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Secondary inorganic aerosol dominated the light absorption enhancement of black carbon aerosol in Wuhan, Central China
Abstract High uncertainty in simulating the climate effect of black carbon (BC)-containing particles can be raised by an important parameter: light absorption enhancement (E abs), which was impacted by the morphology of BC, its mixing state with coating materials, and the aging process, etc. By a statistical approach called minimum R square (MRS), this study investigated the influence of aerosol chemical compositions on E abs with on-line observational datasets during summer (June 2018) and winter (December 2018) at an urban site in Wuhan, Central China. The E abs at 880 nm (E abs_880) showed a moderate enhancement with a mean value of 1.36 ± 0.35 in summer, which was significantly (p < 0.001) higher than that in winter (1.17 ± 0.24). A proxy defined as the mass ratio of non-refractory chemical components to BC (R BC) was used to link the thickness of BC-containing particles and aerosol chemical compositions with E abs. With the increase of R BC from 16.4 to 51.3 in summer and from 18.3 to 53.3 in winter, E abs_880 values amplified by 15.3% and 38.3%, respectively. The statistical and sensitivity analysis indicated that secondary inorganic aerosols (SIA) contributed most to E abs_880 during summer (92.6%) and winter (71.2%) in Wuhan. Given the dominant mass percentages of SIA in particle chemical compositions and their important role to E abs, reducing their precursors would benefit to alleviate the particle pollution and the warming effect of BC synergistically. The comparison of E abs with previous studies suggested that despite the MRS method in this study had some limitations, this method can be widely used in other regions with similar datasets.
Highlights A statistical method was used to determine light absorption enhancement of BC. Secondary inorganic aerosols contribute most to light absorption enhancement of BC in Wuhan. Reduction of secondary inorganic aerosol is more effective to reduce light absorption enhancement of BC.
Secondary inorganic aerosol dominated the light absorption enhancement of black carbon aerosol in Wuhan, Central China
Abstract High uncertainty in simulating the climate effect of black carbon (BC)-containing particles can be raised by an important parameter: light absorption enhancement (E abs), which was impacted by the morphology of BC, its mixing state with coating materials, and the aging process, etc. By a statistical approach called minimum R square (MRS), this study investigated the influence of aerosol chemical compositions on E abs with on-line observational datasets during summer (June 2018) and winter (December 2018) at an urban site in Wuhan, Central China. The E abs at 880 nm (E abs_880) showed a moderate enhancement with a mean value of 1.36 ± 0.35 in summer, which was significantly (p < 0.001) higher than that in winter (1.17 ± 0.24). A proxy defined as the mass ratio of non-refractory chemical components to BC (R BC) was used to link the thickness of BC-containing particles and aerosol chemical compositions with E abs. With the increase of R BC from 16.4 to 51.3 in summer and from 18.3 to 53.3 in winter, E abs_880 values amplified by 15.3% and 38.3%, respectively. The statistical and sensitivity analysis indicated that secondary inorganic aerosols (SIA) contributed most to E abs_880 during summer (92.6%) and winter (71.2%) in Wuhan. Given the dominant mass percentages of SIA in particle chemical compositions and their important role to E abs, reducing their precursors would benefit to alleviate the particle pollution and the warming effect of BC synergistically. The comparison of E abs with previous studies suggested that despite the MRS method in this study had some limitations, this method can be widely used in other regions with similar datasets.
Highlights A statistical method was used to determine light absorption enhancement of BC. Secondary inorganic aerosols contribute most to light absorption enhancement of BC in Wuhan. Reduction of secondary inorganic aerosol is more effective to reduce light absorption enhancement of BC.
Secondary inorganic aerosol dominated the light absorption enhancement of black carbon aerosol in Wuhan, Central China
Zheng, Huang (author) / Kong, Shaofei (author) / Chen, Nan (author) / Wu, Cheng (author)
Atmospheric Environment ; 287
2022-07-10
Article (Journal)
Electronic Resource
English