'We Are Watching the Ice Sheet Hit a Tipping Point': Greenland Melting Even Faster Than Feared
While climate scientists have repeatedly raised alarm about the how human-caused global warming is driving “off the charts” ice loss in Greenland that will contribute to devastating sea level rise, a new analysis of a less studied region has ramped up those concerns, revealing that Greenland’s ice sheet is melting even faster than previously thought.
“We’re going to see faster and faster sea level rise for the foreseeable future.”
—Michael Bevis, Ohio State University
“We are watching the ice sheet hit a tipping point,” warned lead author Michael Bevis, a geodynamics professor at Ohio State University. “We’re going to see faster and faster sea level rise for the foreseeable future.”
Researchers often look at ice loss from large glaciers in Greenland’s southeast and northwest regions. However, this study, published Monday in the Proceedings of the National Academy of Sciences (PNAS), found that the most sustained ice loss during the decade following 2003 was in the island’s southwest region.
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“Whatever this was, it couldn’t be explained by glaciers, because there aren’t many there,” noted Bevis. “It had to be the surface mass—the ice was melting inland from the coastline.”
Using data from satellites and GPS stations across Greenland, his team found that by 2012, Greenland was losing ice at four times the rate it was in 2003, and that acceleration was focused in the southwest region. The cause of this unprecedented ice loss, they concluded, was global atmospheric warming from human activities coupled with a natural phenomenon that brings warmer air to West Greenland.
“Global warming has brought summertime temperatures in a significant portion of Greenland close to the melting point,” Bevis explained, “and the North Atlantic Oscillation has provided the extra push that caused large areas of ice to melt.”
This new study follows several others published in the past few months that show across the globe, but especially near the poles, ice is melting and oceans are warming even more rapidly than experts once feared, which could lead to worldwide sea level rise of more than 10 feet within this century alone.
“Once you hit that tipping point, the only question is: How severe does it get?”
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