Heatwaves over Europe have increased three to four times faster than in the rest of the northern mid-latitudes like e.g. the US or Canada, a new study finds. An international team of scientists looked at observational data from the past 40 years and showed, for the first time, that this rapid increase is linked to changes in the atmospheric circulation. Large-scale winds at 5 to 10km height, the so-called jet stream, are changing over Eurasia. Periods during which the jet stream is split into two branches – so called double jet states – have become longer lasting. These double jet states explain almost all of the upward trend in heatwaves in western Europe, and around 30 percent over the larger European domain.
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