All Jochen Knies articles
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NewsFrozen, but not sealed: algal traces reveal that Arctic Ocean remained open to life during ice ages
For years, scientists have debated whether a giant thick ice shelf once covered the entire Arctic Ocean during the coldest ice ages. Now a new study challenges this idea as the research team found no evidence for the presence of a massive ~1km ice shelf. Instead, the Arctic Ocean appears to have been covered by seasonal sea ice.