Arctic winter sea ice loss may exceed previous estimates by 1 million sq km

Researchers from the University of Cambridge and the Center for Mathematical Research (CIMAT) in Mexico have found that Arctic winter sea ice may decrease by an additional one million square kilometers more than previously projected.

By analyzing ocean sediment samples and measuring the concentration of the IP25 biomarker—produced by algae living in sea ice—scientists reconstructed climate conditions from 6,000 years ago. They compared these findings with 27 climate models, using a statistical method to prioritize models that most accurately reproduced ancient conditions.

The study indicates that previous models overestimated the amount of Arctic winter sea ice. This new approach reportedly reduces the uncertainty range in climate projections by up to 85 percent. Because the Arctic ice cover regulates the transfer of heat and moisture from the ocean to the atmosphere, these findings suggest significant potential impacts on atmospheric circulation and winter weather patterns in Europe and North America, including lower temperatures and more intense snowfall.