Coupled biogenic–soil emissions drive heatwave-amplified secondary pollution. (IMAGE)
Caption
Coupled biogenic–soil emissions drive heatwave-amplified secondary pollution. This graphical abstract illustrates the synergistic mechanism by which extreme heatwaves amplify secondary air pollution. Rising temperatures (heatwave) simultaneously boost emissions of biogenic terpenoids from vegetation and nitric oxide (NO) from soils. Enhanced biogenic terpenoids increase atmospheric oxidation capacity through reactive radical generation, which accelerates the conversion of soil-emitted NO to nitrogen dioxide (NO2) without consuming ozone (O3). This chemical synergy drives a 21% increase in regional O3 and a 64% rise in secondary organic aerosol (SOA) formation during heatwave episodes across the Yangtze River Basin. The warm air distortion and enhanced oxidation capacity collectively worsen air-quality outcomes, demonstrating how coupled natural emissions can offset gains from anthropogenic pollution controls.
Credit
Environmental Science and Ecotechnology
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CC BY-NC-ND