Digital Commons @ Michigan Tech Digital Commons @ Michigan Tech Brown carbon in tar balls from smoldering biomass combustion Brown carbon in tar balls from smoldering biomass combustion
Digital Commons @ Michigan Tech Digital Commons @ Michigan Tech Brown carbon in tar balls from smoldering biomass combustion Brown carbon in tar balls from smoldering biomass combustion
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.我们报告的直接观察实验室生产的球形，碳质颗粒-“焦油球”-从阴燃燃烧两种常见的干燥中纬度燃料。对光谱变化的吸收λ-角系数（AAC）的实时测量表明，一类具有波长依赖性折射率虚部的光吸收有机碳（OC）-光学定义为“棕碳”-是焦油球的重要组成部分。它们的复折射率的虚部的光谱可以用类洛伦兹模型描述，其有效共振波长在紫外（UV）光谱区。敏感性计算包含（无吸收，紫外线和焦油的性质完全纳入强迫模型的紫外线光学在
. We report the direct observation of laboratory production of spherical, carbonaceous particles – “tar balls” – from smoldering combustion of two commonly occurring dry mid-latitude fuels. Real-time measurements of spectrally varying absorption ˚Angstr ¨ om coefficients (AAC) indicate that a class of light absorbing organic carbon (OC) with wavelength dependent imaginary part of its refractive index – optically defined as “brown carbon” – is an important component of tar balls. The spectrum of the imaginary parts of their complex refractive indices can be described with a Lorentzian-like model with an effective resonance wavelength in the ultraviolet (UV) spectral region. Sensitivity calculations for containing (no absorption at and UV and total inclusion of the properties of tar into forcing models optical of UV in the