Arctic Warming Is Happening Faster Than Described, Analysis Shows

The rapid warming of the Arctic, a definitive sign of climate change, is occurring even faster than previously described, researchers in Finland said Thursday. From a report: Over the past four decades the region has been heating up four times faster than the global average, not the commonly reported two to three times. And some parts of the region, notably the Barents Sea north of Norway and Russia, are warming up to seven times faster, they said. The result is faster melting of the Greenland ice sheet, which leads to greater sea-level rise. But it also affects atmospheric circulation in North America and elsewhere, with impacts on weather like extreme rainfall and heat waves, although some of the impacts are a subject of debate among scientists. While scientists have long known that average temperatures in the Arctic are increasing faster than the rest of the planet, the rate has been a source of confusion. Studies and news accounts have estimated it is two to three times faster than the global average. Mika Rantanen, a researcher at the Finnish Meteorological Institute in Helsinki, said he and his colleagues decided to look at the issue in the summer of 2020, when intense heat waves in the Siberian Arctic drew a lot of attention. The new findings are bolstered by those of another recent study, led by scientists at Los Alamos National Laboratory, which found similar rates of warming, although over a different time span.

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