Effect of heterogeneity and shape on optical properties of urban dust based on three-dimensional modeling of individual particles.

ABSTRACT: We show the effect of composition heterogeneity and shape on the optical properties of urban dust particles based on the three-dimensional spatial and optical modeling of individual particles. Using scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDX) and focused ion beam (FIB) tomography, spatial models of particles collected in Los Angeles and Seattle accounted for surface features, inclusions, and voids, as well as overall composition and shape. Using voxel data from the spatial models and the discrete dipole approximation method, we report extinction efficiency, asymmetry parameter, and single-scattering albedo (SSA). Test models of the particles involved (1) the particle's actual morphology as a single homogeneous phase and (2) simple geometric shapes (spheres,

SUBMITTER: Conny JM 

PROVIDER: S-EPMC7067280 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature