10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Fractal Morphology of Black Carbon Aerosol Enhances Absorption on the Thermal Infrared Wavelengths
WILLIAM HEINSON, Rajan K. Chakrabarty, Washington University in St. Louis
Abstract Number: 997 Working Group: Carbonaceous Aerosol
Abstract We numerically calculate the mass absorption cross sections (MACs) of black carbon fractal aggregates in the thermal infrared solar spectrum. Compared to equivalent-size spheres, the MAC values of aggregates show a percent enhancement of ≈150 and 400 at small and large length scales, respectively. The absorption properties of aggregates with size parameters >1 surprisingly continued to remain in the Rayleigh optics regime. We explain this phenomenon using the Maxwell–Garnett effective medium theory and the concept of phase shift parameter.