This occurs when sea ice and snow, which naturally reflect the Sun’s heat, melt into sea water, which absorbs it instead.
While there is a long-held consensus among scientists that the Arctic is warming quickly, estimates vary according to the timeframe studied and the definition of what constitutes the geographic area of the Arctic.
A team of researchers based in Norway and Finland analysed four sets of temperature data gathered by satellite studies since 1979 — the year when satellite data became available — over the entire Arctic circle.
They found that on average the data showed the Arctic had warmed 0.75C per decade, nearly four times quicker than the rest of the planet.
“The take in the literature is that the Arctic is warming about twice as fast as the globe, so for me it was a bit surprising that ours was so much higher than the usual number,” Antti Lipponen, co-author from the Finnish Meteorological Institute, told AFP.
The study, published in the journal Communications Earth & Environment, found significant regional variations in warming rate within the Arctic circle.
For example, the Eurasian sector of the Arctic Ocean, near the Svalbard and Novaya Zemlya archipelagos, has warmed as much as 1.25C per decade — seven times faster than the rest of the world.
The team found that even state-of-the-art climate models predicted Arctic warming to be approximately one third lower than what the observed data showed.
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They said that this discrepancy may be due to previous modelled estimates being rendered out of date by continued Arctic modelling.
“Maybe the next step would be to take a look at the models and I would be really interested in seeing why the models do not reproduce what we see in observations and what impact that is having on future climate projections,” said Lipponen.
As well as profoundly impacting local communities and wildlife that rely on sea ice to hunt, intense warming in the Arctic will have worldwide repercussions.
The Greenland ice sheet, which recent studies warn may be approaching a melting “tipping point”, contains enough frozen water to lift Earth’s oceans some six metres.
“Climate change is caused by humans. As the Arctic warms up its glaciers will melt and this will globally affect sea levels,” said Lipponen.
“Something is happening in the Arctic and it will affect us all.”
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