Heat domes spike in Europe as climate change helps shift weather patterns

9th July, 2022.      //   Climate Change  // 

European heat waves spike as weather patterns shift

A major new study explains why Western Europe has suffered through a series of extreme heat waves that are outpacing even the planet’s overall warming trend.

The study points to stubborn changes in atmospheric circulation for much of the blame. Heat waves are deadly. Increases in their frequency and intensity — already taking place due to global warming — raise these risks.

Specifically, the researchers found that a particular weather pattern, featuring two branches of fast-moving corridors of air across Eurasia, is most closely associated with Western European heat waves. These weather patterns favor weaker upper-level winds over Western Europe, and encourage long-lasting, blocking high-pressure areas, also known as heat domes.

Increasingly persistent double jet stream patterns and their associated heat domes can explain “almost all of the accelerated trend” in heat waves across Western Europe, the study states.

Importantly, the study ties the persistence of particular jet stream patterns and related heat domes to the rapidly warming land temperatures in the Arctic, and the growing contrast between land and ocean temperatures there. Such thermal gradients can influence weather patterns. The research also fits with prior studies of how simultaneous extreme heat events can develop in different parts of the world as climate change worsens.

 The study cautions that there are still uncertainties regarding what is causing the increase in the occurrence and persistence of these particular weather patterns, noting that climate models may not be simulating them accurately.

 “Climate models tend to underestimate extreme weather risks,” said study co-author Kai Kornhuber of Columbia University, in a statement. “Projections of extreme heat under continued greenhouse gas emissions might be too conservative.”

  • Linkedin

  • Pinterest

  • Youtube