Sommerliches Blockadewetter, wie wir es gerade auf der Nordhalbkugel erleben, kann zu „extremen Extremen“ werden – von Hitze zu Dürre, von Regen zu Überschwemmungen, wie eine neue Studie in Nature Communications zeigt.
Auch die Gefahr von Waldbränden kann durch solche ungewöhnlich lang anhaltenden Wetterbedingungen erhöht werden, wie eine Fallstudie in Nature Scientific Reports am Beispiel der Feuersbrunst 2016 in Kanada zeigt.
Riesige Luftströme in der Atmosphäre, so genannte planetare Wellen, können Wetterblockaden entstehen lassen. Beide Studien zeigen, dass die vom Menschen verursachte globale Erwärmung diese großen Zirkulationsmuster bereits beeinflussen könnte, und dass sich damit die Risiken wohl erhöhen.
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