An immense river that flowed from one of Canada’s largest glaciers vanished over the course of four days last year, scientists have reported, in an unsettling illustration of how global warming dramatically changes the world’s geography.
The abrupt and unexpected disappearance of the Slims river, which spanned up to 150 metres at its widest points, is the first observed case of “river piracy”, in which the flow of one river is suddenly diverted into another.
For hundreds of years, the Slims carried meltwater northwards from the vast Kaskawulsh glacier in Canada’s Yukon territory into the Kluane river, then into the Yukon river towards the Bering Sea. But in spring 2016, a period of intense melting of the glacier meant the drainage gradient was tipped in favour of a second river, redirecting the meltwater to the Gulf of Alaska, thousands of miles from its original destination.
The continental-scale rearrangement was documented by a team of scientists who had been monitoring the incremental retreat of the glacier for years. But on a 2016 fieldwork expedition they were confronted with a landscape that had been radically transformed.
While the Slims had been reduced to a mere trickle, the reverse had happened to the south-flowing Alsek river, a popular whitewater rafting river that is a Unesco world heritage site. The previous year, the two rivers had been comparable in size, but the Alsek was now 60 to 70 times larger than the Slims, flow measurements revealed.
The data also showed how abrupt the change had been, with the Slims’ flow dropping precipitously from the 26 to 29 May 2016.
Geologists have previously found evidence of river piracy having taken place in the distant past. “But nobody to our knowledge has documented it happening in our lifetimes,” said Shugar. “People had looked at the geological record, thousands or millions of years ago, not the 21st century, where it’s happening under our noses.”
Between 1956 and 2007, the Kaskawulsh glacier retreated by 600-700m. In 2016, there was a sudden acceleration of the retreat, and the pulse of meltwater led to a new channel being carved through a large ice field. The new channel was able to deliver water to the Alsek’s tributary whose steeper gradient resulted in the Slims headwater being suddenly rerouted along a new southwards trajectory.
In a geological instant, the local landscape was redrawn.
Where the Slims once flowed, Dall sheep from Kluane National Park are now making their way down to eat the fresh vegetation, venturing into territory where they can legally be hunted. The formerly clear air is now often turned into a dusty haze as powerful winds whip up the exposed riverbed sediment. Fish populations are being redistributed and lake chemistry is being altered. Waterfront land, which includes the small communities of Burwash Landing and Destruction Bay, is now further from shore.
A statistical analysis, published in the journal Nature Geoscience, suggests that the dramatic changes can almost certainly be attributed to anthropogenic climate change. The calculations put chance of the piracy having occured due to natural variability at 0.5%. “So it’s 99.5% that it occurred due to warming over the industrial era,” said Best.
The Yukon region is extremely sparsely inhabited, but future river piracy could have catastrophic effects on towns, villages and ecosystems that have sprung up around available water, according to an analysis accompanying the paper, by Rachel Headley, a geologist at the University of Wisconsin-Parkside. “If a river changes course so drastically that the drainage basin no longer reaches its original outlet, this change might eventually impact human and biological communities that have grown around the river’s original outlet,” she said.
I’ve visited the Yukon several times, spending months exploring every wonderful nook and cranny from every corner of the Yukon. I loved nature’s bounty offered there, as well as the various people and cultures of the Yukon. I’m old now, but would love to have the opportunity to visit that incredible land once more before humanity changes it forever.
Read the complete article on The Guardian web site.