#AceNewsReport – July.03: Their rapid attribution study says that rising temperatures “super-charged globally, the average temperature for June was the highest on record: Heatwaves naturally occur in summertime but last week’s event in many European countries was unprecedented because it happened so early, and the recorded temperatures were so high: Records were broken at locations in France, Switzerland, Austria, Germany and Spain: The new French record, established at Gallargues-le-Montueux last Friday, was more than 1.5C above the previous high mark: Much of the concern about the heat focused on France, with red alerts in several areas, many schools were closed, exams were postponed and health minister Agnès Buzyn warned that “everyone is at risk” …………….The immediate cause of the heatwave was the weather, with hot air drawn in from northern Africa, caused by high pressure over central Europe and a storm stalling over the Atlantic.
By lucky coincidence, the authors of this new study happened to be in Toulouse, France, at a conference on climate change and extreme events: The researchers, members of the World Weather Attribution Group decided to use the opportunity to analyse the link between human-induced climate change and the heatwave.
They defined the heatwave as the highest three-day averaged daily mean temperature in June, arguing that this is a better indicator of health impacts than maximums or minimums: The researchers compared the observations of temperatures recorded during the month of June with climate models that can show how the world would be without the human influence on the climate.
They found that, over France, the probability of having a heatwave had increased by at least a factor of five: However, the researchers say that this influence could be much higher still, by a factor of 100 or more.
“We are very confident that this lower boundary of factor five is valid – but we are not confident we can say much more than that,” said Dr Geert Jan van Oldenborgh, senior researcher at the Royal Netherlands Meteorological Institute: “The reason we are fairly careful is because we found fairly large discrepancies between the modelled properties of heatwaves and the observed properties of heatwaves: They all show stronger heatwaves but the trend in the observations is much larger than in the trends in the model.”
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