Rising Sea Level Threat: Glaciers 'Beyond the Point of No Return'

Glaciers in the West Antarctic “have passed the point of no return,” threatening greater sea level rise impacts than previously thought, scientists at NASA and the University of California, Irvine warning in a new study.

The findings, which focus on the Amundsen Sea sector of West Antarctica, were published in the journal Geophysical Research Letters.

The glaciers’ grounding lines — the points at least one thousand feet below ice where they first lose contact with land — are moving further inland, and as that happens, the glaciers’ flow speeds accelerate. And the faster they flow, the more they thin— that means their days are likely numbered.

Only one of the six glaciers they studied, the Haynes Glacier, had an obstruction upstream to slow down these changes, but even its retreat is moving as quickly as the others, the scientists found.

Given these changes, glaciologist and lead author Eric Rignot, of UC Irvine and NASA’s Jet Propulsion Laboratory in Pasadena, California, stated, “The collapse of this sector of West Antarctica appears to be unstoppable.”

“The fact that the retreat is happening simultaneously over a large sector suggests it was triggered by a common cause, such as an increase in the amount of ocean heat beneath the floating sections of the glaciers. At this point, the end of this sector appears to be inevitable,” he warned, adding that “a conservative estimate is it could take several centuries for all of the ice to flow into the sea.”