Journal article
Reduced light absorption of black carbon (BC) and its influence on BC-boundary-layer interactions during "APEC Blue"
ATMOSPHERIC CHEMISTRY AND PHYSICS, Vol.21(14), pp.11405-11421
2021
DOI: 10.5194/acp-21-11405-2021
Abstract
Light absorption and radiative forcing of black carbon (BC) is influenced by both BC itself and its interactions with other aerosol chemical compositions. Although the changes in BC concentrations in response to emission reduction measures have been well documented, the influence of emission reductions on the light absorption properties of BC and its influence on BC-boundary-layer interactions has been less explored. In this study, we used the online coupled WRF-Chem model to examine how emission control measures during the Asia-Pacific Economic Cooperation (APEC) summit affect the mixing state and light absorption of BC, and the associated implications for BC-PBL interactions. We found that both the mass concentration of BC and the BC coating materials declined during the APEC week, which reduced the light absorption and light absorption enhancement (E-ab) of BC. The reduced absorption aerosol optical depth (AAOD) during APEC was caused by both the decline in the mass concentration of BC itself (52.O %), and the lensing effect of BC (48.O %). The reduction in coating materials (39.4 %) contributed the most to the influence of the lensing effect, and the reduced light absorption capability (E-ab) contributed 3.2 % to the total reduction in AAOD. Reduced light absorption of BC due to emission control during APEC enhanced planetary boundary layer height (PBLH) by 8.2 m. PM2.5 and O-3 were found to have different responses to the changes in the light absorption of BC. Reduced light absorption of BC due to emission reductions decreased nearsurface PM2.5 concentrations but near-surface O-3 concentrations were enhanced in the North China Plain. These results suggest that current measures to control SO2, NOx, etc. would be effective in reducing the absorption enhancement of BC and in inhibiting the feedback of BC on the boundary layer. However, enhanced ground O-3 might be a side effect of current emission control strategies. How to control emissions to offset this side effect of current emission control measures on O-3 should be an area of further focus.
Details
- Title: Subtitle
- Reduced light absorption of black carbon (BC) and its influence on BC-boundary-layer interactions during "APEC Blue"
- Creators
- Meng Gao - Hong Kong Baptist UniversityYang Yang - Nanjing UniversityHong Liao - Nanjing UniversityBin Zhu - Nanjing University of Information Science and TechnologyYuxuan Zhang - Nanjing UniversityZirui Liu - Chinese Academy of SciencesXiao Lu - Sun Yat-sen UniversityChen Wang - Department of Chemical and Biochemical Engineering, The University of#N#Iowa, Iowa City, IA 52242, USAQiming Zhou - Hong Kong Baptist UniversityYuesi Wang - Chinese Academy of SciencesQiang Zhang - Tsinghua UniversityGregory R Carmichael - Department of Chemical and Biochemical Engineering, The University of#N#Iowa, Iowa City, IA 52242, USAJianlin Hu - Nanjing University
- Resource Type
- Journal article
- Publication Details
- ATMOSPHERIC CHEMISTRY AND PHYSICS, Vol.21(14), pp.11405-11421
- DOI
- 10.5194/acp-21-11405-2021
- ISSN
- 1680-7324
- Grant note
- DOI: 10.13039/501100001809, name: National Natural Science Foundation of China, award: 92044302, 42005084; DOI: 10.13039/501100012166, name: National Key Research and Development Program of China, award: 2016YFA0602003; DOI: 10.13039/501100002855, name: Ministry of Science and Technology of the People's Republic of China, award: 2017YFC0210000; DOI: 10.13039/501100003453, name: Natural Science Foundation of Guangdong Province, award: 2019A1515011633; DOI: 10.13039/501100011282, name: State Key Joint Laboratory of Environmental Simulation and Pollution Control, award: 19K03ESPCT; DOI: 10.13039/501100011404, name: Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, award: KHK1902
- Language
- English
- Date published
- 2021
- Academic Unit
- Civil and Environmental Engineering; Nursing; Chemical and Biochemical Engineering
- Record Identifier
- 9984231922002771
Metrics
5 Record Views