Investigating fire-induced ozone production from local to global scales

作者：Joseph Palmo, Colette L. Heald, D. R. Blake, Ilann Bourgeois, Matthew M. Coggon, Jeffrey L. Collett, F. Flocke, Alan Fried, Georgios I. Gkatzelis, Samuel R. Hall, Lu Hu, J. L. Jiménez, Pedro Campuzano‐Jost, I‐Ting Ku, Benjamin A. Nault, Brett B. Palm, Jeff Peischl, I. B. Pollack, Amy P. Sullivan, Joel A. Thornton, Carsten Warneke, Armin Wisthaler, Lu Xu · 发表于：Atmospheric chemistry and physics · 年份：2025 · DOI：10.5194/acp-25-17107-2025 · 被引用次数：3 · 研究领域：Atmospheric chemistry and aerosols、Plant responses to elevated CO2、Atmospheric aerosols and clouds

Abstract. Tropospheric ozone (O3) production from wildfires is highly uncertain; previous studies have identified both production and loss of O3 in fire-influenced air masses. To capture the total ozone production attributable to a smoke plume, we bridge the gap between near-field fire plume chemistry and aged smoke in the remote troposphere. Using airborne measurements from several major campaigns, we find that fire-ozone production increases with age, with a regime transition from NOx-saturated to NOx-limited conditions, showing that O3 production in well-aged plumes is largely controlled by nitrogen oxides (NOx). Observations in fresh smoke demonstrate that suppressed photochemistry reduces O3 production by ∼ 70 % in units of ppb Ox (O3 + NO2) per ppm CO in the near-field (age < 20 h). We demonstrate that anthropogenic NOx injection into VOC-rich fire plumes drives additional O3 production, sometimes exceeding 50 ppb above background. Using a box model, we explore the evolving sensitivity of O3 production to fire emissions and chemical parameters. We demonstrate the importance of aerosol-induced photochemical suppression over heterogeneous HO2 uptake, validate HONO's importance as an oxidant precursor, and confirm evolving NOx sensitivity. We evaluate GEOS-Chem's performance against these observations, finding the model captures fire-induced O3 enhancements at older ages but overestimates near-field enhancements, fails to capture the magnitude and variability of fire em...