New Study Reveals Self-Reinforcing Dynamics Intensifying Extreme Heatwaves in U.S. and Globally
A new study published in Science Advances, led by the Potsdam Institute for Climate Impact Research (PIK) and the International Institute for Applied Systems Analysis (IIASA), has identified a previously misunderstood self-reinforcing interaction that makes extreme heatwaves 10 percent hotter. This interaction involves temperature, soil moisture, and atmospheric pressure. Researchers used machine learning and statistical analysis to discover that in mid-latitude regions, including parts of North America, these three factors begin to interact and drive each other further once a certain temperature threshold is reached. This phenomenon contributes to 'mega heatwaves' that have significantly surpassed previous temperature records. For instance, the 2021 summer heatwave in the U.S. Pacific Northwest saw temperatures reach 4.6°C above prior records. The study explains that high-pressure systems increase solar radiation, while rising temperatures dry out soils, reducing evaporative cooling. These two-way relatio...
