Models for integrated and differential scattering optical properties of encapsulated light absorbing carbon aggregates
Journal article, 2013
Optical properties of light absorbing carbon (LAC) aggregates encapsulated in a shell of sulfate are computed for realistic model geometries based on field measurements. Computations are performed for wavelengths from the UV-C to the mid-IR. Both climate- and remote sensing-relevant optical properties are considered. The results are compared to commonly used simplified model geometries, none of which gives a realistic representation of the distribution of the LAC mass within the host material and, as a consequence, fail to predict the optical properties accurately. A new core-gray shell model is introduced, which accurately reproduces the size- and wavelength dependence of the integrated and differential optical properties.
p577
t-matrix
morphology
wavelength
absorption
black carbon
electromagnetic scattering
v430
aerosol-particles
ang h
1990
proceedings of the royal society-mathematical and physical sciences
discrete-dipole approximation
in-situ
soot
Author
Michael Kahnert
Chalmers, Earth and Space Sciences, Global Environmental Measurements and Modelling
T. Nousiainen
University of Helsinki
H. Lindqvist
University of Helsinki
Optics Express
1094-4087 (ISSN) 10944087 (eISSN)
Vol. 21 7 7974-7993Aerosol Optics in Global Earth System Modelling (AGES)
Swedish Research Council (VR) (2011-3346), 2011-10-26 -- 2014-10-26.
Subject Categories
Physical Sciences
DOI
10.1364/OE.21.007974