Evidence of algae growth and climate simulations reveal the Arctic had seasonal ice, not a permanent ice shelf, for much of the past 750,000 years. These insights challenge long-standing theories. For a long time, researchers have debated whether a thick, continuous ice shelf once blanketed the entire Arctic Ocean during the most extreme ice ages. […]



Summary

New evidence from algae and climate models suggests the Arctic Ocean was not permanently covered by a massive ice shelf for the majority of the last 750,000 years, even during glacial periods. Instead, the region likely experienced seasonal sea ice. This finding contradicts earlier assumptions of a thick, persistent ice sheet dominating the Arctic landscape, reshaping our understanding of past Arctic conditions and potentially impacting future climate projections. The discovery challenges long-held theories about the Arctic’s glacial history.

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