Articles | Volume 18, issue 23
https://doi.org/10.5194/acp-18-16897-2018
https://doi.org/10.5194/acp-18-16897-2018
Research article
 | 
29 Nov 2018
Research article |  | 29 Nov 2018

Effects of brown coatings on the absorption enhancement of black carbon: a numerical investigation

Jie Luo, Yongming Zhang, Feng Wang, and Qixing Zhang

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Adachi, K. and Buseck, P. R.: Internally mixed soot, sulfates, and organic matter in aerosol particles from Mexico City, Atmos. Chem. Phys., 8, 6469–6481, https://doi.org/10.5194/acp-8-6469-2008, 2008. a
Adachi, K., Chung, S. H., and Buseck, P. R.: Shapes of soot aerosol particles and implications for their effects on climate, J. Geophys. Res.-Atmos., 115, D15206, https://doi.org/10.1029/2009JD012868, 2010. a, b, c
Alexander, D. T. L., Crozier, P. A., and Anderson, J. R.: Brown carbon spheres in East Asian outflow and their optical properties, Science, 321, 833–836, 2008. a, b
Andreae, M. O. and Gelencsér, A.: Black carbon or brown carbon? The nature of light-absorbing carbonaceous aerosols, Atmos. Chem. Phys., 6, 3131–3148, https://doi.org/10.5194/acp-6-3131-2006, 2006. a
Bergstrom, R. W.: Predictions of the spectral absorption and extinction coefficients of an urban air pollution aerosol model, Atmos. Environ., 6, 247–258, https://doi.org/10.1016/0004-6981(72)90083-2, 1972. a
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The absorption enhancement of black carbon with brown coatings is investigated. In addition, the ratio of the absorption of BC coated by brown carbon (BrC) to an external mixture of BrC and BC (Eabs_internal) is also investigated. The lensing effect and sunglasses effect are clearly defined. The applicability of the core–shell sphere model was investigated. The effects of the size distribution, fractal dimension, and wavelength dependency are also explored.
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