Engineers solve puzzle of Arctic sea ice movement
Arctic sea ice moves and spreads in ways that wind alone cannot explain. A new UC Riverside-led study finds that collisions between individual pieces of ice provide a surprisingly simple explanation for these movements, potentially offering scientists a better way to predict where sea ice will travel as the Arctic warms.
Arctic sea ice doesn't simply drift with the wind. A study led by UC Riverside scientists reveals collisions between individual ice floes are the key to understanding its complex movement. The research, published in Physical Review Letters, suggests collisions dissipate the wind's energy and limit how far a floe can travel before hitting another piece of ice.
This simple interaction explains why sea ice spreads more slowly and more erratically than wind alone would predict. The study, led by Bryan Shaddy and Alex Greaney, used a computer simulation to model the floes behaving like floating grains in a silo, accounting for drag from the ocean and collisions. When tested against real measurements in the Fram Strait, the model successfully reproduced key observations about how quickly ice spreads, the distribution of floe speeds, and how motion varies over time.
The frequent collisions in dense ice fields slow down dispersal, providing a framework for predicting sea ice transport as Arctic conditions change. While the study doesn't predict future changes due to warming, it offers a physics-based approach to understanding and potentially modeling this critical aspect of Arctic climate change.
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