title: Modeling optical properties of particles with small-scale surface roughness: combination of group theory with a perturbation approach.
abstract: A T-matrix method for scattering by particles with small-scale surface roughness is presented. The method combines group theory with a perturbation expansion approach. Group theory is found to reduce CPU-time by 4-6 orders of magnitude. The perturbation expansion extends the range of size parameters by a factor of 5 compared to non-perturbative methods. An application to optically hard particles shows that small-scale surface roughness changes scattering in side- and backscattering directions, and it impacts the single-scattering albedo. This can have important implications for interpreting remote sensing observations, and for the climate impact of mineral aerosols.
authors.affiliation: Swedish Meteorological and Hydrological Institute (SMHI), Research Department, Norrköping, Sweden. michael.kahnert@smhi.se
authors.forename: Michael
authors.initials: M
authors.lastname: Kahnert
authors.forename: Tom
authors.initials: T
authors.lastname: Rother