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- W2738302563 abstract "An idealized spherical model with black carbon (BC) aggregates fully coated by sulfate is developed to study the absorption enhancement (Eab) of polydisperse BC aerosols, which is numerically calculated by the multiple-sphere T-matrix method (MSTM). The aim of this study is to evaluate the effects of aerosol microphysics on the absorption enhancement of fully coated BC particles. The Eab values of accumulation concentric coated BC aggregates with different BC fractal dimensions vary within 2%, while those of coarse coated BC aggregates can alter up to 20% depending on shell-core ratio Dp/Dc (spherical equivalent particle diameter divided by BC core diameter). The BC position inside coating can result in an Eab decrease of fully coated BC aggregates up to approximately 15% and 20% in the accumulation and coarse modes, respectively. Compared with the concentric spherical structure, the off-center coated BC aggregates shows similar Eab with a difference less than 9% in the accumulation mode, whereas it can lead to up to 31% reductions in Eab in the coarse mode. The absorption enhancement of aged BC is sensitive to particle size distribution, and it decreases as particles becomes larger in accumulation mode, whereas the reverse is true in coarse mode. For BC aggregates fully coated with a very thin layer sulfate at different size distributions, Eab values are generally in ranges of 1.5–1.8 and 1.3–1.4 in accumulation and coarse modes, respectively, while with coating reaching Dp/Dc = 2.7, their values range from 1.7–2.4 and 2.0–2.1 in accumulation and coarse modes, respectively. Our study indicates that, larger Dp/Dc with BC aggregates not close to the coating boundary, or BC position closer to particle geometric center enhance BC lensing effect, whereas BC aggregates near the boundary of heavy coating may not further enhance lensing effect significantly with increased coating fraction." @default.
- W2738302563 created "2017-07-31" @default.
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- W2738302563 creator A5033732336 @default.
- W2738302563 creator A5053533157 @default.
- W2738302563 creator A5090318355 @default.
- W2738302563 date "2017-11-01" @default.
- W2738302563 modified "2023-10-18" @default.
- W2738302563 title "Absorption enhancement of aged black carbon aerosols affected by their microphysics: A numerical investigation" @default.
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- W2738302563 doi "https://doi.org/10.1016/j.jqsrt.2017.07.025" @default.
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