Salty Atlantic waters may have been seeping into the Arctic since the early 20th century, several decades earlier than previously believed. The Arctic is warming faster than any other part of the world and the increasing influence of water from the Atlantic Ocean, which is on average warmer and saltier than the Arctic Ocean, is likely to be leading to further ice loss.
This effect is known as “Atlantification”, says Tesi Tommaso at the Italian National Research Council Institute of Polar Sciences. But it is hard to quantify because we only have 20 years of confirmed data about the interaction between these waters, he adds.
He and his colleagues studied the Fram Strait in the Arctic Ocean between Greenland and the Norwegian archipelago Svalbard. They collected a 112-centimetre sediment core from the bottom of one of Svalbard’s inlets to reconstruct the history of the strait.
Source : https://www.newscientist.com/article/2298982-atlantic-ocean-water-began-warming-the-arctic-as-early-as-1907/363