"Jones and his colleagues, in their new study in Environmental Research Letters, calculate that the coast on average is retreating inland by 56 feet per year, or just under 20 yards. That’s an increase of 2.5 times above measured rates.
Calculating the consequences over a five-and-a-half mile stretch of coastline, Jones said means that about 30 football fields are being lost annually, and about 300 were lost in total between 2007 and 2016.
Few other stretches of Arctic coastline are being watched in the same way. Jones estimates that only 1 to 2 percent of Arctic coastlines have been surveyed to study how much they’re eroding, and few to the extent that Drew Point has been.
Yet vulnerable permafrost — the reason for what’s happening at Drew Point — is present across the Arctic.
The bluffs at Drew Point are composed of a mixture of frozen soil and thick wedges of ice. They are very sensitive to temperature — and both the air and the sea alike in this location have been getting warmer.
Perhaps more important, though, is that with the retreat of Arctic sea ice, the period of open water offshore, when waves can break free from winter ice, is getting longer. This allows waves to slam into the coast, the most immediate trigger of the loss of land.
“Bringing the level of the sea up to the base of the bluff, eats away at the base of the ice-rich permafrost, eroding it both thermally and mechanically,” said Jones."
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https://www.washingtonpost.com/energy-environment/2018/11/14/scientists-acknowledge-key-errors-study-how-fast-oceans-are-warming/