Scientists say the heat wave in England and Wales was definitely turbocharged by human-caused climate change
The daily highest temperatures were the most unusual, a one-in-1,000-year event in the current warmer world, but “almost impossible in a world without climate change,” the study said. Last week’s heat smashed the old national record by 1.6 degrees Celsius . The average over two hot days and nights is a once a century event now but is “nearly impossible” without climate change.
When the scientists used the long history of temperatures in England to determine the impact of global warming, they saw a stronger climate change influence than when they used simulations from climate models. For some reason that scientists aren’t quite certain about, climate models have long underestimated extreme weather signals in the summer in Western Europe, Otto said.
With climate models, the scientists simulate a world without the 1.2 degrees Celsius of warming since pre-industrial times and see how likely this heat would have been in that cooler world without fossil fuel-charged warming. With observations they look at history and calculate the chances of such a heat wave that way.
"The methodology seems sound, but candidly, I didn't need a study to tell me this was climate change," said University of Georgia meteorology professor Marshall Shepherd, who wasn't on this study team but was on a U.S. National Academy of Sciences
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