2018 N. Hemisphere Heatwave Hit 17 Countries, Would Not Have Been Possible w/o Human-Induced Warming
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The new study, expected to be published soon, analyzed climate data from 1958 to 2018, and measured the geographic extent of the 2018 heat waves, which affected 17 countries, from the Scandinavian Arctic across the wheat belts of France and Germany, to densely populated cities in North America and Asia. "We found that it could not have occurred without human-induced climate change," Vogel said at the annual European Geosciences Union meeting in Vienna this week. None of the climate models could simulate such a widespread series of linked heat waves without including heat-trapping pollution in the calculations, she said.
From May to July, the heat waves affected 22 percent of the agricultural land and populated areas in the mid-latitudes of the Northern Hemisphere, from Canada and the United States to Russia, Japan and South Korea, killing hundreds of people, devastating crops and curtailing power production.
The hemisphere experienced similar large-scale, deadly heat waves in 2012 and 2010, but the scientists did not find evidence of such large areas being affected simultaneously by heat before 2010. They calculated that, for every degree Celsius of global warming, the area of the Northern Hemisphere affected by extreme heat will grow 16 percent.
A separate attribution study of the 2018 heat wave in Europe concluded that global warming made the event twice as likely as it would have been in a climate unaltered by humans. The 2017 European heat wave, dubbed Lucifer, was made 10 times more likely by global warming, another attribution study determined. Last year, the top European science panel documented a big surge in extreme weather events of all kinds in Europe.
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https://insideclimatenews.org/news/11042019/2018-heat-wave-climate-change-attribution-northern-hemisphere-extreme-weather-record
