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A criterion for evaluation of the validity of black carbon refractive index from measurements of light absorption in the visible and near-infrared

Par Conseil national de recherches du Canada

DOITrouver le DOI : https://doi.org/10.1615/RAD-19.60
AuteurRechercher : 1; Rechercher : ; Rechercher : ; Rechercher : 1; Rechercher : 1; Rechercher : 1
Affiliation
  1. Conseil national de recherches du Canada. Centre de recherche en métrologie
FormatTexte, Article
ConférenceThe 9th International Symposium on Radiative Transfer, RAD-19, June 3-7, 2019, Athens, Greece
Résumé
The fractal-like black carbon particles emitted from combustion systems and biomass burning are short-lived pollutants that contribute significantly to climate forcing. To accurately quantify the forcing and interpret optical measurements of uncoated and coated black carbon (BC) particles, it is indispensable to know the refractive index m = n + ki of BC in the visible and near infrared. In this study the effects of various morphological parameters and structure defects of black carbon particles on their mass absorption cross section (MAC) were first investigated using the generalized Mie-solution method (GMM) and discrete dipole approximation (DDA). The accuracy of the Rayleigh-Debye-Gans (RDG) approximation is also evaluated. Based on recent measurements of the soot absorption function E(m) and freshly emitted BC MAC in the visible and near-infrared, the most probable range of E(m) was recommended. A criterion was proposed to determine the valid range of refractive index of freshly emitted BC based on the contour plot of E(m) on the n-k plane.
Date de publication
Maison d’éditionBegellhouse
Dans
  • Proceeding of Proceedings of the 9th International Symposium on Radiative Transfer, RAD-19 : 41–48.
Langueanglais
Publications évaluées par des pairsOui
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Identificateur de l’enregistremente936fa39-83f0-4498-a0ad-c0ad5663a555
Enregistrement créé2020-11-09
Enregistrement modifié2021-09-17
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