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Simplifying the calculation of light scattering properties for black carbon fractal aggregates

Atmospheric Chemistry and Physics European Geosciences Union (2014)

Authors:

AJA Smith, RG Grainger

Abstract:

Abstract. Black carbon fractal aggregates have complicated shapes that make the calculation of their optical properties particularly computationally expensive. Here, a method is presented to estimate fractal aggregate light scattering properties by optimising simplified models to full light scattering calculations. It is found that there are no possible spherical models (at any size or refractive index) that well represent the light scattering in the visible, or near-thermal infrared. As such, parameterisations of the light scattering as a function of the number of aggregate particles is presented as the most pragmatic choice for modelling distributions of black carbon when the large computational overheads of rigorous scattering calculations cannot be justified. This parameterisation can be analytically integrated to provide light scattering properties for log-normal distributions of black carbon fractal aggregates and return extinction cross-sections with 0.1% accuracy for typical black carbon size distributions. Scattering cross-sections and the asymmetry parameter can be obtained to within 3%.
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Simplifying the calculation of light scattering properties for black carbon fractal aggregates

Atmospheric Chemistry and Physics Copernicus Publications 14:15 (2014) 7825-7836

Authors:

AJA Smith, RG Grainger
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Simultaneous retrieval of volcanic sulphur dioxide and plume height from hyperspectral data using artificial neural networks

Geophysical Journal International Oxford University Press (OUP) 198:2 (2014) 697-709

Authors:

Alessandro Piscini, Elisa Carboni, Fabio Del Frate, Roy Gordon Grainger
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A Neural Network Approach for Simultaneous Retrieval of Volcanic SO2 and Plume Height Using Hyperspectral Measurements

Institute of Electrical and Electronics Engineers (IEEE) (2014) 1-4

Authors:

A Piscini, E Carboni, F Del Frate, RG Grainger
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A study on the sensitivities of simulated aerosol optical properties to composition and size distribution using airborne measurements

Atmospheric Environment Elsevier 89 (2014) 517-524

Authors:

AR Esteve, EJ Highwood, WT Morgan, G Allen, H Coe, RG Grainger, P Brown, K Szpek
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