Spectral dependence of visible light absorption by carbonaceous particles emitted from coal combustion
Spectral dependence of visible light absorption by carbonaceous particles emitted from coal combustion
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DOI：
10.1029/2001gl013652
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发表时间：
2001-11-01
影响因子：
5.2
通讯作者：
Bond, TC
中科院分区：
文献类型：
--
作者：
Bond, TC
需要吸收可见光的粒子的光学特性来模拟它们对大气辐射的影响。低技术煤燃烧排放的颗粒的光吸收表现出很强的光谱依赖性。我调查这种现象的各种解释，并得出结论，光谱依赖虚折射率是最合理的。根据以前对无定形碳结构的研究，我提出光吸收的幅度和光谱依赖性都受材料内石墨簇的大小控制，并且可以使用光学带隙理论来描述。这一假设是对目前光吸收“黑碳”和非吸收“有机碳”的测量划分的替代，并提供了对可能延伸到紫外线波长的蓝色波长的优先吸收的解释。
Optical characteristics of particles that absorb visible light are needed to model their effects on atmospheric radiation. Light absorption by particles emitted from low-technology coal combustion has exhibited a strong spectral dependence. I investigate various explanations for this phenomenon and conclude that a spectrally dependent imaginary refractive index is the most plausible. Following previous work on the structure of amorphous carbon, I propose that both the magnitude and spectral dependence of light absorption axe controlled by the size of graphitic clusters within the material, and can be described using the optical band-gap theory. This hypothesis is an alternative to the current measurement divisions of light-absorbing "black carbon" and non-absorbing "organic carbon," and offers an explanation for preferential absorption at blue wavelengths that may extend to ultraviolet wavelengths.