A CRITERION FOR EVALUATION OF THE VALIDITY OF BLACK CARBON REFRACTIVE INDEX FROM MEASUREMENTS OF LIGHT ABSORPTION IN THE VISIBLE AND NEAR-INFRARED

Abstract : 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.
Type de document :
Communication dans un congrès
Liste complète des métadonnées

https://hal-normandie-univ.archives-ouvertes.fr/hal-02288121
Contributeur : Jérôme Yon <>
Soumis le : vendredi 25 octobre 2019 - 09:30:18
Dernière modification le : samedi 26 octobre 2019 - 01:57:23

Identifiants

  • HAL Id : hal-02288121, version 1

Citation

Fengshan Liu, Jérôme Yon, Andres Fuentes, Joel Corbin, Prem Lobo, et al.. A CRITERION FOR EVALUATION OF THE VALIDITY OF BLACK CARBON REFRACTIVE INDEX FROM MEASUREMENTS OF LIGHT ABSORPTION IN THE VISIBLE AND NEAR-INFRARED. 9th International Symposium on Radiative Transfer, RAD - 19, Jun 2019, Athens, Greece. ⟨hal-02288121⟩

Partager

Métriques

Consultations de la notice

8