# Three-Way Feedback Loop Amplifies Global Heatwaves New research reveals soil-atmosphere interactions make extreme heat events significantly hotter than predicted. - **Source:** [New Scientist](https://www.newscientist.com/) - **Published:** 2026-11-06 - **Topic:** [science](https://brifing.si/c/science) - **Original article:** - **On Brifing:** https://brifing.si/s/05944e6a-f98a-479f-955c-0e0930f6cac1 ## Unforeseen Heatwave Amplification Recent research identifies a three-way feedback loop between dry soil, high-pressure systems, and extreme heat. This mechanism causes heatwaves to reach intensities that significantly exceed historical records and current climate model projections. Scientists are now investigating why these extreme weather events are occurring with such surprising frequency and severity globally. ## The Soil-Atmosphere Connection High-pressure systems increase solar radiation reaching the Earth, which subsequently dries out the soil. This process removes the natural cooling effect of evaporation, further heating the land. Crucially, researchers found that this parched soil can then sustain the high-pressure systems themselves, creating a self-reinforcing cycle of rising temperatures. ## Quantifying the Heat Increase This newly identified feedback effect makes extreme heatwaves approximately 10 percent hotter than they would be otherwise. Kai Kornhuber, a researcher at the International Institute for Applied Systems Analysis, notes that this 10 percent margin is often the critical difference between a standard heatwave and a record-shattering, dangerous weather event. ## Model Projection Deficiencies Current climate models are failing to fully account for this specific feedback mechanism, leading to underestimations of future heat extremes. Experts like Dim Coumou from the Free University of Amsterdam emphasize that this gap in modeling is a significant concern, as it hinders our ability to accurately predict future temperature thresholds. ## Vulnerable Global Regions As global temperatures rise, regions such as Europe, Russia, North America, parts of South America, and Australia are increasingly susceptible to this feedback loop. These areas will likely hit critical thresholds more frequently, making the intensity of future heatwaves a major challenge for both social and biophysical systems worldwide. ## Societal and Infrastructure Risks The intensification of heatwaves poses severe risks to essential infrastructure, including energy grids and transport networks. Beyond technical failures, the phenomenon threatens public health and agricultural stability, potentially leading to widespread crop failures. These cascading effects highlight the urgent need for better preparedness against the escalating threat of extreme heat. ## Urgent Need for Adaptation Governments must urgently prioritize preparations for more intense heat events in the coming decades. Experts suggest that regions like Europe, which have already experienced record-breaking temperatures exceeding 40°C, need to adapt their infrastructure and public health policies to manage the increased frequency of these dangerous, feedback-driven heatwave conditions. ## Future Research Directions The scientific community is now focused on integrating this feedback mechanism into climate models to improve future projections. By refining these tools, researchers hope to better understand the biophysical thresholds that lead to damaging heat extremes, ultimately providing policymakers with the data necessary to mitigate the impacts of a warming planet. ## Sources covering this story - https://www.newscientist.com/article/2597676-an-unexpected-feedback-loop-may-be-driving-mega-heatwaves/?utm_campaign=RSS|NSNS&utm_content=home&utm_medium=RSS&utm_source=NSNS — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._