Beispielloser Anstieg von Hitzerekorden und Extremregen in Beobachtungsdaten — Potsdam-Institut für Klimafolgenforschunghttps://www.pik-potsdam.de/de/aktuelles/nachrichten/beispielloser-anstieg-von-hitzerekorden-und-extremregen-in-beobachtungsdaten?set_language=deThe frequency of monthly heat records has increased 90-fold over the past decade, compared to 1951-1980. Researchers have found this in observational data. The monthly so-called 3-sigma events - heat waves that differ greatly from what is normal in a certain region - now affect an average of around 9 percent of the total land area. Rain extremes have also increased; On average, one in four record-high daily rainfall over the past decade can be attributed to climate change. The researchers explain that extreme events associated with man-made climate change are already at an unprecedented level. And they expect a further increase
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"The change in extreme events, which we refer to as 4-sigma events, and which were practically non-existent before - we even see an increase of 1000 times compared to the reference period is even greater. They affected 2011-20 in about 3 percent of the global land area every month, "says lead author Alexander Robinson from Complutense University Madrid and the Potsdam Institute for Climate Impact Research. "This confirms previous results, albeit with ever increasing numbers. We are now experiencing extremes that would be virtually impossible without the influence of man-made global warming." The term 'sigma' refers to what researchers call a standard deviation.
For example, 2020 saw prolonged heat waves in both Siberia and Australia, which led to devastating forest fires in both regions. Both events led to a local emergency being declared. In 2021, the temperatures in parts of the USA and Canada reached almost 50 ° C, life-threatening. Globally, record heat extremes increased the most in the tropical regions, as the tropics usually have little variability in monthly temperatures. Where the range of fluctuation is normally small, even comparatively small shifts can lead to records
Increasing heat and rainfall extremes now far outside the historical climate | npj Climate and Atmospheric Sciencehttps://www.nature.com/articles/s41612-021-00202-w