Year: 2025
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide Global warming has intensified the frequency and severity of heatwave events (HWs); however, the research on the interaction between O 3 and reactive nitrogen during HWs is far from sufficient. In this study, three types covering nine HWs events were identified during summer 2023 (June–August) in Beijing, including daytime HWs (DHWs, 4 days), nighttime HWs (NHWs, 8 nights), and compound HWs (CHWs, 27 days). Twenty-eight days of O 3 pollution (OP) occurred during the whole summer, among which 64% (18 out of 28) appeared during HWs. HWs elevated O 3 concentrations by 27.3% comparing to non-HWs, while CHWs significantly amplified diurnal O 3 fluctuations accompanied by the accumulation of reactive nitrogen (NOx, NOz, and NOy), indicting a stronger tendency toward O 3 -reactive nitrogen combined pollution. During HWs, NOx/NOy ratios were reduced, and secondary oxidized nitrogen NOz levels were elevated, which accelerated photochemical O 3 production and promoted VOC-driven chain reactions, thereby intensifying and prolonging O 3 pollution. O 3 suppression was observed at temperatures of ∼38 °C, indicating a nonlinear and complex influence of HWs on the O 3 formation. This work elucidates synergistic O 3 -reactive nitrogen transformation mechanisms under extreme HWs, providing a scientific foundation for refined regional pollution modeling and precision mitigation strategies.
Language: English
Subfield: Atmospheric Science
Field: Earth and Planetary Sciences
Domain: Physical Sciences
SDG: Climate action
Open Access status: hybrid
Estimated APC paid: $4,500
Awards: G5562870413, G8915358845
OpenAlex ID: W7117536772