Climate change is thinning Arctic sea ice, but contrary to conventional wisdom that’s making shipping through the North American Arctic more difficult.
A study published in Nature looked at Canada’s Northwest Passage over 15 years. It found that the melting of local ice due to global warming enables thicker ice from Greenland to flow into the corridor’s choke points, reducing the length of time when ships can move through the passage.
“First-year ice, that’s retreating. But it means the thick ice — multiyear ice — is then more able to flow down into those areas,” lead author Alison Cook, a researcher at the Scottish Association for Marine Science and the University of Ottawa, said in an interview.
That thicker ice poses hazards for ships, such as damage or sinking if there’s a collision.
