Volume 590 Issue 7844, 4 February 2021 – Nature.com

Salt-free Arctic seas
The cover shows Diamond beach and Jokulsarlon Glacier lagoon in Iceland. It is thought that much of the Arctic Ocean was once covered by an ice shelf, but clear evidence for this has proved to be elusive. In this weeks issue, Walter Geibert and his colleagues reveal results that suggest that in recent glacial periods the Arctic Ocean and adjacent Nordic seas were filled mostly with fresh water and covered by a thick ice shelf. The researchers analysed marine sediment cores…

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