摘要翻译：
夜间人造光已经影响了世界范围内大部分的自然夜间景观，随之而来的光污染对动植物和人类福祉产生了不同的影响。为了评估光污染对环境的影响，了解所有天气条件下夜间光的自然成分和人工成分是至关重要的。对于晴朗天空的夜空亮度是比较清楚的，并定义了下限的参考点。然而，对于多云的天空来说，没有这样的参考点。虽然一些研究检查了城市地区的云对夜空的增亮，但关于云（自然）变暗的公开数据非常少。然而，了解自然夜间环境照明的参考点，对于评估光污染影响的实验设计和生态建模是必不可少的。在这里，我们使用差分全天空测光与商业数码相机，以调查云如何黑暗天空亮度在两个农村地区。空间分辨率的数据使我们能够识别和研究几乎没有污染的天空部分，并在没有光污染的地方为阴夜的地面照明设定上限。
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英文标题：
《Using all-sky differential photometry to investigate how nocturnal
  clouds darken the night sky in rural areas》
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作者：
Andreas Jechow, Franz H\"olker, Christopher C. M. Kyba
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最新提交年份：
2020
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分类信息：

一级分类：Physics        物理学
二级分类：Instrumentation and Methods for Astrophysics        天体物理学仪器和方法
分类描述：Detector and telescope design, experiment proposals. Laboratory Astrophysics. Methods for data analysis, statistical methods. Software, database design
探测器和望远镜设计，实验建议。实验室天体物理学。资料分析方法，统计方法。软件，数据库设计
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一级分类：Quantitative Biology        数量生物学
二级分类：Other Quantitative Biology        其他定量生物学
分类描述：Work in quantitative biology that does not fit into the other q-bio classifications
不适合其他q-bio分类的定量生物学工作
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英文摘要：
  Artificial light at night has affected most of the natural nocturnal landscapes worldwide and the subsequent light pollution has diverse effects on flora, fauna and human well-being. To evaluate the environmental impacts of light pollution, it is crucial to understand both the natural and artificial components of light at night under all weather conditions. The night sky brightness for clear skies is relatively well understood and a reference point for a lower limit is defined. However, no such reference point exists for cloudy skies. While some studies have examined the brightening of the night sky by clouds in urban areas, the published data on the (natural) darkening by clouds is very sparse. Knowledge of reference points for the illumination of natural nocturnal environments however, is essential for experimental design and ecological modeling to assess the impacts of light pollution. Here we use differential all-sky photometry with a commercial digital camera to investigate how clouds darken sky brightness at two rural sites. The spatially resolved data enables us to identify and study the nearly unpolluted parts of the sky and to set an upper limit on ground illumination for overcast nights at sites without light pollution.
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PDF链接：
https://arxiv.org/pdf/1807.10593