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Global warming can alter Earth’s shape: study

Scientists say glaciers in warmer Patagonia moved faster and caused more erosion than those in Antarctica

Toronto: Climate change is not only causing warmer oceans and erratic weather, it also has the capacity to alter the shape of our planet, a new study has warned.

In a five-year study, researchers compared glaciers in Patagonia and in the Antarctic Peninsula. They found that glaciers in warmer Patagonia moved faster and caused more erosion than those in Antarctica, as warmer temperatures and melting ice helped lubricate the bed of the glaciers.

“We found that glaciers erode 100 to 1,000 times faster in Patagonia than they do in Antarctica," said lead author Michele Koppes, assistant professor at the University of British Columbia.

“Antarctica is warming up, and as it moves to temperatures above 0 degrees Celsius, the glaciers are all going to start moving faster," said Koppes. “We are already seeing that the ice sheets are starting to move faster and should become more erosive, digging deeper valleys and shedding more sediment into the oceans," she said.

The repercussions of this erosion add to the already complex effects of climate change in the polar regions. Faster moving glaciers deposit more sediment in downstream basins and on the continental shelves, potentially impacting fisheries, dams and access to clean freshwater in mountain communities.

“The polar continental margins in particular are hotspots of biodiversity. If you’re pumping out that much more sediment into the water, you’re changing the aquatic habitat," said Koppes.

The Canadian Arctic, one of the most rapidly warming regions of the world, will feel these effects acutely. With more than four degrees Celsius of warming over the last 50 years, the glaciers are on the brink of a major shift that will see them flowing up to 100 times faster if the climate shifts above zero degrees Celsius.

The findings by Koppes and coauthors also settle a scientific debate about when glaciers have the greatest impact on shaping landscapes and creating relief, suggesting that they do the most erosive work near the end of each cycle of glaciation, rather than at the peak of ice cover.

The study was published in the journal Nature.

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