The Arctic Ocean Was Invaded by Its Neighbor Earlier Than Anyone Thought

The saltier Atlantic broke through layers of ice and freshwater, contributing to the Arctic’s warming.

The Arctic Ocean Was Invaded By Its Neighbor Earlier Than Anyone Thought

The New York Times – by Sabrina Imbler

Arctic. Atlantic. Long ago, the two oceans existed in harmony, with warm and salty Atlantic waters gently flowing into the Arctic. The layered nature of the Arctic — sea ice on top, cool freshwater in the middle and warm, salty water at the bottom — helped hold the boundary between the polar ocean and the warmer Atlantic.

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