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首页> 外文期刊>Environmental Science & Technology >Night-Time Ground Hyperspectral Imaging for Urban-Scale Remote Sensing of Ambient PM-Modal Concentrations Retrieval
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Night-Time Ground Hyperspectral Imaging for Urban-Scale Remote Sensing of Ambient PM-Modal Concentrations Retrieval

机译：夜间地面高光谱成像，用于环境尺度PM-模态浓度反演的城市规模遥感

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摘要

Retrieval of aerosol loading in vertical atmospheric columns is a common product of satellite and ground instruments that measure spectral extinction of solar radiation throughout the entire atmosphere. Here we study ground hyperspectral imaging of artificial light sources as a complementary method for retrieving fine aerosol concentrations along quazi-horizontal ambient open paths. Previously, we reported hyperspectral measurements of the aerosol optical thickness in the 500-900 nm range over urban-scale distances (180 m to 4 km), measuring the extinction of radiation emitted from a halogen source. Here we confirm in a laboratory-setup the basic premise that different accumulation-size aerosols generate distinct hyperspectral signatures in this spectral range. Measured hyperspectral attenuation signatures of fine aerosols were comparable to calculated Mie scattering signatures, suggesting that modal aerosol concentrations can be retrieved. A genetic algorithm was adapted to estimate the aerosol modal concentrations from its hyperspectral extinction signature. Retrievals of aerosol concentrations from measured and synthetic hyperspectral signatures indicated a robust algorithm, with an expected retrieval error of 0.2-22% for typical ambient concentrations along an urban-scale open path. The retrieval accuracy was found to depend on the relative aerosol modal concentrations, especially when there is a substantial overlap between the modal spectral signatures.
机译：垂直大气柱中气溶胶负荷的检索是卫星和地面仪器的常见产品，这些仪器可测量整个大气中太阳辐射的光谱消光。在这里，我们研究人造光源的地面高光谱成像，作为沿着准水平环境开放路径检索细小气溶胶浓度的补充方法。以前，我们报道了在城市范围距离（180 m至4 km）内500-900 nm范围内的气溶胶光学厚度的高光谱测量，用于测量卤素源发出的辐射的消光。在这里，我们在实验室设置中确认了基本前提，即在此光谱范围内，不同累积大小的气溶胶会产生不同的高光谱特征。测得的细小气溶胶的高光谱衰减特征与计算的Mie散射特征相当，表明可以获取模态气溶胶浓度。遗传算法适用于根据其高光谱消光特征估算气溶胶模式浓度。从实测和合成的高光谱特征中提取气溶胶浓度表明了一种鲁棒的算法，对于沿城市规模开放路径的典型环境浓度，预期的提取误差为0.2-22％。发现检索精度取决于相对气溶胶模式浓度，尤其是当模式光谱特征之间存在实质重叠时。

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  • 来源
    《Environmental Science & Technology》 |2014年第3期|1787-1794|共8页
  • 作者

    Yael Etzion; Tsafrir Kolatt; Maxim Shoshany; David M. Broday;

  • 作者单位

    Civil and Environmental Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel;

    IIAR-The Israeli Institute for Advanced Research, Rehovot 76100, Israel;

    Civil and Environmental Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel;

    Civil and Environmental Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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