资源环境科技发展态势分析平台

We apply an online‐coupled meteorology‐chemistry model (WRF‐Chem) embedded with an improved process analysis to examine aerosol‐radiation feedback (ARF) impacts on effectiveness of emission control due to COVID‐19 lockdown over North China Plain. Emission reduction alone induces PM_2.5 decrease by 16.3 μg m^‐3 and O₃ increase by 10.2 ppbv during COVID‐19 lockdown. The ARF enhances PM_2.5 decrease by 2.7 μg m^‐3 (16.6%) and O₃ increase by 0.8 ppbv (7.8%). The ARF‐induced enhancement of PM_2.5 decline is mostly attributed to aerosol chemistry process, while enhancement of O₃ rise is ascribed to physical advection and vertical mixing processes. A set of sensitivity experiments with emission reductions in different degrees indicate that the ARF‐induced enhancements of PM_2.5 declines (O₃ rises) follow a robust linear relationship with the emission‐reduction‐induced PM_2.5 decreases. The fitted relationship has an important implication for assessing the effectiveness of emission abatement at any extent.