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DOI10.1016/j.atmosres.2021.105867
Mixing characteristics of black carbon aerosols in a coastal city using the CPMA-SP2 system
Liu H.; Pan X.; Wang D.; Liu X.; Tian Y.; Yao W.; Lei S.; Zhang Y.; Li J.; Lei L.; Xie C.; Fu P.; Sun Y.; Wang Z.
Date Issued2022
ISSN0169-8095
Volume265
Other AbstractThe mixing state of black carbon aerosols (BC) has the largest uncertainty for climate forcing evaluation. In this study, a tandem observation, combining a centrifugal particle mass analyzer (CPMA) and a single particle soot photometer (SP2), was conducted to investigate the mixing state of BC in a coastal city in eastern China. First, particles with specific masses (1.0 fg, 2.1 fg, 4.5 fg, 9.7 fg, and 20.1 fg) were selected using CPMA and consecutively measured by SP2 to determine the corresponding BC mass (MBC) of the particle. The mass ratio (MR) of the coating matter to the BC core was used to indicate the coating thickness and aging degree of BC. The results showed that the MR value obtained from the CPMA-SP2 system was well correlated with the mixing state condition derived from the traditional lag-time method. However, the lag-time method tends to misclassify thickly to thinly coated BC as particles with larger masses. The MR generally increased as the mass of BC-containing particles increased. MR showed a clear diurnal pattern with a minimum at 8:00 and a maximum at 13:00 due to photochemical process during the daytime. The larger BC-containing particles had a much weaker diurnal pattern because other secondary processes may contribute more to the coatings for large BC-containing particles. The MR maintained a high value when the air mass was stagnant in the local area with high pollutant concentrations and high relative humidity (RH), while the MR was at its lowest value when the air mass was derived from the marine area with high RH and low pollutant concentrations. These observations suggest that the increase in MR is the result of the combined effect of high RH and high pollutant concentrations. © 2021 The Authors
enkeywordsBlack carbon; CPMA; Mixing state; SP2
journalAtmospheric Research
Document Type期刊论文
Identifierhttp://gcip.llas.ac.cn/handle/2XKMVOVA/236523
AffiliationState Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Center for Excellence in Regional Atmospheric Environment, Chinese Academy of Science, Xiamen, 361021, China; Institute of Surface-Earth System Science, Tianjin University, Tianjin, 300072, China; School of Geographic Sciences, Xinyang Normal University, Xinyang, 464000, China; State Key Joint Laboratory of Environmental Simulation and Pollution Control, Peking University, Beijing, 100871, China
Recommended Citation
GB/T 7714
Liu H.,Pan X.,Wang D.,et al. Mixing characteristics of black carbon aerosols in a coastal city using the CPMA-SP2 system[J],2022,265.
APA Liu H..,Pan X..,Wang D..,Liu X..,Tian Y..,...&Wang Z..(2022).Mixing characteristics of black carbon aerosols in a coastal city using the CPMA-SP2 system.Atmospheric Research,265.
MLA Liu H.,et al."Mixing characteristics of black carbon aerosols in a coastal city using the CPMA-SP2 system".Atmospheric Research 265(2022).
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