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• W4234491946 abstract "Abstract. Black carbon (BC) is the dominant absorbing aerosol in the atmosphere, and plays an important role in climate and human health. The optical properties and cloud condensation nuclei (CCN) activity of soot depend on the amounts (both relative and absolute) of BC and nonrefractory material in the particles. Mixing between these two components is often considered using a core/shell coated sphere morphology. The Single Particle Soot Photometer (SP2) is the premier instrument for reporting distributions of both core size and coating thickness. Most studies combine the SP2's incandescence and scattering data to report coating properties, but there is variation in the assumed density and refractive index of the core that are used in these calculations. In this study we explore the sensitivity of the reported coatings to these parameters. An assessment of the coating properties of freshly-emitted, thermodenuded ambient particles demonstrated that a core density of 1.8 g cm−3 and refractive index n = (2.26-1.26i) were the most appropriate to use with ambient soot in the Los Angeles area. Using these parameters generated a distribution of shell/core ratio of 1.04 ± 0.21, corresponding to an absolute coating thickness distribution of 1.7 ± 17.5 nm. This demonstrates that using this technique the SP2 can accurately determine the mixing state (externally or internally mixed) of ambient soot, but with limited precision. Using other core parameters resulted in an offset in the coating distribution, but similar precision. For comparison, using the core parameters that resulted in the thickest coatings (on the same particles as before) generated a distribution of shell/core ratio of 1.40 ± 0.19, corresponding to an absolute coating thickness distribution of 30.3 ± 14.9 nm. Relative changes in coatings associated with secondary aerosol condensation were captured regardless of the assumed core parameters. These results must be taken into account when comparing BC coatings measured using this technique, or if using these data for optical or CCN activity calculations." @default.
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• W4234491946 date "2014-06-05" @default.
• W4234491946 modified "2023-10-12" @default.
• W4234491946 title "Assessment of the sensitivity of core/shell parameters derived using the single-particle soot photometer to density and refractive index" @default.
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• W4234491946 doi "https://doi.org/10.5194/amtd-7-5491-2014" @default.
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