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Models for integrated and differential scattering optical properties of encapsulated light absorbing carbon aggregates

Michael Kahnert (Institutionen för rymd- och geovetenskap, Global miljömätteknik och modellering) ; T. Nousiainen ; H. Lindqvist
Optics Express (1094-4087). Vol. 21 (2013), 7, p. 7974-7993.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: discrete-dipole approximation, electromagnetic scattering, aerosol-particles, black carbon, t-matrix, in-situ, soot, absorption, wavelength, morphology, ang h, 1990, proceedings of the royal society-mathematical and physical sciences, v430, p577



Denna post skapades 2013-05-27. Senast ändrad 2014-02-03.
CPL Pubid: 177418

 

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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Global miljömätteknik och modellering (2010-2017)

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Projekt

Denna publikation är ett resultat av följande projekt:


Aerosol Optics in Global Earth System Modelling (AGES) (VR//2011-3346)