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 Coronavirus Disease 2019 (COVID-19) lockdown over North China Plain. Emission reduction alone induces PM decrease by 16.3 μg m and O increase by 10.2 ppbv during COVID-19 lockdown. The ARF enhances PM decrease by 2.7 μg m (16.6%) and O increase by 0.8 ppbv (7.8%). The ARF-induced enhancement of PM decline is mostly attributed to aerosol chemistry process, while enhancement of O 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 declines (O rises) follow a robust linear relationship with the emission-reduction-induced PM decreases. The fitted relationship has an important implication for assessing the effectiveness of emission abatement at any extent.
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| http://dx.doi.org/10.1029/2020GL090260 | DOI Listing |
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