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Evidence for preferred propagating terrestrial heatwave pathways due to Rossby wave activity
Mingzhao Wang1,2, Yu Huang3,4, Christian L E Franzke5,6
1Laboratory for Climate and Ocean-Atmosphere Studies, Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, China.
Nature Communications
|May 21, 2025
Summary
Terrestrial heatwaves have preferred pathways across the Northern Hemisphere, moving like Rossby waves. Understanding these heatwave propagation routes can improve prediction of future extreme heat events.
Area of Science:
- Atmospheric Science
- Climatology
- Complex Systems Analysis
Background:
- Terrestrial heatwaves cause significant socioeconomic impacts.
- Predicting heatwaves is difficult due to limited understanding of their spatial evolution and mechanisms.
- Previous studies focused on fixed locations, neglecting heatwave center movement.
Purpose of the Study:
- To investigate the spatial propagation of terrestrial heatwaves.
- To identify preferred heatwave propagation pathways in the Northern Hemisphere.
- To explore the mechanisms driving heatwave movement and their predictability.
Main Methods:
- Utilized a complex network algorithm to analyze heatwave spatial propagation.
- Examined heatwave evolution along identified pathways (propagating or stationary).
- Correlated heatwave pathways with Rossby wave train movements and Rossby wave flux activities.
Main Results:
- Identified four preferred terrestrial heatwave propagation pathways in the Northern Hemisphere.
- Observed heatwaves either propagate along these pathways or remain stationary.
- Found consistency between heatwave pathways and Rossby wave train movements, guided by enhanced Rossby wave flux.
- Detected propagation pathways offer prior knowledge for downstream heatwave occurrences and precursor signal identification.
Conclusions:
- Heatwave propagation is linked to atmospheric wave dynamics, specifically Rossby waves.
- The identified pathways provide insights into heatwave mechanisms.
- This research enhances the potential predictability of terrestrial heatwaves.
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