A recent study found that crevasse formation is rapidly increasing on the Greenland Ice Sheet, the second-largest body of ice in the world. Researchers examined the ice sheet’s changes from 2016 to 2021 using 8,000 high-resolution, three-dimensional surface datasets from commercial satellites. The results show that in just five years, crevasses—wedge-shaped fissures in glaciers—have increased dramatically in depth and extent.

The study’s lead author, Dr. Tom Chudley, an assistant geography professor at Durham University, was taken aback by how quickly these changes were occurring. According to the new data, these processes are now taking place in as little as five years, whereas earlier research indicated that changes were taking place over decades, he said.

Since 1992, the melting of Greenland’s ice has caused sea levels to rise by about 14 mm. Increased surface melt brought on by warmer air temperatures and the quicker flow of ice into the ocean is a result of warming ocean waters, according to scientists.

Link Between Crevasse Growth and Ice Sheet Acceleration

Scientists have found a strong link between the acceleration of ice flow across the Greenland Ice Sheet and the rapid proliferation of crevasses. The study found that the highest increase in crevasse volume occurred in marine-terminating sectors with enhanced glacier movement, with certain regions experiencing an increase of up to 25%. On the other hand, crevasse volume decreased in regions where glaciers had slowed.

According to Chudley, scientists have been aware of the acceleration of the ice sheet since the 1990s, mostly due to ocean warming. The study reveals that crevasses emerge more quickly when ice flow increases, severely compromising the structural stability of glaciers. This mechanism may accelerate ice loss by increasing the frequency of calving events, in which large chunks of ice break off into the ocean.

To forecast the rise in sea level more accurately, the study emphasizes the necessity of enhanced large-scale modelling. Accurate long-term forecasts are difficult because many current models are unable to take into account dynamic instabilities in the ice sheet. According to Chudley, dynamic instabilities like glacier movement and fracturing might cause sea levels to increase by one meter by 2100 and by up to ten meters by 2300.

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Urgent Need for Better Predictions and Mitigation Strategies

Sea level rise forecasting models need to be improved, according to scientists, to facilitate better planning and adaptation measures. According to Chudley, to increase accuracy, current global estimates need to incorporate the most recent research on dynamic instabilities in ice movement.

An important component of ice loss feedback loops is crevasse expansion. More meltwater can enter the ice sheet as these fissures deepen, lubricating the base of the sheet and hastening its retreat into the ocean. In addition to causing sea levels to rise, this process destabilizes the ice sheet far more quickly than was previously thought.

The results highlight how urgent it is to combat climate change to reduce Greenland’s ice loss. Researchers urge immediate steps to slow down global warming and put policies in place to shield coastal communities from the long-term effects of sea level rise.

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