Warm Atlantic waters, delivered by an offshoot of the Gulf Stream, have long been known to prevent ice formation north of Scandinavia, on the western side of
the Eurasian basin.
On the eastern side of
the Eurasian basin, say Polyakov and his colleagues, air temperatures were the main culprit for ice melting in the 2000s.
The result, he says, is an increased «Atlantification» of the Arctic, where the eastern side of
the Eurasian basin is becoming more like the western side, the team reports today in Science.
Deep below the Arctic sits a ridge that splits the ocean roughly in half: The Amerasian basin sits on the North American side, whereas
the Eurasian basin lies north of Europe and most of Asia.