating; and this is producing
a lot of melt water.
On Ngozumpa, some of this water is seen to pool on the
surface and then drain away via a series of streams and caverns to the snout of
the glacier.
There, some 25km from the mountain, an enormous lake
is growing behind a mound of dumped rock fragments.
This lake, called Spillway, has the potential to be
about 6km long, 1km wide and 100m deep.
The concern is that this great
mass of water could eventually breach the debris dam and hurtle down the
valley, sweeping away the Sherpa villages in its path.
The threat is not immediate,
but it's a situation that needs monitoring, say scientists.
One of the researchers at work on Ngozumpa is Ulyana Horodyskyj, from the Cooperative Institute for Research in
Environmental Sciences (CIRES) at the University of Colorado in Boulder, US.
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