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Optical properties of light absorbing carbon aggregates mixed with sulfate: assessment of different model geometries for climate forcing calculations

Michael Kahnert (Institutionen för rymd- och geovetenskap, Global miljömätteknik och modellering) ; T. Nousiainen ; H. Lindqvist ; M. Ebert
Optics Express (1094-4087). Vol. 20 (2012), 9, p. 10042-10058.
[Artikel, refereegranskad vetenskaplig]

Light scattering by light absorbing carbon (LAC) aggregates encapsulated into sulfate shells is computed by use of the discrete dipole method. Computations are performed for a UV, visible, and IR wavelength, different particle sizes, and volume fractions. Reference computations are compared to three classes of simplified model particles that have been proposed for climate modeling purposes. Neither model matches the reference results sufficiently well. Remarkably, more realistic core-shell geometries fall behind homogeneous mixture models. An extended model based on a core-shell-shell geometry is proposed and tested. Good agreement is found for total optical cross sections and the asymmetry parameter.

Nyckelord: absorption cross-sections, black carbon, aerosol-particles, electromagnetic scattering, radiative properties, t-matrix, soot, spheres, wavelength, algorithms, ang h, 1990, proceedings of the royal society of london series a-mathematical physical



Denna post skapades 2012-07-03. Senast ändrad 2016-08-19.
CPL Pubid: 159952

 

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Projekt

Denna publikation är ett resultat av följande projekt:


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