Journal
OPTICS EXPRESS
Volume 25, Issue 20, Pages 24579-24593Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.024579
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Funding
- Swedish Research Council (Vetenskapsradet) [2016-03499]
- Vinnova [2016-03499] Funding Source: Vinnova
- Swedish Research Council [2016-03499] Funding Source: Swedish Research Council
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At 532 nm wavelength, optical properties of black carbon ( BC) particles mixed with sulfate are computed by use of two morphological models, a closed cell and a coated aggregate model. For high BC volume fractions f, both models yield comparable results. As more sulfate is added, some of the optical properties diverge. The backscattering depolarization ratio delta(L) is particularly sensitive to the morphology. Comparison with field measurements suggests that the closed cell model underestimates dL; the coated aggregate model yields good results for intermediate and high values of f, but somewhat too high results for low f. This could be improved by taking the collapse of fractal structure with decreasing f into account. (C) 2017 Optical Society of America
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