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Flash Droughts Accelerate: Heat's Deadly One-Two Punch
7 Mar
Summary
- Heat-first compound extremes are rapidly increasing globally.
- Heat-triggered droughts are more severe and occur suddenly.
- The rate of increase for these extremes has dramatically accelerated since 2000.
Compound extreme weather events, characterized by a combination of heat and drought, are escalating globally due to climate change. A recent study indicates a particularly alarming rise in heat-first extremes, where intense heat precedes and triggers sudden, damaging droughts. These "flash droughts" are more severe and offer little time for adaptation, unlike traditional droughts.
The study highlights that the rate at which these heat-first extremes are spreading has significantly accelerated, increasing eightfold in the last two decades compared to earlier periods. This rapid escalation, with a noticeable "change point" around the year 2000, has led researchers to speculate about Earth possibly crossing an irreversible tipping point.
Regions like the Pacific Northwest, China's Yangtze River basin, and the Amazon have experienced severe heat and drought events. The most pronounced increases in heat-first droughts have been observed in South America, western Canada, Alaska, the western United States, and parts of Africa. Scientists suggest this acceleration may be linked to rapid Arctic warming and sea-ice loss.
