Changes in source-specific black carbon aerosol and the induced radiative effects due to COVID-19 lockdown
Creators
- 1. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
- 2. School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.
- 3. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China.
- 4. Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
- 5. Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
Description
The impacts of anthropogenic emissions on the reduction of source-specific equivalent black carbon (eBC) aerosol and their direct radiative effects (DREs) were investigated during the lockdown of coronavirus outbreak in a megacity of China in 2020. Five eBC sources were identified by a newly developed hybrid environmental receptor model. Results showed that biomass burning, traffic-related emissions, and coal combustion were the dominant contributors to eBC. The generalized addictive model indicated that the reduction of traffic-related eBC during the lockdown was entirely attributed to the decrease of emission. The decreased biomass-burning activities and favorable meteorological factors are both important drivers for the biomass-burning eBC reduction during the lockdown. A radiative transfer model showed that the eBC DRE efficiency of biomass burning was the strongest, followed by coal combustion and traffic-related emissions. This study highlights that aggressive reduction in the consumption of residential solid fuels would be effective on climate change mitigation.
Files
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