散射辐射对城市向上辐射的贡献

IF 2.3 3区 物理与天体物理 Q2 OPTICS Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2024-12-26 DOI:10.1016/j.jqsrt.2024.109330
Jaromír Petržala, Ladislav Kómar
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引用次数: 0

摘要

城市夜间光辐射遥感已成为光污染建模的重要组成部分。通过扫描地球表面的各种卫星收集的辐射数据是估计城市向上光通量的重要输入,从而可以评估其周围环境的光污染水平。最简单的方法是假设城市像素的测量亮度属于其直接辐射。然而,这种辐射被来自像素周围发光环境的散射辐射“污染”了。原则上,这种漫射光的贡献可以影响发射通量的估计。在本文中,我们开发了一个模型来评估这种贡献对不同形状和规模的城市的重要性。VIIRS-DNB数据库对真实城市模式的数值模拟表明,在相当明显的气溶胶条件下,散射辐射平均可占一个像元向上总辐射的10%-20%左右。我们还推导了两个理想化城市模式的简化模型,可以相对简单地估计漫射辐射的贡献,而不需要对现实城市进行复杂的模拟。
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The contribution of scattered radiation to the upward radiance of a city
Remote sensing of nighttime urban light emissions becomes a common part of light pollution modeling. Radiance data gathered by various satellites scanning the Earth surface serve as important inputs for estimating the upward luminous flux of a city, which then allows to evaluate the level of light pollution in its surroundings. The easiest way is to assume the measured radiance of a city pixel as belonging to its direct radiation. However, this radiance is ”contaminated” by scattered radiation coming from the light emitting surroundings of the pixel. In principle, this diffuse light contribution can influence the estimate of the emitted flux. In this paper, we developed a model to assess how important such a contribution can be for cities of different shapes and sizes. The numerical simulations for real city patterns obtained from the VIIRS-DNB database reveal, that scattered radiation could make up on average about 10%–20% of the total upward radiance of a pixel under quite obvious aerosol conditions. We have also derived two simplified models for idealized city patterns which enable relatively simple estimation of the diffuse radiation contribution without the need of complex simulations for realistic cities.
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来源期刊
CiteScore
5.30
自引率
21.70%
发文量
273
审稿时长
58 days
期刊介绍: Papers with the following subject areas are suitable for publication in the Journal of Quantitative Spectroscopy and Radiative Transfer: - Theoretical and experimental aspects of the spectra of atoms, molecules, ions, and plasmas. - Spectral lineshape studies including models and computational algorithms. - Atmospheric spectroscopy. - Theoretical and experimental aspects of light scattering. - Application of light scattering in particle characterization and remote sensing. - Application of light scattering in biological sciences and medicine. - Radiative transfer in absorbing, emitting, and scattering media. - Radiative transfer in stochastic media.
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