Numerical quantitation on the effect of coating materials on the mixing state retrieval accuracy of fractal black carbon based on single particle soot photometer

Liu, Jia; Zhou, Donghui; Wang, Guangya; Zhu, Cancan; Zhang, Xuehai

doi:https://doi.org/10.5194/amt-18-4045-2025

Articles | Volume 18, issue 16

https://doi.org/10.5194/amt-18-4045-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/amt-18-4045-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 18, issue 16

Research article

|

28 Aug 2025

Research article |

| 28 Aug 2025

Numerical quantitation on the effect of coating materials on the mixing state retrieval accuracy of fractal black carbon based on single particle soot photometer

Jia Liu, Donghui Zhou, Guangya Wang, Cancan Zhu, and Xuehai Zhang

Data sets

DpDc retrieval of soot with different coatings using SP2 Jia Liu et al. https://doi.org/10.13140/RG.2.2.10735.14249

Model code and software

The multiple-sphere T-matrix code D. W. Mackowski and M. I. Mishchenko https://github.com/dmckwski/MSTM

Short summary

Single-particle soot photometer (SP2) measures the mixing state (D_p/D_c) of coated black carbon (BC) using core-shell Mie theory and coating refractive index is set to 1.50+0i. The retrieved D_p/D_c contains error due to the non-sphericity of BC and coatings with various refractive indices. We reveal the remarkable effects of coatings on the D_p/D_c retrieval accuracy of SP2 based on optical simulation of fractal BC aerosols, and further evaluate the simple radiative forcing efficiency of coated BC.