Scientists previously estimated that the Arctic is heating up about twice as fast as the globe overall, but a new study finds that's a significant underestimate. Loss of sea ice is one of the clearest drivers behind the rapid warming.
Temperatures in Longyearbyen, Norway above the Arctic Circle hit a new record above 70 degrees Fahrenheit in July 2020. The Arctic has warmed nearly four times faster than the planet as a whole since 1979, a new study finds.
The study focuses on the period between 1979, when reliable satellite measurements of global temperatures began, and 2021. There are many reasons why the Arctic is heating up more quickly than other parts of the Earth. Changes in the amount of air pollution coming from Europe and natural multi-decade climate variations likely play a role. But human-caused global warming is the underlying reason that the Arctic, and the planet as a whole, are heating up.
“That’s why the temperature trends are the highest [in] those areas where the sea ice has declined most,” explains Rantanen. There are hotspots in the Bering Sea over Northern Europe and Siberia, which are heating up about seven times faster than the global average, the study estimates.
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