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Threefold increase in atmospheric-riverine compound heatwaves under climate change
Yu Zhou1,2, Yanxia Shen1,2, Wei Zhi1,2
1State Key Laboratory of Water Disaster Prevention, Yangtze Institute for Conservation and Development, Hohai University, Nanjing, China.
Nature Geoscience
|August 8, 2026
Summary
Compound heatwaves, combining atmospheric and river events, have tripled in frequency since the 1980s. These events significantly impact water quality and freshwater ecosystems, demanding updated risk assessments.
Area of Science:
- Environmental Science
- Hydrology
- Climate Science
Background:
- Record heatwaves increasingly disrupt global systems.
- The co-occurrence of atmospheric and riverine heatwaves is understudied.
- Understanding compound heatwaves is crucial for water resource management.
Purpose of the Study:
- To analyze the frequency and trends of atmospheric-riverine compound heatwaves.
- To identify factors controlling compound heatwave occurrences.
- To assess the impact of compound heatwaves on water temperature and dissolved oxygen.
Main Methods:
- Analysis of 796 river basins in the USA and Central Europe.
- Integration of water quality observations with a deep learning model.
- Comparison of heatwave trends between 1981-1990 and 2010-2019.
Main Results:
- Compound heatwaves have tripled in frequency over the past four decades.
- Riverine heatwaves intensified significantly, outpacing atmospheric heatwaves.
- Compound heatwaves increase water temperature by 16% and decrease dissolved oxygen by 2.9%.
Conclusions:
- Compound heatwaves pose escalating threats to freshwater ecosystems.
- Climatic, topographic, and hydrological factors influence compound heatwave trends.
- Future water risk assessments must incorporate compound heatwave dynamics, especially under high-emission scenarios.
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