Measuring black carbon spectral extinction in the visible and infrared
Measuring black carbon spectral extinction in the visible and infrared
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DOI：
10.1002/2015jd023564
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发表时间：
2015-09
期刊：
影响因子：
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通讯作者：
A. Smith;D. Peters;R. McPheat;S. Lukanihins;R. Grainger
中科院分区：
文献类型：
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作者：
A. Smith;D. Peters;R. McPheat;S. Lukanihins;R. Grainger
这项工作介绍了 400 nm 至 15 μm 黑碳气溶胶光谱消光的测量结果。使用微型燃烧气溶胶标准烟灰发生器产生气溶胶，然后使其在气溶胶池中循环，在气溶胶池中使用可见光光栅光谱仪和红外光傅里叶变换光谱仪测量其消光。使用单颗粒气溶胶采样器还获得了尺寸分布、数量浓度和质量消光截面。发现 550 nm 处的平均质量消光截面为 8.3 ± 1.6 m2 g−1，假设合理的单散射反照率为 0.2，则对应于 6.6 ± 1.3 m2 g−1 的质量吸收截面。这与之前报道的文献值相吻合。对颗粒电子显微镜图像的计算机分析可以独立确认黑碳气溶胶的尺寸分布和分形参数。这项工作中提出的气溶胶特性代表了非常新鲜的、未涂层的黑碳气溶胶。对此类气溶胶进行大气处理（可能包括与其他成分混合和结构变化）后，预计会出现不同的光学特性。
This work presents measurements of the spectral extinction of black carbon aerosol from 400 nm to 15 μm. The aerosol was generated using a Miniature Combustion Aerosol Standard soot generator and then allowed to circulate in an aerosol cell where its extinction was measured using a grating spectrometer in the visible and a Fourier transform spectrometer in the infrared. Size distribution, number concentration, and mass extinction cross sections have also been obtained using single‐particle aerosol samplers. A mean mass extinction cross section at 550 nm of 8.3 ± 1.6 m2 g−1 is found which, assuming a reasonable single scatter albedo of 0.2, corresponds to a mass absorption cross section of 6.6 ± 1.3 m2 g−1. This compares well with previously reported literature values. Computer analysis of electron microscope images of the particles provides independent confirmation of the size distribution as well as fractal parameters of the black carbon aerosol. The aerosol properties presented in this work are representative of very fresh, uncoated black carbon aerosol. After atmospheric processing of such aerosols (which could include mixing with other constituents and structural changes), different optical properties would be expected.