Extreme Heat Becoming More Frequent and Intense, UN Agency Says
Researchers found hourly extreme heat is rising across most of the world, with low- and middle-income countries facing more than three-quarters of current and projected exposure.
- Researchers from China's Sun Yat-sen University and Southern Marine Science and Engineering Guangdong Laboratory projected that hot days could gain four hours of extreme heat by the end of the 21st century under high-emissions scenarios.
- Hourly assessments reveal significant heat exposure often missed by traditional daily metrics. An hourly heat event was defined as temperature exceeding 90 per cent of previous measurements during the 1981-2010 baseline.
- "Each hot day will gain about four hot hours, and a further three hot hours will occur on non-hot days, which daily metrics overlook," researchers wrote. More than 80 per cent of land area showed increased heat.
- Low and middle-income countries will likely bear the brunt of increased heat exposure, accounting for more than three-quarters of current and projected events while facing the largest increases in lifetime exposure.
- Improved understanding of hourly heat events is vital for early warning systems and climate adaptation strategies, as findings published in Nature Climate Change suggest hourly assessments support more effective public health planning.
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51 Articles
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Extreme heat continues to become more frequent and intense, UN agency says
GENEVA — Periods of extreme heat are becoming more frequent, intense and longer-lasting as climate change warms the planet, the U.N. weather agency said Tuesday, noting changes since the famously hot European summer of 1976.
UN agency says extreme heat becoming more frequent, intense
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