Fengshan Liu, J. Yon, A. Fuentes, Joel C Corbin, P. Lobo, G. Smallwood
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引用次数: 0
摘要
燃烧系统和生物质燃烧排放的分形黑碳颗粒是短期污染物,对气候强迫有重大贡献。为了准确地量化未包覆和包覆黑碳(BC)粒子的作用力和解释光学测量结果,必须知道BC在可见光和近红外波段的折射率m = n + ki。本文首次采用广义mie -解方法(GMM)和离散偶极近似(DDA)研究了不同形态参数和结构缺陷对黑碳粒子质量吸收截面(MAC)的影响。对Rayleigh-Debye-Gans (RDG)近似的精度进行了评价。根据最近对烟尘吸收函数E(m)和新发射的BC MAC在可见光和近红外波段的测量,推荐了E(m)的最可能范围。基于n-k平面上的E(m)等高线图,提出了确定新发射BC有效折射率范围的判据。
A CRITERION FOR EVALUATION OF THE VALIDITY OF BLACK CARBON REFRACTIVE INDEX FROM MEASUREMENTS OF LIGHT ABSORPTION IN THE VISIBLE AND NEAR-INFRARED
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.