Temperatures are far warmer than ever observed in modern records, and sea ice extent keeps setting record lows.

2016 was the warmest year on record in the Arctic, and 2017 has picked up right where it left off. “Arctic extreme (relative) warmth continues,” Ryan Maue, a meteorologist with WeatherBell Analytics, tweeted on Wednesday, referring to January’s temperatures.

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Veteran Arctic climate scientists are stunned.

“[A]fter studying the Arctic and its climate for three and a half decades, I have concluded that what has happened over the last year goes beyond even the extreme,” wrote Mark Serreze, director of the National Snow and Ice Data Center in Boulder, Colo., in an essay for Earth magazine.

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At the North Pole, the mercury has rocketed to near the melting point twice since November, and another huge flux of warmth is projected by models next week. Their simulations predict some places in the high Arctic will rise over 50 degrees above normal.

One chart, in particular, is a jaw-dropping and emblematic display of the intensity and duration of the Arctic warmth. It illustrates the difference from normal in the number of “freezing degree days,” a measure of the accumulated cold since September.

The number of freezing degree days is far lower than any other period on record. Eric Holthaus, a meteorologist and science writer who first posted the chart to Twitter, remarked it illustrated a “stunning lack of freezing power” over the Arctic. “This is happening now,” he added. “Not in 50 or 100 years — now.”

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The chart was created by Nico Sun, a citizen scientist, using temperature data from the high Arctic, north of 80 degrees latitude, furnished by the Danish Meteorological Institute.

Because data is sparse in this region, David Titley, a professor of meteorology at Penn State and Arctic climate expert, suggested “a little” caution in interpreting the chart but said he considers it “basically right” given other data. “This is another ‘smoking gun’ pointing to rapid climate change,” he said.

Jason Furtado, a professor of meteorology at the University of Oklahoma, called the chart an “incredible” depiction of the Arctic warmth. “While the magnitude of the Arctic warmth is extraordinary in and of itself, the duration of the warmth has been astounding,” he said.

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Climate scientists say there is no single cause for the remarkable warmth, but posit it is due to natural variations in the Arctic climate superimposed on a long-term warming trend resulting from human activity.

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Walter Meier, a research scientist at NASA’s Goddard Space Flight Center and an expert on Arctic sea ice, explained that the recent lack of sea ice and warmer-than-normal ocean temperatures have “kept air temperatures higher than normal, especially in the Barents and Kara Seas” between Greenland and Siberia. “A series of storms tracking from the south has led to repeated influx of warm air and ocean waters into the region,” he said. Such an influx is predicted next week.

Sun, the chart’s creator, pointed to a recent lack of cold polar high pressure systems over the Arctic, which block heat and moisture transfer from mid-latitudes. “Now Atlantic and Pacific storms blow right into the central Arctic and transform the area from a cold, dry desert into a wet and stormy ocean,” he said.

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But it’s unclear and perhaps unlikely that this set of conditions, which has essentially opened the floodgates for an onslaught of warmth into the Arctic, represents a permanent state.

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Zack Labe, a PhD student at the University of California at Irvine who is studying Arctic sea ice and extreme weather, said that while greenhouse gases will continue leading to a warmer climate and less ice in the long run, the Arctic will probably continue to experience significant year-to-year fluctuations.

“I think we should be cautious, especially considering the resiliency of sea ice, when discussing the warming trend,” Labe said. “It remains uncertain the role natural variability may be having in individual years such as this one.”

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Yet the human influence on climate in the Arctic may be redefining the so-called natural variability, said Chip Knappenberger, a climate scientist at the Cato Institute. “Natural variability is itself is becoming increasingly ‘non-natural’ as it includes influences which themselves are shaped by anthropogenic activities,” he said.

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Such a statement is notable coming from Knappenberger, who some consider a climate change skeptic and is unconvinced climate change is a serious problem.